Editing Boo

{{about|the ghost enemies that appear throughout the [[Mario (franchise)|''Mario'' franchise]]|the [[microgame]] from [[WarioWare: D.I.Y. Showcase]]|[[Boo (microgame)]]|the area in Mario Party 10|[[Boo (area)]]}}
{{Species-infobox
|title=Boo
|expand=expandable
|image=[[File:Boo_CTTT.png|200px]]<br>A Boo in ''[[Captain Toad: Treasure Tracker]]''
|derived_species=[[Big & Little Boo]]<br>[[Big Boo]]<br>[[Black Boo]]<br>[[Blindfold Boo]]<br>[[Bomb Boo]]<br>[[Boo Balloon]]<br>[[Boo Block]]<br>[[Boo Buddy Snake]]<br>[[Boo Buddy Swarm]]<br>[[Boo Stack]]<br>[[Bowser Memory Boo]]<br>[[Circling Boo Buddies]]<br>[[Dark Boo]]<br>[[Disappearing Boo Buddy]]<br>[[Eerie]]<br>[[Frame Boo]]<br>[[Gold Boo]]<br>[[Green Boo]]<br>[[Jelly Ghost]]<br>[[Li'l Boo]]<br>[[Mad Boo]]<br>[[Mini Boos]]<br>[[Octoboo]]<br>[[Paper Boo]]<br>[[Peepa]]<br>[[Red Boo]]<br>[[Sleepy Boo]]<br>[[Stretch (Boo)|Stretch]]<br>[[Tail Boo]]<br>[[Terekuribō]]
|related=[[Boo Guy]]<br>[[Fishing Boo]]
|notable=[[Big Boo (boss)]]<br>[[Boo (Mario Party Advance)|Boo (''Mario Party Advance'')]]<br>[[Boolossus]]<br>[[Bootler]]<br>[[Captain Boo]]<br>[[The Creepy Steeple Boo]]<br>[[Franky]]<br>[[Herbert]]<br>[[Igor]]<br>[[King Boo]]<br>[[King Boo (Super Mario Sunshine)|King Boo (''Super Mario Sunshine'')]]<br>[[Lady Bow]]<br>[[Lahla]]<br>[[List of Boos in Luigi's Mansion|''Luigi's Mansion'' Boos]]<br>[[List of Boos in Luigi's Mansion: Dark Moon|''Luigi's Mansion: Dark Moon'' Boos]]<br>[[Peeka]]<br>[[Phantom (boss)|Phantom]]<br>[[Stanley (Paper Mario)|Stanley]]<br>[[Spooky Speedster]]
|first_appearance=''[[Super Mario Bros. 3]]'' ([[List of games by date#1988|1988]])
|latest_appearance=''[[New Super Mario Bros. U Deluxe]]'' ([[List of games by date#2019|2019]])
}}
{{quote2|Mind turning around for a minute?|Boo|[[Paper Mario: Color Splash]]}}

'''Boos''' (originally known as '''“Boo” Diddlys'''<ref>''Super Mario Bros. 3'' English instruction booklet, page 38.</ref> and later '''Boo Buddies'''<ref>''Super Mario World'' English instruction booklet, page 24.</ref><ref>''Yoshi'' instruction booklet, pages 5 and 12 on NES and pages 4 and 11 on Game Boy.</ref><ref>''Super Mario World 2: Yoshi's Island'' Nintendo Player's Guide. [[media:SMW2 Guide 126.jpg|Page 126]].</ref>) are common ghost enemies in the [[Mario (franchise)|''Mario'' franchise]] that first appear in ''[[Super Mario Bros. 3]]''. They are a type of white, spherical ghost with menacing and normally open mouths. They are known for their large tongues and small "arms" of some sort. However, the most distinctive characteristic of the Boos is their shy personality, where they cover their faces when someone looks them directly at the face. They will uncover their faces once the subject turns around. [[Goombario]]'s [[tattle]] for the Boo [[Igor]] in ''[[Paper Mario]]'' states: ''"He probably was a merchant before he became a Boo,"'' implying that current Boos may have once been living beings. It is revealed in ''[[Super Mario Galaxy]]'' that they speak in Booish.

==History==
===''Super Mario'' series===
====''Super Mario Bros. 3''====
[[File:LookinAtBoo.png|thumb|Mario encounters a Boo in World 8-1]]
[[File:SMB3Boo.jpg|thumb|left|A Boo from ''Super Mario Bros. 3'']]
Boos first appear in ''[[Super Mario Bros. 3]]''. Here, they are referred to as “Boo” Diddlys, a pun off the late rock star {{wp|Bo Diddley}}. However, future games refer to them only as Boos. They make their first appearance in the [[Desert Land]] fortress. The Boo shields its face if [[Mario]] or [[Luigi]] look at it, but it starts to chase Mario or Luigi if they look away. Boos are unable to be defeated unless the two are equipped with a [[Hammer Suit]], [[Green Shell|Koopa shell]], or [[Super Star|Starman]]. The game also has [[Stretch (Boo)|Stretch]]es, which are Boos with very long bodies that live in the Fortresses throughout the [[Mushroom World]].
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====''Super Mario World''====
[[File:SMWBoo.png|frame]]
In ''[[Super Mario World]]'', Boos are called '''Boo Buddies''', and they reside in the many Ghost Houses in the game. These Boos retain their usual pattern of attack from ''Super Mario Bros. 3'' and sometimes make faces at Mario or Luigi. However, they are somewhat slower and less accurate than in ''Super Mario Bros. 3''. This game also introduces many new Boo variations, such as the [[Boo Block]], [[Boo Buddy Snake]], [[Boo Buddy Swarm]], [[Circling Boo Buddies]], [[Eerie]]s, and [[Disappearing Boo Buddy|Disappearing Boo Buddies]]. It also introduces a giant version of the Boo, the [[Big Boo]], and a [[Lakitu]]-like ghost called a [[Fishing Boo]]. One Ghost House contains a secret boss, a special [[Big Boo (boss)|Big Boo]]. The only way to defeat a Boo is with Super Stars or with Grab Blocks when it is visible. Unlike later games, the Boos in this game seem to have multiple tails. The groups of Boos also have different facial expressions, while individual Boos change theirs for a brief second if left alone for a while.

====''Super Mario Land 2: 6 Golden Coins''====
[[File:Boosprite.PNG|frame|left]]
Boos appear in ''[[Super Mario Land 2: 6 Golden Coins]]''. These Boos are relatively unchanged from the previous Boos from ''[[Super Mario Bros. 3]]''. Boos in this game are found in the [[Pumpkin Zone]]. A thrown [[Green Shell]] can defeat it. A new sub-species named [[Terekuribo]]s, which are a species of undead Goombas, also appears in this game.

====''Super Mario 64'' / ''Super Mario 64 DS''====
[[File:Boo 64.png|thumb|120px|left|A Boo in ''Super Mario 64'']]
[[File:SM64DS_BigBoo.png|thumb|175px|A Boo in ''Super Mario 64 DS'']]
Boos make a starring appearance in the course [[Big Boo's Haunt]] in ''[[Super Mario 64]]''. A group of Boos can be found in the Castle Gardens (eight of which are holding [[Red Coin]]s in the ''DS'' version). After collecting twelve [[Power Star]]s, Mario is able to enter Big Boo's Haunt by going into the little cage that a certain Boo drops; this Boo will be somewhat bigger than the others. He also battles Big Boo three times here. Additionally, when Mario looks at the Boos, they attempt to hide by becoming partially transparent, but if Mario is not looking at them, they chase him. If they hit him, he loses two wedges of health. In the translucent Boo, the player can see a [[Coin]] or a [[Blue Coin]]. To defeat them, a punch or kick from behind or the side is needed. They can also be defeated with a [[Ground Pound]] while he is not looking at them. When defeated they give a Blue Coin, but the ones in the Castle Gardens give a normal Coin instead. When defeated in the first mission, "Go On A Ghost Hunt", the Boos will say, "Ghosts... ...don't... ...DIE! Heh, heh, heh! Can you get out of here... ...alive?" when defeated. In addition, a Boo will appear in the hallway of [[Peach's Castle]] after twelve Stars are collected. Interestingly, their laugh is actually [[Bowser]]'s laugh sped up.

In ''[[Super Mario 64 DS]]'', eight stars are needed to spawn a small Boo in the hallway, who holds a red coin. After fifteen stars are collected, the small Boo is replaced by a Big Boo, which then allows Mario to enter Big Boo's Haunt. Sometimes, if the player is not Luigi, one particular Boo will wear a Luigi cap. In the haunt, Mario can find a Luigi painting, which will take him to the [[Big Boo Battle]] level on the balcony. After reaching the end by following the cackle of [[King Boo]], he makes it to a room with a mirror at the end of it. He then has to battle King Boo. However, King Boo is invisible, and the only way for Mario to see it is by looking in the mirror, making it harder to hit King Boo. After hitting it three times, Mario gains the key to the room in which Luigi is imprisoned and proceeds to free him. In the English version of the game, King Boo is incorrectly referred to as "Big Boo." Yoshi cannot defeat Boos in this game. Ground Pounding yields no results, and eating them simply causes Yoshi to spit them back out. Fortunately, Mario, Luigi, or Wario can hit Boos with ground pounds.

====''Super Mario Bros. Deluxe''====
[[File:You_vs._Boo.PNG|frame|The Boos from ''Super Mario Bros. Deluxe'', arranged by speed]]
While Boos do not appear in the original ''[[Super Mario Bros.]]'', Boos appear in ''[[Super Mario Bros. Deluxe]]'' as the main enemy in the "You VS. Boo" mode. The goal is to reach the [[flagpole]] before the Boo. After defeating Boo within a certain time frame, it flies away, and a [[Green Boo]] replaces it. After that Boo is defeated, a [[Red Boo]] takes its place, and finally, a Black Boo with a yellow outline appears. Each new Boo is faster than the one before it, meaning the plain White Boo is the slowest, while the Black Boo is the fastest and hardest to defeat.

====''Super Mario Sunshine''====
[[File:booshine.jpeg|thumb|left|A Boo from ''[[Super Mario Sunshine]]'']]
Boos return in ''[[Super Mario Sunshine]]'', terrorizing the residents of [[Hotel Delfino]]. In this game, they can be stunned by [[F.L.U.D.D.]] and defeated by being jumped on, making ''Super Mario Sunshine'' the only game outside of the ''Mario'' RPGs where jumping can defeat them. Boos in this game can also be eaten by Yoshi. They also disguise themselves as [[Yellow Coin]]s & [[Blue Coin]]s. Eventually, Mario finds [[King Boo (Super Mario Sunshine)|King Boo]] in the basement of the hotel's Casino, and he has to battle him. He can defeat him by throwing a [[Chili Pepper]] at him and then throwing another piece of [[fruit]] at him. Mario has to do this three times before King Boo is defeated. Boos can also disguise themselves as [[Shadow Mario]], while the real Shadow Mario runs from Mario. Like the other enemies, Boo's design is changed for this game, with drooping eyelids, blue circles surrounding their black pupils, and long, coiled tails. [[Red Boo|Pink Boo]]s also appear and can be turned into a platform if sprayed by F.L.U.D.D. Also appearing inside the hotel are a new species, known as [[Sleepy Boo]]s. These Boos mostly appear to block passages. F.L.U.D.D.'s water does not affect them; they can be removed only by being eaten by [[Yoshi]].
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====''New Super Mario Bros.''====
[[File:Booboo.gif|frame|left]]
Boos also appear in ''[[New Super Mario Bros.]]''. They are found mainly in Ghost Houses scattered throughout the game, as well as [[World 8-1 (New Super Mario Bros.)|World 8-1]]. They appear like they usually do, shy, and they act the same as in ''Super Mario Bros. 3''. They can only be defeated with a [[Shell]], a [[Super Star|Starman]], a [[Mega Mushroom]], or a [[Blue Shell]]. The game also introduces the [[Balloon Boo]], which are normal Boos who can suck up air, and become much bigger. [[Broozer]], the boxing ghost, first appears in this game as well. An icon of 2 Boos covers the progress map in Ghost Houses.

====''Super Mario Galaxy''==== 
[[File:Mario_Seek.png|thumb|200px|Mario looking at a Boo in ''Super Mario Galaxy'']]
Boos make an appearance in ''[[Super Mario Galaxy]]'' and can be found in the [[Ghostly Galaxy]], the [[Bigmouth Galaxy]], the [[Deep Dark Galaxy]], and the [[Sand Spiral Galaxy]]. Boos act the same way that they did in previous games, such as hiding by turning transparent when Mario looks at them and then following Mario when he looks away. Boos can be defeated only when they are brought under a ray of light (including the Toad Brigade captain's helmet and the light emitted from shells while in the water) or by [[Rainbow Mario]] touching them. The spin attack, however, can throw a Boo around Mario, knocking it off course temporarily or into a light. Boos can also be found underwater in the [[Bigmouth Galaxy]] where they attack just by swimming back and forth, similar to [[Cheep-Cheep]]s. In [[Deep Dark Galaxy]], in the secret mission, there is a Boo that has a [[Power Star]] in it. 

[[Boo Mario]] also appears in this game. Mario has the same look as the other Boos, but retains his face when in his Boo form. He also wears his trademark cap on his head. If a Boo spots Mario while he is a Boo, it develops an attraction for him and follows him. If a Boo hits Mario, Mario loses the powerup, but does not lose any health.

An individual Boo named [[Spooky Speedster]] is found in two areas of the game. Mario must race him twice to win a [[Power Star]]. He is raced once in the Ghostly Galaxy and once again in the [[Boo's Boneyard Galaxy]]. This game also introduces a new kind of Boo, called the [[Bomb Boo]]; it is similar to a normal Boo, but is black with yellow eyes and can be grabbed by its tongue if Mario uses his spin attack on it.

====''New Super Mario Bros. Wii''====
[[File:3-Ghost_Housensmbwii.PNG|200px|thumb|left|A Boo chasing Mario in ''New Super Mario Bros. Wii'']]
Boos reappear in ''[[New Super Mario Bros. Wii]]'' in ghost houses throughout the game. They behave the same way as they did in ''New Super Mario Bros'' and they are invincible, unless the player has a [[Super Star|Star]] power-up. [[Big Boo]]s also reappear along with [[Broozer]]s. [[Circling Boo Buddies]] can also be found in a small amount of ghost houses in the game. Despite their concept art, they appear with a blue glow as opposed to plain white in this game, giving off a more spectral appearance. In the level selection screen, a single Boo will be watching Mario, and will taunt Mario as he enters. If Mario gets tossed out, the Boo will laugh. However, once the level is beaten, the Boo will cover its face for the rest of the game.

====''Super Mario Galaxy 2''====
[[File:Boos and Big Boo SMG2.png|thumb|Boos alongside a [[Big Boo]] in the [[Haunty Halls Galaxy]] in ''Super Mario Galaxy 2'']]
Boos reappear in the game ''[[Super Mario Galaxy 2]]''. They behave the same way they did in its predecessor. They are found in haunted levels such as [[Haunty Halls Galaxy]] and [[Boo Moon Galaxy]]. The underwater Boos from the predecessor also appear in this game, in the [[Battle Belt Galaxy]] and [[Slimy Spring Galaxy]]. [[Bomb Boo]]s and [[Big Boo]]s also reappear.

====''Super Mario 3D Land''====
[[File:3DS_SuperMario_10_scrn10_E3.png|thumb|left|A Boo chasing [[Fire Mario]] in ''Super Mario 3D Land'']]
Boos later appear in ''[[Super Mario 3D Land]]''. In the game, they retain their normal battle strategy, which is chasing [[Mario]] when he looks away while sticking its tongue out. Boos in this game also momentarily disappear when hit with [[Fire Mario]]'s fireballs and [[Tanooki Mario]]'s tail whips. Boos also laugh in their original phonic from ''[[Super Mario 64]]''. Some Boos have Tanooki tails; these are called [[Tail Boo]]s. They act like normal Boos, but when they stop moving when Mario looks at them, they will swing their tails once, which can damage Mario. Big Boos also appear during the game. Another species of Boo is also introduced, called [[Peepa]]s. They do not act like normal Boos, instead moving around a set position, and do not halt when Mario looks at them, as in ''[[Super Mario Galaxy]]''.

====''New Super Mario Bros. 2''====
[[File:NSMB2-Ghost-Raccoon.png|thumb|Boos pushing the walls in ''New Super Mario Bros. 2'']]
Boos, along with [[Big Boo]]s, return in ''[[New Super Mario Bros. 2]]'', with the same appearance and behavior as in ''New Super Mario Bros. Wii'', except they turn completely red when Mario faces them. They can be found in Ghost Houses along with other ghost enemies such as [[Peepa]]s and the new [[Boohemoth]]. All of these varieties, save for Boohemoth, can be defeated with a Star or [[Gold Flower]]. Boos can also be turned [[Gold Boo]]s with a [[Gold Ring]]. When gold, Boos float away from Mario, leaving a trail of coins behind them.

There are also Boos that push walls in a [[Ghost House]], namely World 4's [[World 4-Ghost House (New Super Mario Bros. 2)|Ghost House]]. Here they push the wall either left or right and they do not stop when Mario looks at them.

====''New Super Mario Bros. U''====
[[File:BooNSMBU.png|thumb|left|Artwork from ''New Super Mario Bros. U'']]
Boos, [[Big Boo]]s, and [[Circling Boo Buddies]] appear in the [[Wii U]] title ''[[New Super Mario Bros. U]]''. Their behavior is the same as that of past installments. Boos also have their own [[Enemy Course]] in the [[Soda Jungle#Haunted Area|haunted area]] of the [[Soda Jungle]], where a group of Boos appear in an area with various [[Donut Lift]]s, and defeating them must occupy the [[Super Star]] located inside a [[Flying Question Block]]. They can also be defeated with a [[Baby Yoshi]].

====''Super Mario 3D World''====
[[File:BooSM3DW.jpg|thumb|150px|Boos in ''Super Mario 3D World'']]
Boos appear in ''[[Super Mario 3D World]]'', along with [[Peepa|Peepas]] and [[Big Boos]]. They retain the same strategy from ''Super Mario 3D Land'' and utter the same laugh from ''Super Mario 64''. They appear to be a bit more transparent than in previous mainstream ''Mario'' games and give out a blueish glow like in the ''New Super Mario Bros.'' games, as well as a reddish glow and even steam when Mario faces them.

====''Super Mario Maker'' / ''Super Mario Maker for Nintendo 3DS''====
{{multiple image
|align=left
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|footer=''Super Mario Bros.'' styled Boos from ''Super Mario Maker''
|image1=SMM-SMB-Boo.png
|width1=60
|image2=SMM-SMB-Boo-Hiding.png
|width2=60
|image3=SMM-SMB-Boo-Wings.png
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Boos reappear in ''[[Super Mario Maker]]'' and ''[[Super Mario Maker for Nintendo 3DS]]'' as enemies. They function the same as previous games. In the Course Maker, they can be placed as enemies, and can be shaken to turn into Circling Boo Buddies. They can also be dragged onto a platform, turning them into [[Stretch (Boo)|Stretches]]. Like many enemies, they can be enlarged by a [[Super Mushroom]] and be given wings, which the former will turn it into a Big Boo, and the latter will make them move much faster. They can be placed in [[Warp Pipe]]s, [[Bill Blaster]]s, [[Block]]s, and [[Track (object)|track]]s. In addition, adding Wings to a Boo Buddy will make the Boo Buddy move in and out.

====''Super Mario Run''====
[[File:SMRBoohind Lock and Key.png|thumb|left|A Boo holding a Color Coin from ''Super Mario Run'']]
[[File:SMRBoo.png|frame|right]]
Boos appear in ''[[Super Mario Run]]'' in Ghost House levels. When Mario looks at them, they cover their eyes, and also float up and down. They attack Mario by quickly following behind him. Mario can defeat them by backflipping over them. In some levels, pressing the pink [[P Switch]] defeats Boos on-screen. They can drop [[Key]]s, [[Coin]]s, or [[Color coin]]s after they are defeated, and the object they contain inside of them can slightly be seen through them before they are defeated. In [[Dark and Stormy]], Boos are defeated when a lightning strike occurs. Stretches also appear in the game.

====''Super Mario Odyssey''====
Boos do not appear physically in ''[[Super Mario Odyssey]]'', marking the first ''Super Mario'' game to not contain Boos since ''[[Super Mario Land]]''. However, [[Princess Peach|Peach]] wears a Boo mask on the side of her head when she visits [[Bowser's Kingdom]], a common way to wear masks of ''{{wp|yōkai}}'' in festivals in Japan.
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===DIC cartoons===
====''The Adventures of Super Mario Bros. 3''====
[[File:CartoonBoo.jpg|thumb|A Boo in ''[[The Adventures of Super Mario Bros. 3]]'']]
Boos make infrequent appearances in ''[[The Adventures of Super Mario Bros. 3]]'' television series, which depicts them as having a somewhat menacing appearance. Like in the game the show is based on, Boos work for Bowser and often aid him in causing trouble. An example of this is seen in the episode "[[Reign Storm]]", in which Bowser has several Boos terrorize the new Mushroom Shopping Mall. In this episode they are referred to as "Boo Diddlys".

====''Super Mario World'' television series====
[[File:aboo.jpg|thumb|left|A Boo in the ''Super Mario World'' television series]]
In ''[[Super Mario World (television series)|Super Mario World]]'', Boos, who are completely redesigned, appear in the episodes "[[Ghosts 'R' Us]]", in which a gang of Boos, as well as a Big Boo, appear to chase [[Yoshi]] through [[Wizenheimer's Haunted House]]; "[[The Night Before Cave Christmas]]", where they scare Yoshi away; and "[[The Yoshi Shuffle]]", in which several Boos appear in the audience during the episode. They are never referred to by name, instead simply being referred to as "ghosts".
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===''Nintendo Adventure Books''===
[[File:Capers.jpg|thumb|Boos chasing Luigi on the front cover of [[Koopa Capers]], the fourth of the ''Nintendo Adventure Books'']]
In ''[[Koopa Capers]]'', a Boo confronts Luigi if he decides to simply look through a keyhole in a fortress door, instead of barging through it. If Luigi decides to run away from it immediately, he will successfully escape, but if he decides to stand his ground, the Boo will chase him onto some floating blocks after he dodges its attack. Making a beeline for the door after mounting the blocks will allow the Boo to catch Luigi, but doing evasive techniques will allow him to escape it. When he begins his descent into the Magma Pit, Luigi will hear a Boo behind him, which causes him to pick up the pace, and escape it.

Illustrations of a Boo are used in puzzles in ''[[Dinosaur Dilemma]]'' and ''[[Flown the Koopa]]'', though none appear in the actual stories.

===''Super Mario World: Mario to Yoshi no Bōken Land''===
[[File:SMWM&YALBoos.png|thumb|left|Boos swarming Luigi, Yoshi, and Mario from ''Super Mario World: Mario to Yoshi no Bōken Land'']]
In the interactive OVA ''[[Super Mario World: Mario to Yoshi no Bōken Land]]'', Boos appear in a [[Ghost House]] that [[Mario]], [[Luigi]], and [[Yoshi]] are passing through. A Boo starts following Luigi, who is in the back, but every time he turns around, it disappears. Finally, he quickly does a double take, and turns just it time to see it re-materialize. He panics and Boos start swarming the group. Mario grabs a candle and lights it, which repels the Boos, and one drops a key they need to progress.
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===''Yoshi'' franchise===
====''Yoshi''====
[[File:BooY.jpg|thumb|left|100px|A Boo Buddy from ''Yoshi'']]
Boo Buddies make an appearance as one of the six falling objects in ''[[Yoshi (game)|Yoshi]]''. Boo Buddy's sprite in this game is similar to its sprite from ''[[Super Mario World]]''.

====''Yoshi's Cookie''====
In ''[[Yoshi's Cookie]]'', Boos return as enemies to [[Yoshi]]. Though in this game, they are depicted as one of Yoshi's "opponents". They are among the easy opponents, the others being [[Goomba]], [[Cheep Cheep]], [[Koopa Paratroopa|Paratroopa]], and [[Spiny]]. Two sub-species of Boos, [[Eerie]]s and [[Fishing Boo]]s appear, too. 

====''Yoshi's Safari''====
[[File:YoshiSafariBoo65.png|thumb|left|A Big Boo from ''Yoshi's Safari'']]
Boos<ref>''Yoshi no Road Hunting'' instruction booklet, page 21.</ref> (misnamed "Big Boo" in the English manual<ref>''Yoshi's Safari'' instruction booklet, page 20.</ref>) appear as enemies in ''[[Yoshi's Safari]]''. Their first and only appearance throughout the game is in [[Ghost Mansion]], a level in the [[Dark Realm]]. Unlike most enemies in the game that can be shot with the [[Super Scope]] to be defeated, shooting a Boo stops it in its tracks. While stunned, [[Yoshi]] can then run into it to defeat it. Defeating a Boo adds 500 points to the player's score (1,000 in Hard Mode), the highest amount of points earned from regular enemies. A [[Big Boo]] serves as the boss for the level.

====''Super Mario World 2: Yoshi's Island''====
[[File:YIBoo.png|frame]]
Boos also appear in ''[[Super Mario World 2: Yoshi's Island]]'' and its remake ''[[Yoshi's Island: Super Mario Advance 3]]'', where they are depicted with happy faces. They are first seen in World 2, which features numerous ghastly creatures. The only way to defeat Boos is by looking away and then make an egg bounce off a wall after it is thrown, hitting the ghost in the face. [[Kamek]] the [[Magikoopa]] turns one Big Boo into [[Bigger Boo]], which serves as a mini boss and grows in size every time he is hit by an egg. The main boss of World 2 is also a Boo-like creature, [[Roger the Potted Ghost]], who was a normal flower pot until Kamek made him giant and transformed it into a living creature. The game also features the [[Boo Balloon]], who are balloons made to look like Boos that yield items when they pop, as well as [[Blindfold Boo|Boo Man Bluff]], a blindfolded Boo that relies on the player's noise.

====''Yoshi's Story''====
[[File:Yoshis Story Boo.png|thumb|120px|A Boo in ''Yoshi's Story'']]
[[File:YSBooSprite.png|frame|left]]
Boos appear in ''[[Yoshi's Story]]'' in Stage 6-3: [[Ghost Castle]]. They do not act differently, although they are slightly bigger. The Ghost Castle is also home to other Boo species: namely, the [[Boo Block]], [[Blindfold Boo]], and [[Boo Buddy Swarm|Baby Boo]]s. Another variant, the [[Jelly Ghost]], inhabits the [[jelly]] of Stage 2-3: [[Jelly Pipe]] and Stage 2-4: [[Torrential Maze]]. The [[Big & Little Boo]] family also appear in Jelly Pipe.

The normal Boo<ref>[[Media:Yoshi Story Shogakukan P7.jpg|「ヨッシーストーリー 任天堂公式ガイドブック」 (''Yoshi's Story Nintendo Kōshiki Guidebook''), page 7.]]</ref> is mistakenly called a Big Boo<ref>''Yoshi's Story'' [[Nintendo Power#Player's Guides|Player's Guide]], pg. 10</ref> in the [[Nintendo Power]] guide.

====''Yoshi Topsy-Turvy''====
[[File:Boo YTT.png|frame|left]]
Boos appear again in ''[[Yoshi Topsy-Turvy]]''. In this game, they only appear in four missions. They follow the same tactics as normal, and are given their laugh from preceding releases.

====''Yoshi's Island DS''====
[[File:Boo Island DS.jpg|thumb|left|100px|Two Boos from ''Yoshi's Island DS'']]
Yoshi comes into contact with Boos, again, in ''[[Yoshi's Island DS]]''. Here, they are commonly found in castles, along with other ghastly creatures. Again, they work for Kamek. They attack the same as all Boos before, but like in ''Super Mario World 2: Yoshi's Island'', they can only be defeated if Yoshi looks away. So Yoshi must bounce an egg off of the wall into their face to defeat them. A Boo-like mid-boss, named [[Hector the Reflector]] appears as well. The Boos' laughs are used in many games before. It is used for the boss [[Six-Face Sal]], and even [[Baby Bowser]]. Their artwork depicts them like in the main series, but the in-game sprites are based on ''[[Super Mario World 2: Yoshi's Island]]''{{'}}s.

====''Yoshi's New Island''====
[[File:Beware the Boo Brigade.png|thumb]]
Boos return in ''[[Yoshi's New Island]]'', and act the same way as in past games. They first appear in World 2-4: [[Beware the Boo Brigade]]. [[Big Boo]]s also appear.
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===''Mario Kart'' series===
====''Super Mario Kart''====
[[File:SMKGhost.png|frame]]
Boos made their first appearance in the ''[[Mario Kart (series)|Mario Kart]]'' series, in ''[[Super Mario Kart]]''. Though not as obstacles, they only appear in [[Ghost Valley 1|the three]] [[Ghost Valley 2|Ghost Valley]] [[Ghost Valley 3|courses]]. In each race, they just laugh when the player drives by. They also appear as items, under the name, "Ghosts". When the player uses it, they will become transparent temporarily, while the "Ghost" steals the opposing player's item, if available. This item is only obtainable in "2 Player" mode.

====''Mario Kart 64''====
[[File:BooMK64.png|frame|left]]
Boos are used as an item, in ''[[Mario Kart 64]]''. When activated, the Boo selects a racer with the best item in reach, and steals the item and gives it to the player that released it. At the same time, the player obtains total invisibility and invincibility for a short period of time. While invisible, the player can pass the items, the course obstacles and the other racers more easily by simply going through them. If no other players have any items, the Boo will return empty handed. Boos also appear in [[Banshee Boardwalk]].

====''Mario Kart: Super Circuit''====
[[File:MKSCBoo.jpg|thumb|A Boo from ''Mario Kart: Super Circuit'']]
[[File:BrokenPier.png|thumb|left|Boos attacking [[Toad]] on Broken Pier from ''Mario Kart: Super Circuit'']]
Boos appear as items again in ''[[Mario Kart: Super Circuit]]''. When activated, they can also slow down the leading racer. Starting in this game, if a CPU racer uses a Boo, it can also steal items from the player and make the player lose Coins.

Boos also appear in two new courses, [[Boo Lake]] and [[Broken Pier]]. At Boo Lake, Boos hold candles which guide the player through the track. On Broken Pier, they attack the players and take their [[Coin]]s.

====''Mario Kart Arcade GP''====
Boos appear as items in the arcade game, ''[[Mario Kart Arcade GP]]''. A Boo appears as a basic item. It causes whoever is hit by it to slow down temporarily. There is also a new item called the '''Triple Boo'''. 

====''Mario Kart DS''====
[[File:BooMKDS.png|thumb|left|Boo item from ''Mario Kart DS'']]
In ''[[Mario Kart DS]]'', Boos reappear as items. The only differences are, they do not slow down the leading racer, and they no longer steal the best item in reach. Instead, they just steal the nearest racer's item. Also, using the Boo won't affect off-road racing, so various shortcuts can be made. Some pictures of Boos from the game, ''[[Luigi's Mansion]]'', appear in the [[Luigi's Mansion (place)#Mario Kart DS|Luigi's Mansion]] race course. [[Banshee Boardwalk]] reappears as a race, along with the Boos. They do not do anything that affects the racer; they just laugh when a racer drives by.

====''Mario Kart Arcade GP 2''====
[[File:YoshiPark2.png|thumb|Boos along with other [[Ghost (Luigi's Mansion series)|ghosts]] on the thumbnail for [[Yoshi Park 2]] from ''Mario Kart Arcade GP 2'']]
Boos reappear in the arcade game, ''[[Mario Kart Arcade GP 2]]''. Like what they do in ''Mario Kart Arcade GP'', they slow down the leading racer. Though, the Triple Boos do not appear in this game, even though it appears in the predecessor. However they do not appear in [[Mario Kart Arcade GP DX]].

====''Mario Kart Wii''====
[[File:Ghost Valley 2 MKWii.png|thumb|left|Boos from the track Ghost Valley 2 in ''Mario Kart Wii'']]
Boos do not appear as items in ''[[Mario Kart Wii]]'', but [[King Boo]] appears as a playable character. However, Boos do appear in a returning course, Ghost Valley 2. Like their original appearance in the track, Boos only laugh when racers drive by, but they eventually disappear. Boo also makes a cameo in Bowser's Castle. At the end of the track Boo's ''Mario Party 7'' artwork can be seen along with Dry Bones' artwork.

====''Mario Kart 7''====
[[File:MKTTC LM.png|thumb|Boos seen in the Luigi's Mansion track from ''Mario Kart 7'']]
In ''[[Mario Kart 7]]'', Boos appear in the returning track, [[Luigi's Mansion (DS)|Luigi's Mansion]], in place of the portrait ghosts. They will pop out of their paintings when the drivers race by them. They also appear as spectators on [[Toad Circuit]].

====''Mario Kart Arcade GP DX''====
[[File:MKAGPDX Boo.png|thumb|left|Boo item from ''Mario Kart Arcade GP DX'']]
In ''[[Mario Kart Arcade GP DX]]'', Boos return from ''Mario Kart Arcade GP 2'' as items.

====''Mario Kart 8'' / ''Mario Kart 8 Deluxe''====
[[File:Hammer Knight MK8D.jpg|thumb|A Boo inside a Hammer Knight from ''Mario Kart 8'']]
[[File:MK8D Image11.png|thumb|left|Luigi holding a Boo from ''Mario Kart 8 Deluxe'']]
In ''[[Mario Kart 8]]'', Boos appear as obstacles on [[Twisted Mansion]]. If aimed correctly, the players can land on the Boos floating around near the gliding section. They also possess [[Hammer Knight]]s near the end of the track.

In ''[[Mario Kart 8 Deluxe]]'', [[King Boo]] is again a playable character, and Boos can also be seen floating around on [[Luigi's Mansion (battle course)|<small>GCN</small> Luigi's Mansion]].

Boos also appear as items again, acting like they do in ''Mario Kart DS'', though the mechanics are slightly different. Unlike in that game, Boo users are still slowed down by off-road surfaces. Boos immediately steal an item from a random racer in front of the user, and invincible or other invisible players are not immune; the Boo will bring back a Mushroom if there is nothing to steal. The Boo is visible, both when it steals an item and when it gives the stolen item to the user. It takes a couple more seconds to deliver the item back to the player, however. Only one Boo can be in play at a time; once it brings back an item, another can appear in item boxes again, even while another player is still invisible. Lastly, due to the way deployed items work, a Boo is able to steal any timed or triple items, except for a [[Crazy Eight]], or a [[Piranha Plant (potted)|Potted Piranha Plant]] and Bullet Bill already in use. Doing so will always give the user a fresh version of the item.<ref>https://www.youtube.com/watch?v=OUdaqb7Cj2I</ref>
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===''Super Mario Adventures''===
In ''[[Super Mario Adventures]]'', a horde of Boos appear to attack Mario and Luigi when they are tricked into a haunted house by Bowser and the Koopalings. Mario and Luigi become trapped by the Boos and a Big Boo, who are held at bay by the bros staring at them in the face. Eventually, nearing exhaustion, Mario races to a nearby room, dragging Luigi while being chased by the Boos. Upon barging into this room, the Boos and Big Boo find Mario [[Dr. Mario|dressed as a psychiatrist]] with Luigi as his nurse. After some talking, Mario and Luigi manage to reform the Boos and the Big Boo, while learning they were bullied in their youth (which is why they act so nasty to everyone). These Boos and their Big Boo leader were last seen happily waving goodbye to Mario, Luigi and Yoshi as they left the haunted house, which the Boos led them out of.

Boos also make an appearance at Peach's wedding.
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===''Mario Bros.''===
[[File:MBSNES Boo.png|frame|left]]
Boos make an appearance in the ''[[Super Mario All-Stars]]'' remake of ''[[Mario Bros. (game)|Mario Bros.]]'', where they replace the green [[Fireball (Mario Bros.)|Fireball]]s.
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===''Hotel Mario''===
[[File:HM Boo.png|thumb|left|A Boo from ''Hotel Mario'']]
Boos also appear in the game ''[[Hotel Mario]]'' under the name '''Boo Buddies'''<ref>''Hotel Mario'' instruction book, page 16.</ref>. There are two types of Boos in this game. One type stays visible and does not hurt Mario until transparency is achieved, at which they can harm the heroic plumber. The other type of Boo uses the traditional attack method and turns invisible when looked at, and attacks Mario when his back is turned.
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===''Mario's Picross''===
Boos also make a cameo appearance in the [[Game Boy]] game, ''[[Mario's Picross]]''. They appear in one of the pictures in the "Early Picross" stage in level 6C. The other character that appears in the "Early Picross" stage is [[Mario]], who appears in level 6H. Like their first appearance, ''[[Super Mario Bros. 3]]'', they appear under the name '''Boo Diddly'''.
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===''Mario Clash''===
[[File:Big Boo Artwork - Mario Clash.png|thumb|left|Artwork of a Big Boo from ''Mario Clash'']]
Boos<ref>''Mario Clash'' Japanese instruction booklet, page 20.</ref> (misnamed "Big Boo" in the English manual<ref name=ClashBoo>''Mario Clash'' English instruction booklet, page 21.</ref>) make appearances in the [[Virtual Boy]] game, ''[[Mario Clash]]'', where they are among the nine enemies. In this game, Mario is able to attack a Boo from the side. Boos can become transparent by becoming dark like the screen, which causes them to become invulnerable, with [[Green Shell|shell]]s simply passing through. For some reason, the English manual also refers to the Boos using feminine pronouns, similar to [[Cheep Cheep]] in the original ''[[Super Mario Bros.]]''.<ref name=ClashBoo/>
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===''Super Mario RPG: Legend of the Seven Stars''===
[[File:Bigboo_SMRPG.gif|thumb|Artwork of The Big Boo from ''Super Mario RPG: Legend of the Seven Stars'']]
Boos return during the events of ''[[Super Mario RPG: Legend of the Seven Stars]]''. The English translation erroneously calls them "The Big Boo". In the Japanese version in fact they are just called Teresa. These Boos, like other Boos that appear in previous games, hide behind their arms when stared at. However, some of The Big Boos teleport around the room, attempting to scare Mario and his friends. The Big Boos live in [[Kero Sewers]] along with many other ghouls, including [[Hobgoblin]]s and [[Shadow]]s. Often, these three undead monsters will assist each other in battle. Big Boos have no physical defense, making them extremely weak enemies (even a [[Goomba]] has three defense points). However, The Big Boos make up for their lack of defense with high evasion, meaning that most attacks against a The Big Boo will miss. In battle, The Big Boos command powerful lightning magic, including the attacks [[Lightning Orb]] and [[Bolt (move)|Bolt]]. The Big Boos also know the special attack [[Scream]], which cuts a party member's [[fear|attack and defense in half]]. When not using magic, a The Big Boo will approach one of Mario's party members and make a face, damaging that character. In this game there is also a stronger Boo variation called [[Li'l Boo]]s, which are the same size as normal Boos but have blue tongues, similar to the first appearance of [[King Boo]]. The only true appearance of a Big Boo in this game is the one used in [[Bowser]]'s [[Terrorize]] attack <ref>As named in the ''Super Mario RPG: Legend of the Seven Stars'' manual.</ref>. One Big Boo lives in [[Monstro Town]] as part of the [[Three Musty Fears]], while another, simply named Boo, appears as part of one of [[Dr. Topper]]'s puzzles.
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===''Super Mario-Kun''===
[[File:Boo SuperMarioKun 8.jpg|thumb|Boo as it appears in ''Super Mario-Kun'']]
[[File:SMK25.jpg|thumb|left|Lady Bow as seen on the cover of ''Super Mario-Kun'' issue 25]]
Boos make appearances in some of the ''[[Super Mario-Kun]]'' comics. A Boo appears on the cover of the sixteenth issue. This issue is based on ''[[Super Mario 64]]''. Alongside it, [[Eyerok]], a [[Bob-omb]], and [[Bowser]] can be seen. Throughout the comic, they appear, too. Their role in the comic is similar to their role in the game, where they are enemies to Mario and attempt to attack him. [[Lady Bow]], a notable boo, appears in a couple of the ''[[Paper Mario]]'' based issues. These issues are 25 and 27. Lady Bow appears on the cover of the twenty-fifth issue along with many of [[Mario]]'s other partners, including [[Goombario]], [[Kooper]], [[Eldstar]], and [[Twink]]. Besides appearing on the cover, she appears throughout the comic. Her role in the comic mimics her role in the game. Lady Bow reappears on the cover of the twenty-seventh issue and in the comic. Like in issue 25, Lady Bow's role in the comic is similar to her appearance in the game, where she helps Mario. In a ''[[Super Mario Galaxy]]'' based issue, [[Boo Mario]] appears on the cover along with more of Mario's transformations.
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===''Game & Watch Gallery'' series===
====''Game & Watch Gallery 2''====
Boos (called 'Boo Buddies' in the Note Board) appear in the modern version of ''[[Vermin]]'' in ''[[Game & Watch Gallery 2]]''. When ''[[Yoshi]]'' looks in the general direction of them, they refuse to move. When Yoshi looks away, they move towards the eggs. They only appear in groups of two or just one.

====''Game & Watch Gallery 4''====
[[File:G&WG4BooSprite.png|frame]]
A Boo appears in the Modern version of ''[[Donkey Kong 3 (Game & Watch)|Donkey Kong 3]]'' and ''[[Mario's Cement Factory]]'' in ''[[Game & Watch Gallery 4]]''. In Donkey Kong 3, if Mario or Donkey Kong turn their backs, it'll slowly come closer to the player that it's closest to. If it gets close enough, the Boo will either scare Donkey Kong and award the player points (1 player only), or scare Mario and give the player a miss. In Mario's Cement Factory, a Boo will fly into the two containers on the second floor, clogging them up. The player does not receive any points for removing the Boo.
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===''Mario Party'' series===
Boo has been a major character in the ''Mario Party'' series, from being a thief for hire, to being a playable character.
====''Mario Party''====
[[File:CrazyCutter.png|thumb|left|Players cutting out Boos in Crazy Cutters from ''Mario Party'']]
Boos make minor appearances in ''[[Mario Party]]''. Their voices can be mimicked by one of the items: the [[Talking Parrot]]. Boos also appear in each of the game's board maps, excluding [[Peach's Birthday Cake]]. On the boards, they steal [[Coin]]s or [[Star (Mario Party series)|Stars]] from opponents, and they are willing to steal a few coins for free from any player, although they ask for 50 coins to steal a Star. If the player tells Boo that they don't want to steal anything, Boo will say ''Don't feel so guilty. Ha ha ha!'' Additionally, after the Luigi's Engine Room board is completed, a Boo, [[Koopa Troopa|Koopa]], and a [[Toad]], along with the two runner-ups, surround the victor and congratulate them. Boos also appear in several mini-games, including [[Pedal Power]] and [[Running of the Bulb]], and as one of the shapes the player can cut in the minigame, [[Crazy Cutter]].

====''Mario Party 2''====
[[File:DayAtTheRacesMP2.png|thumb|left|Boo in the minigame [[Day at the Races]] from ''Mario Party 2'']]
Boos make several appearances in ''[[Mario Party 2]]''. In it, they steal Coins or Stars as they did in the first game. However, Boo charges 5 coins to steal coins instead of a free steal; and steals much more than in the first game. Additionally, an item called the [[Boo Bell]] appears. When a player obtains it, they can ring for a Boo to come. The Boo that comes to the player's side is asked to steal Coins or Stars, depending on how much the player can afford. If the Boo is sent to steal Coins from an opponent, the opponent can fight it off by pressing the A button quickly. Additionally, the Boo can only steal a maximum of 30 coins or a maximum of one Star.

A Boo also appears in the battle minigame, [[Day at the Races]], along with the others racers, [[Whomp]], [[Thwomp]], and [[Bob-omb]]. The Boo can disappear and then reappear in a further spot on the racetrack. However, it gets its face stuck in the ground sometimes, causing it to stop for a short period of time.

====''Mario Party 3''====
[[File:CurtainCallMP3.png|thumb|Boos in [[Curtain Call]] from ''Mario Party 3'']]
Boos also appear in ''[[Mario Party 3]]''. Like in their previous appearances, they are not major characters in the game. They are among the Duel Partners in the [[Mario Party 3#Duel Mode Partners|Duel Mode Partners]]. It is [[Yoshi]]'s default partner, and when an opponent attacks, Boo can counterattack for equal damage, unless it was defeated by a [[Thwomp]]. Boo's attack is two, its health its one, and its salary is three coins.

Boos also appear in the unlockable party board, [[Waluigi's Island]]. Whenever a player runs into a Boo, it shows them to two paths. One of the paths is rigged. If the player chooses the rigged path, they are sent back to the start. If they choose the correct path, they continue on the board. In addition, Boos appear on all of the other boards, [[Chilly Waters]], [[Deep Bloober Sea]], [[Spiny Desert]], [[Woody Woods]], and [[Creepy Cavern]], serving the same function as in the previous games. On the board map, a picture of them can be seen next to a grave. They also return with the Boo Bell. Boos are also in the minigames [[Curtain Call]], [[Stacked Deck]], [[Three Door Monty]], and [[Crowd Cover]]. Two portraits of a Boo can also be seen in [[Locked Out]].

====''Mario Party 4''====
[[File: Booparty4.jpg|thumb|175px|left|The sorcerer Boo from ''Mario Party 4'']]
In ''[[Mario Party 4]]'', a Boo plays a major role as the host for [[Boo's Haunted Bash]]. This is the first game where the Boo uses its modern design. This Boo wears a wizard's cape, and like the other hosts in the game, it is the character to reward the player with a Star. Multiple Boos also appear on this board as background characters. One controls the Item Shop. Another one owns the [[Mystery Train]], but it only gives out rides to the Boneyard if a [[Red Boo]] is not in its presence. Two side-games involving Boos requires a [[Mini Mushroom]]. One of them has the player pressing one of the keys of the Horn of Plenty to get one of three randomly chosen items. The second one has the character on a piano. They have to press the correct key at the right time until the end of the side-game to get a certain amount of Coins. A question mark space activates a Boo clock. If three people land on them, Big Boo will appear. Big Boo is basically an upgraded version of the Boo House; he targets all players instead of one. The caped Boo is also the fourth host of the Reversal of Fortune, who oversees what is given.

Boos also appear on every other board in the game, stealing coins and Stars for the player at a shop called the Boo House in the same manner as Boos' previous appearances in the ''Mario Party'' series.

Also, a Boo is an unlockable, playable character in the Extra minigame, [[Beach Volley Folley]].

In [[Long Claw of the Law]], a Boo is one of the possible characters that needs to be collected.

====''Mario Party 5''====
[[File:Boo Artwork - Mario Party 5.png|thumb|125px|Boo from ''Mario Party 5'' playing [[Coney Island (minigame)|Coney Island]]]]
''[[Mario Party 5]]'' marks the first game in the ''Mario Party'' series where Boo is a playable character in Party Mode. He is one of the new characters, the others being [[Koopa Kid]] and [[Toad]]. Boo's partner in the game is [[Koopa Kid]]. Since Boo is playable, he does not make any major background appearances. His previous role on the boards is now fulfilled by [[Chain Chomp]].

====''Mario Party 6''====
[[File:MP6 Boo.jpg|thumb|left|Boo, along with some Red Boos, from ''Mario Party 6'']]
A Boo reappears as playable character in ''[[Mario Party 6]]''. In the game, there is also an orb called [[Boo Away Orb]], which protects the player from a [[Red Boo]]. Red Boos also appear in the minigame [[Boo'd Off the Stage]] and [[Boonanza!]]. Red Boos also appear two boards, [[Towering Treetop]] and [[Castaway Bay]] where they let players steal coins and stars from others at night, similar to the Boo House in ''Mario Party 4''. This game also marks the third appearance of Red Boos in the ''Mario Party'' series.

====''Mario Party Advance''====
[[File:MPAhorrorcondo2.png|thumb|Boos in the [[Horror Condo]] in ''Mario Party Advance'']]
Boos appear in ''[[Mario Party Advance]]'' as supporting characters. They appear in a few minigames, including [[Boo-Bye]]. In this minigame, regular Boos appear alongside Red Boos and Blue Boos. They also appear in [[Spooky Spike]], in which one Boo serves volleyballs to the player, [[Floor It!]], in which Boos are one of the possible passengers that must be brought to their respective floor, and [[Porta-Gust]], in which the player can suck up Boos into a vacuum.

One of them, [[Boo (Mario Party Advance)|Boo]], appears alongside some other Boos in the [[Boo Cemetery]], where they are main characters in the quest [[True-Blue Boo]].

====''Mario Party 7''====
[[File:Dry Bones and Boo Artwork - Mario Party 7.png|thumb|120px|Boo and Dry Bones from ''Mario Party 7''. This artwork is also found at ''Bowser's Castle'' in ''Mario Kart Wii''.]]
''[[Mario Party 7]]'' marks the third ''Mario Party'' game where Boo is playable. It also marks [[Dry Bones]]' first playable appearance, who is Boo's partner throughout the game. Red Boos appear in the game, too. Red Boos appear in a few minigames such as [[Ghost in the Hall]]. In this minigame, Red Boos try to scare the players. Oddly, the Red Boos also try to scare Boo, if Boo is one of the characters. Boo shares the same special orb with Dry Bones, the [[Magic Orb]]. It allows them to double their dice roll during the next two turns and turns them invisible, making them immune to traps.

====''Mario Party 8''====
[[File:BooMP8Official.png|thumb|left|Boo from ''Mario Party 8'']]
In ''[[Mario Party 8]]'', Boo is a playable character for the fourth time in the ''Mario Party'' series. Boo's partner is Dry Bones, again. Red Boos appear in some minigames such as [[Boo-ting Gallery]]. ''Mario Party 8'' also marks the first appearance of [[King Boo]], who is the board host of [[King Boo's Haunted Hideaway]]. In order to get a Star, the player must find the room King Boo is hiding in and give him ten coins. There are three rooms, two of which contain a trap hole. If the player finds one of these rooms, several Red Boos will throw them in, forcing the player to start back at the beginning. When the player gets a Star, King Boo will rearrange the mansion's rooms. Red Boos appear as owners of the item shops.

====''Mario Party DS''====
[[File:BooFigureMPDS.png|thumb|The Boo figure from ''Mario Party DS'']]
Boo is not a playable character in ''[[Mario Party DS]]'' and plays no part in board play, but appears as an unlockable figure. They also appear in the minigames [[Boo Tag]], and [[Peek-a-Boo (minigame)|Peek-a-Boo]]. In Boo Tag, a Boo tags a player. The tagged player must try to get rid of the Boo by running into another player. The player that spent the least amount of time with the Boo wins. In Peek-a-Boo, the players must find the wanted Boo. A lot of different Boos appear in outfits, such as hats. Several of the wanted Boo appear, and once they are all gone, the game is over. The team that won the most Boos wins.

====''Mario Party 9''====
[[File:Mp9 e.jpg|thumb|left|A Boo in ''Mario Party 9'']]
Boo does not return as a playable character in ''[[Mario Party 9]]'', however [[King Boo]] is the boss of [[Boo's Horror Castle]]. Normal Boos also appear on the board. When the player passes a Boo portrait, a Boo will emerge and chase after the player. These Boos will move three spaces after each turn, and if a Boo catches up to the players (or vice versa), the current captain will lose half of all of their [[Mini Star]]s.

During [[King Boo's Puzzle Attack]], whenever King Boo's health is depleted halfway, he sends Boos to attack the player. If the player's cursor touches a Boo, they are temporarily stunned. King Boo only sends one Boo at a time.

====''Mario Party: Island Tour''====
[[File:Boo Artwork (alt) - Mario Party Island Tour.png|thumb|left|Boo from ''Mario Party: Island Tour'']]
[[File:BooMPIT icon.png|frame]]
Boo returns as a playable character in ''[[Mario Party: Island Tour]]''. This is the fifth time that Boo is playable, the first time he is playable on a handheld ''Mario Party'' game, and he is the first character in the series to be removed as a playable character in a main installment of the series and then return in a later installment.

====''Mario Party 10''====
[[File:King Boo's Tricky Tiles MP10.png|thumb|left|Boss minigame [[King Boo's Tricky Tiles]] from ''Mario Party 10'']]
Boo reappears in ''[[Mario Party 10]]'' as a non-playable character. Whenever the player reaches [[Boo (area)|a certain spot]] in the board [[Haunted Trail]], Boo appears and steals five Mini Stars from a specific player for an indefinite number of turns. Boo will continue to harass the player until passed off to another player via a [[Boo Space]] or driven towards a [[Streetlight]]. Boos also appear in the minigame [[Boo Burglars]], as enemies the players must examine, and appear as a balloon in the minigame [[Balloon Blast Bash]]. Several Boos also make cameos in the [[Luigi Board]].
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====''Mario Party: Star Rush''====
[[File:Boo'sBlockParty amiibo.jpg|thumb|Boo's Block Party from ''Mario Party: Star Rush'']]
In ''[[Mario Party: Star Rush]]'' Boo has a special mode called Boo's Block Party. Players can participate in a single-player endless mode for a high score or compete in a one-on-one versus mode. When players use the Boo [[amiibo]] in Boo's Block Party, four Boos appears in the background; two on the top screen, two on the Touch Screen. If players tap the Boo amiibo in the Mario Shuffle mode, players can use Boo in that mode. They also appear in the [[Haunted Hallways]] and [[House of Boos]] minigames.
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====''Mario Party: The Top 100''====
In ''[[Mario Party: The Top 100]]'', Boo appears in minigames in [[Slot Trot]] from ''Mario Party 6'' and [[Jigsaw Jumble]] from ''Mario Party 9''. However, in Minigame Match, Boo appears as an item via [[Boo Bell]].

====''Super Mario Party''====
Boo returns as a playable character in ''[[Super Mario Party]]'', which is his sixth playable appearance in the ''Mario Party'' series.

===''Mario Golf'' series===
{{mgtt-infobox
|name=Boo
|image=[[File:ToadstoolTour Boo Mug.png]]
|drive=208 yards
|star_drive=253 yards
|trajectory=Slice
|height=3/5
|impact=13/21
|star_impact=09/21
|control=10/21
|spin=08/21
}}
Boos make a couple of appearances in the ''[[Mario Golf (series)|Mario Golf]]'' series. In ''[[Mario Golf (Nintendo 64)|Mario Golf]]'' and in ''[[Mario Golf: Toadstool Tour]]'' a Boo appears in the top right corner of the screen to indicate the speed and direction of the wind.

====''Mario Golf''====
[[File:Boovalley.jpg|thumb|left|Artwork of Boo Valley from ''Mario Golf'']]
In ''[[Mario Golf]]'' for the [[Nintendo 64]], Boos show where the wind blows by facing its direction in relation to the camera angle. They do not appear if there is no wind. Hole 2 of [[Mario's Star (golf course)|Mario's Star]] is designed after Boos. Also, Boos appear in one of the courses, [[Boo Valley]].

====''Mario Golf: Toadstool Tour''====
[[File:BirdieBoo.png|thumb|left|Boo getting a [[Birdie]] from ''Mario Golf: Toadstool Tour'']]
Boo is one of the unlockable characters in ''[[Mario Golf: Toadstool Tour]]'', the others being [[Bowser Jr.]], [[Shadow Mario]], and [[Petey Piranha]], and is the only unlockable character in this game that appeared in the opening clip. In [[Bowser Badlands]], Boos affect the trajectory of balls hit through them. Boos once again reprise their role of showing the wind direction, but they have another role; if a player delays in starting their swing, then two Boos carry a sign and float across the screen. These signs describe basic gameplay tips, but some are rather taunts to the player.

====''Mario Golf: World Tour''====
[[File:BooHoleInOne.jpg|thumb|Boo getting a [[Hole-in-One]] in ''Mario Golf: World Tour'']]
Boo returns in ''[[Mario Golf: World Tour]]'' as a playable character, this time being available from the start. Boos also appear in Hole 4 of [[Bowser's Castle (golf course)|Bowser's Castle]] floating in the sky alongside [[King Boo]]. For this installment, a "blowing cloud" is used instead of a Boo to indicate wind speed and direction.
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===''Mario Tennis'' series===
====''Mario Tennis'' (Nintendo 64)====
[[File:Mt64boo.png|thumb|120px|left|Boo from ''Mario Tennis'' (Nintendo 64)]]
Boo appears in ''[[Mario Tennis (Nintendo 64)|Mario Tennis]]'' for the [[Nintendo 64]], marking his first playable role. It is classified as a tricky character, the only other character of this class being [[Paratroopa]]. It is also a default character. Most of the playable characters have courts named after them. However, Boo does not have its own court.

====''Mario Tennis'' (Game Boy Color)====
[[File:Boo blast.png|thumb|A Boo in the minigame [[Boo Blast (minigame)|Boo Blast]] from ''Mario Tennis'' (Game Boy Color)]]
A Boo makes a cameo appearance in ''[[Mario Tennis (Game Boy Color)|Mario Tennis]]'' for the [[Game Boy Color]]. [[Princess Daisy]] and [[Toad]] also make cameo appearances. They can be seen in the audience at [[Peach's Castle]].

====''Mario Power Tennis''====
[[File:MPTBoo.PNG|thumb|135px|left|Boo from ''Mario Power Tennis'']]
Boo also appears in ''[[Mario Power Tennis]]'' where it is a playable character. When it wins a championship, Mario and Luigi would come out with the trophy and Boo would be missing. They look around and the trophy would start to float. Boo then appears under it to Luigi's relief as Mario laughs in amusement. The Mario Bros. themselves are then surrounded and levitated by multiple other Boos as the main Boo flies up to the screen and holds the trophy. Boo's taunt is to wave its racket while laughing. Boo's offensive power shot is the [[Boo Blast (Power Shot)|Boo Blast]] and its defensive power shot is the [[Boo Brigade Return]].

====''Mario Tennis Open''====
[[File:MTOBoo.jpg|100px|thumb|Boo in ''Mario Tennis Open'"]]
Boo reappears in ''[[Mario Tennis Open]]'', where he is again a playable and starting participant. He is one of the only two Tricky characters alongside [[Bowser Jr.]].

====''Mario Tennis: Ultra Smash''====
[[File:BooMTUS.jpg|thumb|left|Boo in ''Mario Tennis: Ultra Smash'']]
Boo appears in ''[[Mario Tennis: Ultra Smash]]'' as a default playable character. He is once again a Tricky character.

====''Mario Tennis Aces''====
[[File:MTA Models Boo.png|thumb|Boo from ''Mario Tennis Aces'']]
Boo returns as a playable character in ''[[Mario Tennis Aces]]''. Like in previous ''Mario Tennis'' games, Boo is classified as a Tricky character. His [[Trick Shot]]s are Roundabout and Through It All, while his [[Special Shot]] is Illusion. Boo also has unlockable alternate costumes, coming in the form of visors, that can be unlocked by playing the “Boo Hunt” co-op challenge. In this challenge the player must hit boos at the other side of the court to get coins. The visors came in Blue, Green and Purple and require 2,500 coins, 10,000 coins and 20,000 coins respectively.
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===''Paper Mario'' series===
Boos have appeared in every game in the ''[[Paper Mario (series)|Paper Mario]]'' series, where they are usually found in ghost houses, like in the other ''Mario'' games. In the first three ''Paper Mario'' games, the Boos appear with an original design.

====''Paper Mario''====
[[File:PM Boos Throwing the Record.png|thumb|Boos in [[Boo's Mansion]] from ''Paper Mario'']]
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Boos appear in ''[[Paper Mario]]'' as friendly but tricky characters. White Boos live in [[Boo's Mansion]], and yellow Boos live at [[Gusty Gulch]]. Their princess is [[Lady Bow]], who lives in Boo's Mansion along with [[Bootler]].

At first, Boos were being eaten by [[Tubba Blubba]]. Some Boos tried attacking the monster to save their friends, but they failed because of Tubba Blubba's "Invincibility". Seeking help from [[Mario]], they captured [[Skolar]], the Star Spirit Mario was trying to save in order to have Mario help them.

In the game, when [[Mario]] arrives at [[Boo's Mansion]], [[Bootler]] tells him to get to the third floor. Boos have prepared some puzzle for him under the order of [[Lady Bow]] to test him. One puzzle is for Boos to form a rotary circle, throw an item several times and ask Mario to guess who is holding the item. The first time he opens a door a big Boo appears on the screen. In the eastern room of the second floor Boos holding a [[Record (Paper Mario)|Record]] play this trick. In the western room of the second floor a Boo is guarding a chest box with a [[Weight]] in it. Mario plays the Record to lure the Boo away, and uses the Weight on the droplight of the mansion to open the western door on the first floor. Boos in the basement hide in a big chest box in the basement. When Mario opens the chest box, they play the puzzle with [[Super Boots]]. After Mario gets them, he is able to get [[Boo's Portrait]] with which he is able to get to the third floor. There, Lady Bow asks Mario to help the Boos to defeat Tubba Blubba as a condition to free Skolar, and joins Mario's party to assist him.

In addition, a Boo appears after Mario got the [[Super Boots]] and tells him how to get the [[Star Piece (Paper Mario)|Star Pieces]] underground. And some Boos are flying in the sky who can be seen out of the windows. When Mario is about to set off, two white Boos appears to open the gate to Gusty Gulch under the command of Bow.

In [[Gusty Gulch]], upon [[Tubba Blubba]]'s arrival, the Boos hide but [[Stanley (Paper Mario)|Stanley]] is late and is caught by Tubba Blubba, eaten.

In the basement of [[Tubba Blubba's Castle]], a yellow Boo tells [[Mario]] not to fight [[Tubba Blubba]] until he finds his weak point. According to his word, he sneaked into the castle to look for the weak point. After [[Mario]] gets [[Yakkey]], 3x2 peasant Boos appear in front of [[Tubba Blubba's Castle]] and, seeing Mario and [[Lady Bow|Bow]] get out and [[Tubba Blubba]] chasing, help the co by blocking the door.

After [[Tubba Blubba]] is defeated, the Boos he has eaten are saved, and Bootler releases Skolar as promised. Boos rejoice, and the background music in Boo's Mansion is replaced with a cheerful one. The Boos at [[Gusty Gulch]] write Lady Bow [[List of letters in Paper Mario#Boos in Gusty Gulch|an admiration letter]], which the player can read at the [[Post Office]] in [[Toad Town]]. They also begin to talk about a female Boo called [[Victoria]].

After Mario defeats [[Bowser]], two Boos come to [[Princess Peach's Castle]] to see the party, one white and one yellow. The white one says he comes to see [[Lady Bow]] in her finery. He thinks that Bow is prettier than [[Princess Peach]]. The yellow one says he's going to have a wedding ceremony after the party. In the end-of-game parade, three white Boos along with [[Bootler]] are carrying [[Tubba Blubba]]'s body.

====''Paper Mario: The Thousand-Year Door''====
[[File:PM2 Boo.PNG|frame|left]]
In the GameCube game ''[[Paper Mario: The Thousand-Year Door]]'', Boos are found in [[Creepy Steeple]]. When Mario first enters the steeple there is only one Boo in the room who says that he misses his friends. He will let Mario through one door (Blocking him from using any other doors), where he finds a chest. When he opens it, 200 Boos fly out. The last Boo asks Mario "How many Boos came out of that chest?" If Mario answers correctly the Boo will give him an [[Ultra Shroom]]. If Mario is wrong the Boo will give him one [[Coin]]. Upon returning the main room, the first Boo is still there. He asks if Mario is going to be mean to him. If Mario answers "No", a bunch of Boos (The same ones from the treasure chest) will start flying around the main room, attempting to swarm Mario. If successful, they will throw Mario out of the Steeple, exactly like the [[Sentinel]]s in [[Tubba Blubba's Castle]]. If Mario Spin Attacks them several times, they merge into the [[Big Boo#Paper Mario series|Atomic Boo]]. Once the Atomic Boo is defeated, Mario can fight Boos in other parts of the Steeple. Even before defeating the Atomic Boo, Boos could still be found, but only when accompanying [[Swoop]]ers.

The original Creepy Steeple Boo sends a letter to Mario that thanks him for freeing his friends, despite the fact that he and his friends attacked him. He signs the letter "[[The Creepy Steeple Boo]]". More Boos can be found in the Pit of 100 Trials. In this game, Boos attack by becoming invisible and getting close to Mario or the partner, then becoming visible and making a glare at them, causing 3 damage. However if Mario or his allies gets lucky in battle, the Boo who tried to attack Mario and his partner will be tired out. The game also introduces a more powerful sub-species, the [[Dark Boo]], which can be found in [[Poshley Sanctum]].

====''Super Paper Mario''====
[[File:Mansion patrol.png|thumb|left|Boos in the minigame [[Mansion Patrol]] in the Flipside Arcade from ''Super Paper Mario'']]
[[File:92 BooCard.PNG|thumb|Boo's [[Catch Card]]]]
Boos return as enemies in ''[[Super Paper Mario]]''. In this game, they turn invisible if Mario looks at them, but they turn visible and chase him if he is not looking at them, similar to their behavior in ''Super Mario 64''. To defeat them, the player must approach them from the back and then attack them. Additionally, the [[Flipside Arcade]] houses a Boo themed shooting game, Mansion Patrol. This game has the player shooting Boos, including Dark Boos and occasionally Atomic Boos, to score points. A [[Toad]] frequently appears to give power ups, as long as the player saves him from his Boo captor. Lady Bow also makes three cameos in this game.

====''Paper Mario: Sticker Star''====
[[File:Boo PMSS.png|frame]]
Boos reappear in the [[Nintendo 3DS]] title, ''[[Paper Mario: Sticker Star]]'', using their modern appearance from ''Mario Party 4'' and onward. They only appear in World 4-3: [[The Enigmansion]]. Mario must use the [[Book of Sealing]], given by a [[Toad (species)|Toad]], to seal away every Boo that has escaped. In battle, Boos can make themselves disappear and can slap Mario or they can go up to Mario and scare him by making a scary face. They are able to make Mario [[dizzy]] in this game with their scare attack preventing him from using any of his defensive/dodging stickers. The attack is determined by the sound the Boo makes when it disappears.

Among the normal Boos, there is one golden Boo that drops several Coins after Mario defeats it, which can be found in the safe. This Boo attacks exactly like the normal ones. Another notable Boo is one that is crumpled, which is found in a trash can. In battle, it only has 1 HP and cannot attack. Additionally, a group of eighty-two Boos called a [[Boo Stack]] also appears. Once all the Boos get returned to the book and it is placed in its rightful spot, [[Kamek]] appears and turns all the captured Boos into the mini boss, [[Big Boo#Paper Mario series|Big Boo]]. After defeating the mini-boss, the Boos are put to rest once again and the mansion is restored to its former state.

====''Paper Mario: Color Splash''====
[[File:PMCS Boo 10-Stack Idle Animated.gif|thumb|left|A [[Boo Stack]] from ''Paper Mario: Color Splash'']]
Boos return in ''[[Paper Mario: Color Splash]]'' as enemies who can be fought in the parallel universes of [[Vortex Island]], [[Lighthouse Island]] and [[Fortune Island]]. In battle, they attack by either hitting Mario or scaring him. They can disappear while in battle, causing all attacks to miss until they reappear. Outside of battle, if one is stared at too long, it will disappear, and then reappear behind Mario. A Boo appears as an NPC in [[Redpepper Crater]], where it is in a hot spring. A [[Boo Stack|Boo 10-Stack]] variant also appears.
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===''Luigi's Mansion'' series===
====''Luigi's Mansion''====
[[File:LMBoo.jpg|thumb|A Boo in ''Luigi's Mansion'']]
In ''[[Luigi's Mansion]]'', Boos are the main antagonists. King Boo sends a letter to Luigi, stating that he had won a mansion in a contest. However, Luigi did not enter any contest, but pays no attention, and heads off. Mario goes on ahead, but gets captured by the King of the Boos, [[King Boo]]. Luigi has to rescue him from the Boos, using [[Professor Elvin Gadd|E. Gadd]]'s [[Poltergust 3000]]. Luigi manages to find his brother, stuck in a painting. He ends up having to battle King Boo in order to rescue Mario. King Boo sends them to the roof of the mansion, and uses a Bowser suit to battle him. However, the suit's head could come off once a spikeball was thrown at him, and King Boo would float out, leaving him open for Luigi's Poltergust 3000. After taking away all of his 500 HP, King Boo is turned into a painting, and Mario is restored back to his normal self. However, King Boo manages to escape by unknown means and reappears in several future ''[[Mario (franchise)|Mario]]'' games.

There are [[List of Boos in Luigi's Mansion|50 Boos]] (51 including King Boo) which Luigi must suck up in the Poltergust 3000. Of these, 15 of them make up the portrait ghost [[Boolossus]], with King Boo as the final Boo. Unlike the other ghosts in the game, Boos will appear in a room, even when the lights are on. When Luigi attacks them, they usually run away, but occasionally twirl into him to cause damage. All of the 36 Boos, excluding King Boo and counting Boolossus as one Boo, have puns in their names.

The Boos in ''Luigi's Mansion'' seem to be the reverse of the Boos in the ''Super Mario'' series: while the Boos in the ''Super Mario'' series sneak up on Luigi when he's not looking and then disappear/hide when he looks at them, the Boos in ''Luigi's Mansion'' (excluding King Boo and Boolossus) hide when Luigi's not looking at them and then they face Luigi when he finds them. One of the Boos, Peekaboo, references the fact that Boos are notorious for hiding.

====''Luigi's Mansion: Dark Moon''====
[[File:Boo_LMDM.jpg|thumb|left|A Boo from ''Luigi's Mansion: Dark Moon]]Boos appear in ''[[Luigi's Mansion: Dark Moon]]''. They have names that play on "Boo" as in the first game. [[King Boo]] appears, having a similar appearance to that of his debut. Regular missions in the game usually have a Boo in an object that is invisible, and Luigi must find it by revealing the invisible object with the [[Dark-Light Device|Dark-Light]] function of the [[Poltergust 5000]]; the Boo appears after the revealed [[Spirit Ball]]s have been vacuumed up. However, not all Boos are hidden in invisible objects. To capture a Boo, Luigi must expose it with the Dark-Light, vacuum and pull on the Boo's tongue, and release it with the {{button|3ds|A}} Button, damaging the Boo as it bounces around the room. When its HP reaches 0, it can be sucked up. After it is sucked up, it will be stuck onto the nozzle. Luigi then presses the Poltergust 5000 against the ground to shove it inside. When Luigi returns to the [[Bunker]] after completing a mission, any captured Boos are sent to the Boo Canister in the [[E. Gadd's Vault|Vault]]. After all Boos in a mansion have been captured, a bonus mission is unlocked for the corresponding mansion. There are a total of [[List of Boos in Luigi's Mansion: Dark Moon|32 Boos]], 33 if counting King Boo.

===''Mario & Luigi'' series===
====''Mario & Luigi: Superstar Saga'' / ''Mario & Luigi: Superstar Saga + Bowser's Minions''====
[[File:Castleinterior.png|thumb|A Boo chases the Mario Bros. in ''Mario & Luigi: Superstar Saga''.]]
In ''[[Mario & Luigi: Superstar Saga]]'', Boos are enemies that only appear in [[Bowser's Castle]]; they aid [[Bowletta]] along with the rest of the minions who believe her to be Bowser. Outside of battle, they hover around, attacking Mario and Luigi when they are not looking. However, they look away if Mario or Luigi make eye contact. The Boos also show the ability to teleport. In battle, a Boo has two attacks. For the first attack, the Boo will teleport in front of one of the brothers and attempt to bite him. For the second attack, it will fly up into the air and swoop into one of the Mario Bros., which can even prohibit the use of certain moves or items. The former attack can be countered with Mario or Luigi's hammer, whereas the latter can be dodged or countered by jumping. In either of these attacks, if the Boo makes a face, it will target Luigi, if it does not, it will target Mario. Boos are weak to [[Firebrand]] and [[Fire Bros. (move)|Fire Bros.]] They also have low HP, but very high defense.

[[File:MLSS_Miner_Boo.gif|frame|left|]]
Boos wearing mining helmets and brandishing pickaxes also appear in levels 4 and 5 of [[Mysterious Mine Carts]]. If these Boos touch Mario, they will cause the loss of a diamond. They will slowly shrink until they disappear if the flashlight is pointed at them.

Boos appear in the main game and in ''Minion Quest: The Search for Bowser'' from ''[[Mario & Luigi: Superstar Saga + Bowser's Minions]]''. Boos are flying troopers, and attack by ramming into enemies. Their [[Special Skill]], Evasion Cloak, allows them to increase their evasion, depending on how filled the meter that is shown becomes. [[Captain Boo]] appears as a playable captain in the game. When a Boo appears as a captain, they are able to attack the other captain from behind, using [[Sneak Attack]].

====''Mario & Luigi: Partners in Time''====
[[File:PiT Boo.gif|frame]]
During the events of ''[[Mario & Luigi: Partners in Time]]'', Boos appear in [[Bowser's Castle]] of the past. Mario, Luigi, [[Baby Mario]], and [[Baby Luigi]] meet a lot of them while trying to reach the end of Baby Bowser's Castle. In the field, Boos attack the same way as they did in ''Mario & Luigi: Superstar Saga'', but in-battle they fight differently, and have significantly decreased defense. They cover their faces, but when they start to attack, the Boo would take one of its hands off one of its eyes, showing who it is about to attack. If it shows its right eye, it will attack Mario, but if it shows its left eye, it is attacking Luigi. Then it would appear from behind, and charge towards one of the Mario Bros.. However, this could easily be countered with a jump. If the attack was not countered then the boo would steal an item which could only be recovered by defeating the boo. After a turn for each brother, the boo would [[Flee]] with the item. They also appear during the battle with [[Sunnycide]]. After the Mario Bros. flip the egg monster over, Sunnycide could summon a Boo to attack Mario or Luigi. [[Dark Boo]]s also return in the game, and are found in the [[Gritzy Caves]]. Also, when a [[Handfake]] has a [[Bowser]] sign, a Boo or a [[Fly Guy]] carries a flame from Bowser's mouth.

====''Mario & Luigi: Bowser's Inside Story'' / ''Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey''====
[[File:Bis Boo plate sprite.PNG|frame|left|A Boo holding a plate from ''Mario & Luigi: Bowser's Inside Story'']]
[[File:BowserMemoryBoo.png|thumb|A [[Bowser Memory Boo]]]]
Boos make a reappearance in ''[[Mario & Luigi: Bowser's Inside Story]]''. They appear in Bowser's Castle, after being brainwashed by [[Fawful]], and they also help many of the former minions of Bowser push the Fawful statue against the powered-up Bowser. In addition, a Boo appears whenever Bowser gets a level up. The Boo (just like the Lakitu in Mario's or Luigi's level up screen) holds the circle for getting a bonus upgrade for the stat of the players choice.

[[Yikk]], a ghost who appears in the same game at the [[Tower of Yikk]], explains that he researches Boos. He even builds a [[Boo-ray Machine|machine]] to visualize Boo transparency waves before he passed away.

An odd thing shown in the game is a Boo and [[Koopa Troopa]] in love with each other in Bowser's Castle. They not only love each other, but also love Fawful, due to the brainwashing that was put on the minions.

One of the Boos in Bowser's Castle holds a plate with [[Midbus]]'s emblem on it.

Boos return in ''[[Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey]]'', where they additionally are found as enemies and recruitable allies in the ''Bowser Jr.'s Journey'' mode.

====''Mario & Luigi: Dream Team''====
[[File:M&LDT Boo Biscuit.png|frame|left]]
While Boos themselves do not appear in ''[[Mario & Luigi: Dream Team]]'', an item named [[Boo Biscuit]] does.

====''Mario & Luigi: Paper Jam''====
[[File:MLPJShinyPaperBoo.png|frame|left]]
Boos appear in ''[[Mario & Luigi: Paper Jam]]'' in a minigame where the player has to save a Toad by running away from Boos and avoiding fireballs. Their [[Paper Boo|paper versions]] also appear as regular enemies. [[King Boo]] also appears as a boss in [[Gloomy Woods]]. [[Boo Biscuit]]s also return from ''[[Mario & Luigi: Dream Team]]''.
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===''Mario vs. Donkey Kong''===
[[File:MvsDK Boo.png|frame|left]]
A Boo appears in ''[[Mario vs. Donkey Kong]]'', acting similar to their other appearances in platforming games. They only appear in [[Level 4-4 (Mario vs. Donkey Kong)|Level 4-4]], but in both segments, and in the plus counterpart, [[Level 4-4+]]. They cannot be defeated, and if they manage to defeat [[Mario]] or the [[Mini Mario (toy)|Mini Mario]], the Boo will grow and stick its tongue out.
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===''Mario Pinball Land''===
[[File:Boo-piranha.jpg|thumb|left|A group of Boos with [[Petey Piranha]] in ''Mario Pinball Land'']]
In ''[[Mario Pinball Land]]'', Boos appear in certain areas in the game. [[Mario]] cannot hit them at the front because they will become transparent as Mario passes through them. If Mario hits one of the Boos on its back, the Boo disappears and it is worth two-thousand points. They occasionally will disappear and reappear to another spot in the area.

A Big Boo also appears as one of the game's bosses. He is the boss of the haunted house and can only be damaged by hitting it from behind.
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===''Yakuman DS''===
[[File:Opponent Selection Screen - Yakuman DS.png|thumb|A Boo on the opponent selection screen from ''Yakuman DS'']]
Boos appear in the Japan-only [[Nintendo DS]] game, ''[[Yakuman DS]]''. They are one of the many opponents. Other opponents include, [[Goomba]], [[Diddy Kong]], and [[Hammer Bro]]. Boos are not unlockable or playable. They are opponents from the start of the game.

===''Dance Dance Revolution: Mario Mix''===
[[File:DDRMMboos.jpg|thumb|left|A Boo with [[Mario]] from ''Dance Dance Revolution: Mario Mix'']]
Some Boos make appearances in ''[[Dance Dance Revolution: Mario Mix]]'' in both regular and giant varieties. Their objective is to try to make [[Mario]] miss a step. If successful, they block Mario's next move. Mario is able to step on regular Boos to hold them back, but he cannot do the same to their gigantic counterparts.
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===''Mario Baseball'' series===
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Boo makes its first baseball appearance in ''[[Mario Superstar Baseball]]''. It is on Wario's team as a starter. Boo is tied with Peach with its pitching, losing only to [[Bowser]] and [[Waluigi]]. Its special running and fielding move is a [[Super Jump (Mario Baseball series)|Super Jump]]. Its running and batting are weak, but its fielding is very poor. The only worse fielder in the game is [[Bowser]].

Boo makes another appearance in ''[[Mario Super Sluggers]]''. It is on Wario's team once again, and it can be unlocked in [[Wario City]] by finding it in between boxes and completing its challenge. Like its predecessor, Boo has the highest ranked pitch in the game, along with Peach (9/10). Despite its pitching being very high, its stamina is very poor, but its other stats range from average to low. Boo displays good chemistry with [[King Boo]], [[Shy Guy]], [[Magikoopa]], and [[Blooper]]. Its chemistry with [[Luigi]], [[Yoshi]], [[Baby Mario]], and [[Baby Luigi]] is bad.

Also, a new item, called Mini Boos, appears. When activated, Mini Boos turn the ball invisible for a short period of time. If used against a computer, the player stops moving until the Boos go away. If used when a special hit is effect, the Boos do nothing.
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===''Super Princess Peach''===
[[File:SPPBoo.png|frame]]
Boos appear in [[Princess Peach]]'s first starring game, ''[[Super Princess Peach]]''. They act as normal Boos, hiding their face when Peach looked, and attacking when Peach has her back turned. However, there is an angry variety called the [[Mad Boo]], which attacks the opposite way. They attack when Peach looks at them, and gander around for her when she looks away. Big Boos and their vibe counterparts, a new species called [[Mad Big Boo]]s, also appear.

King Boo also appears, as one of the bosses of the game. He will attack Peach by shooting fireballs at her, but she can use these to light the candles on the wall, damaging him. His vibe during the game is Gloom, which he will use to douse the candles.

There are several sections of the game where a mass of [[Blindfold Boo]]s will charge towards [[Princess Peach]].
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===''Mario and the Incredible Rescue''===
[[File:MarioAndIncredibleRescue.jpg|thumb|120px|Two Boos on the cover of ''Mario and the Incredible Rescue'']]
Boos make an appearance in the chapter book, ''[[Mario and the Incredible Rescue]]''. The cover features two Boos. One of the Boos is from ''[[Mario Kart: Super Circuit]]'' and the other is a mirrored Boo from ''[[Luigi's Mansion]]''. They are known as "ghosts" in the book. Boos capture [[Princess Peach]] and take her to [[Bowser's Castle]]. Mario also sees a vision of Princess Peach being caged and surrounded by six Boos. Boos are eventually defeated by Mario at the end of the book. To defeat them, Mario casts a spell on them and sends them flying out of the castle.
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===''Tetris DS''===
Boos also appear in the [[Nintendo DS]] game, [[Tetris DS]]. They are one of the few multiplayer items. Boos are able to block the opponent's sight of the upcoming block, making it harder for the opposing player to see the upcoming block. They do not appear in single player.
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===''Mario Hoops 3-on-3''===
[[File:Thriller Dunk.png|thumb|left|Boo performing its [[Thriller Dunk]]]]
[[File:BooHoops.PNG|thumb|Boo from ''Mario Hoops 3-on-3'']]
Boo makes an appearance in ''[[Mario Hoops 3-on-3]]''. It appears as an unlockable character. It is unlocked by beating the [[Flower Tourney]] on hard. Boo's special ability is the [[Thriller Dunk]]. This is performed by tapping a ''B''-like shape twice. In the game, the Boo is classified as a tricky character. The other tricky characters are [[Paratroopa]], [[Fly Guy]], and [[Moogle]]. Boo is also one of many of the unlockable characters to not have a baller name. 
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===''Mario Strikers Charged''===
[[File:Boo MSC.jpg|thumb|left|Boo from ''Mario Strikers Charged'']]
Although Boos do not appear in ''[[Super Mario Strikers]]'', they do appear in its sequel, ''[[Mario Strikers Charged]]''. Boos, along with [[Hammer Bro]]s., [[Toad (species)|Toads]], [[Koopa Troopa]]s, [[Birdo (species)|Birdos]], [[Dry Bones]], [[Monty Mole]]s, and [[Shy Guy]]s, are sidekicks to the many captains. They appear with a helmet with the logo of their team captain. Boos are classified as a playmaker. The only other playmaker sidekicks are Toads. Their skillshot is [[Possess]]. The given description of the Boos is: "''This ghost can fly up and down the sidelines with great speed, using precise and accurate passing to lead his team to victory. His long-distance shots are quite weak though and his hits are not very powerful. If Boo gets a chance, he can Possess the ball and score at will.''" Boo's appearance in this game resembles that of the [[Spooky Speedster]].
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===''Mario & Sonic'' series===
[[File:BooMASATOG.png|frame|100px]]
Boos are minor, supporting characters in ''[[Mario & Sonic at the Olympic Games]]''. It appears in the version for the [[Wii]] and [[Nintendo DS]]. They are not playable characters, but they can be seen in the crowd with other ''[[Mario (franchise)|Mario]]'' enemies, including [[Bullet Bill]]s, [[Goomba]]s, and [[Bob-omb]]s. Though Boos do not appear in ''[[Mario & Sonic at the Olympic Winter Games]]'', [[King Boo]] is one of the rivals. A Boo teams up with King Boo in the [[Nintendo 3DS]] version of ''[[Mario & Sonic at the London 2012 Olympic Games]]'' (in Story Mode) to face off against [[Sonic the Hedgehog]] and [[Miles "Tails" Prower]] in Badminton-Doubles.
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===''Super Smash Bros.'' series===
====''Super Smash Bros. Melee''====
In ''[[Super Smash Bros. Melee]]'', Boo appears as a collectible trophy.

====''Super Smash Bros. Brawl''====
[[File:BrawlTrophy169.png|thumb|100px|left|The trophy of a Boo from ''Super Smash Bros. Brawl'']]
As well as appearing as a [[Trophy (Super Smash Bros. series)|trophy]] in ''[[Super Smash Bros. Brawl]]'', Boos make cameos in the [[Luigi's Mansion (stage)|Luigi's Mansion stage]]. When a part of the mansion is knocked down, Boos are seen flying out. Boo from ''Mario Tennis'' also appears as a collectible [[Sticker (Super Smash Bros. Brawl)#Boo|sticker]].

====''Super Smash Bros. for Nintendo 3DS'' / ''Wii U''====
Boo appears in the form of a collectible trophy in ''[[Super Smash Bros. for Nintendo 3DS]]'' and ''[[Super Smash Bros. for Wii U]]''. In the latter, Boos return in the Luigi's Mansion stage from ''Super Smash Bros. Brawl'', and they appear as [[smashwiki:Smash Tour|Smash Tour]] items: when used, the player starts a battle invincible.

====''Super Smash Bros. Ultimate''====
A Boo appears in ''[[Super Smash Bros. Ultimate]]'' as a neutral, novice, primary [[Spirit (Super Smash Bros. Ultimate)|spirit]]. Its artwork is from [[New Super Mario Bros. U]]. It can be enhanced to a [[King Boo]] spirit at level 99. The Boos from the Luigi's Mansion stage also return.
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===''Mario Sports Mix''===
[[File:LMSportsMix.png|thumb|left|Boos seen in the background in ''Mario Sports Mix'']]
Boos appear in ''[[Mario Sports Mix]]''. They appear as the only members of the crowd in [[Luigi's Mansion (place)#Mario Sports Mix|Luigi's Mansion]] circling around the court. Their appearances are in [[Mario Sports Mix#Basketball|Basketball]] and [[Mario Sports Mix#Volleyball|Volleyball]] matches and their laughs can also be heard during the game. Mainly, they can be heard when the player gets a point.
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===''Captain Toad: Treasure Tracker''===
[[File:TreasureTracker-E32014-Screenshot11.png|thumb|A shy Boo in ''Captain Toad: Treasure Tracker'']]
Boos return in ''[[Captain Toad: Treasure Tracker]]'', functioning the same as they did in ''Super Mario 3D World'' with a few minor tweaks. Despite still chasing the player when not watched, Boos and [[Big Boo]]s can easily be destroyed with Toad's or Toadette's headlamp.

Interacting with Boos on the touch screen or with the pointer functionality will cause them to disappear until the player points away. Unlike most enemies in the game, holding the pointer on boos for however long will not reward a coin.
{{br}}
===''Mario Sports Superstars''===
[[File:Card SuperRare Boo.png|thumb|A Super Rare Boo card from ''Mario Sports Superstars'']]
Boo appears as one of the starter captain-type characters in ''[[Mario Sports Superstars]]''. In most sports, he is classified as a Technique type character, sharing this attribute with [[Princess Peach|Peach]], [[Princess Daisy|Daisy]], and [[Waluigi]]. As such, he excels in aspects such as shot accuracy or horse control. In tennis, Boo is instead a Tricky type character, as per his appearances in the ''Mario Tennis'' series, alongside [[Bowser Jr.]] and [[Rosalina]]. His rallies have a tendency to curve, making it tricky for the opponent to predict the trajectory of his shots. In golf, Boo's default drive is 213 yards, and his shots travel medium-low in a draw trajectory.
{{br}}
===''Mario + Rabbids Kingdom Battle''===
[[File:MoonlightSonata MarioRabbids.png|thumb|left|A Boo in [[Moonlight Sonata]] from ''Mario + Rabbids Kingdom Battle'']]
Boos appear as obstacles in certain areas in ''[[Mario + Rabbids Kingdom Battle]]''. They warp to certain areas during the turn transition between the heroes and enemies. If a Boo converges on a character, it will follow said character and force them to warp to a random spot on the battlefield along with the Boo.
{{br}}
==General information==
===Appearance===
[[File:Boo art04.png|thumb|left|A laughing Boo with a shy Boo]]
[[File:Boo_History.PNG|frame|''Boos'' as they appear in various games]]
Though their specifics change from game to game, Boos are usually bashful, cowardly, spherical ghosts. They have black beady eyes and fangs. Although they are typically white, there are sub-species of the Boo race which appear in different colors, such as [[Red Boo|pink]]. From ''[[Luigi's Mansion]]'' onward, it became common to picture Boos sticking out their tongues. Since ''[[Super Mario 64]]'', Boos have been portrayed with a unique, high-pitched laugh. This laugh is the same as [[Bowser]]'s, sped up several times<ref>[http://didyouknowgaming.com/post/30739056161/super-mario-64-audio-proof-http-bit-ly-96nps Audio comparison of Boo and Bowser's laughs]</ref>. However, Boos got a new laugh starting in ''[[Mario Power Tennis]]'', being more of a haunting laugh than before. Although most species of Boo will cover their faces and become intangible when looked at, they will often sneak behind their victim and strike when their back is turned. Due to their ghostly abilities, Boos are generally invulnerable and cannot be harmed by ordinary means of attack. Despite this, they are not invincible and are especially vulnerable to the light. If they are exposed to a source of light, Boos are usually weakened, and in some cases they may even be defeated. Usually, they can also have other weaknesses. Because of their intolerance to the light, Boos will often hide if they are trapped in lit rooms. While the ghosts generally appear to be more afraid of their victims than their victim is of them, this is not always the case. Some Boos have absolutely no problem meeting their victim's gaze, and will even try to attack. Boos tend to have a taste for the fine arts, as seen in ''[[Paper Mario]]'' and ''[[Mario Party 4]]''. In ''[[Luigi's Mansion: Dark Moon]]'' it is shown that Boos will actually save someone if only later to trick them. This is seen when Luigi watches through pipe in the [[Old Clockworks]] as a Yellow Toad balances on a ledge. Some Boos appear and watch the Toad before it falls off the ledge, which is later found to be quite a drop, the Boos show a large amount of concern and shock when this happens before diving down for the Toad. The Toad though is later found in a painting because of the Boos.

Boos are often characterized by their sub-species despite their similarities in appearance and attack manner. Boo species tend to wildly differ in size, with some such as [[Boo Buddy|Boo Buddies]] being miniature, while others such as the [[Big Boo]]s boast gigantic size. 

In ''[[Luigi's Mansion]]'', [[Professor E. Gadd]] notes that Boos have mysterious powers that increase when they gather together in large groups. While it is difficult to stop them, they can be weakened if one is able to defeat members of the group. Although in ''Luigi's Mansion: Dark Moon'' this does not seem to affect them or King Boo in any way suggesting that they do not always need to be in groups anymore.

Boos have few predators, their only known threat being a [[Spike]] named [[Tubba Blubba]]. This is first seen in ''Paper Mario'', when he began devouring Boos; this, however, may have been his revenge for the countless times the ghosts scared him.

===Tools===
*[[Boo's Sheet]] - ''[[Paper Mario: The Thousand-Year Door]]
*[[Fright Bomb]] - ''[[Super Mario RPG: Legend of the Seven Stars]]
*[[Boo Bell]] - ''[[Mario Party 2]]
*[[Boo's Crystal Ball]] - ''[[Mario Party 4]]

===Habitat===
Boos typically make their homes in dark forests, such as the [[Forever Forest]] and [[Boo Woods]], and tend to be most commonly found in older buildings such as mansions, castles, and [[Ghost House]]s. Although most of them live in such dwellings, they also seem to enjoy wastelands. One of the only known Boo villages lies in [[Gusty Gulch]].
 
They are typically found in groups because their fears make them find strength in big numbers.

===Allegiance===
Though most Boos tend to side with [[King Boo]], they seem to, for the most part, actually stand as neutral. For example, Boos are by now a common enemy in most side-scrolling games; however, in the ''Paper Mario'' series and now increasingly in the multiplayer games, Boos have been seen to take the side of the [[Mushroom Kingdom]]. Lady Bow, in fact, helped [[Mario]] save the kingdom in ''[[Paper Mario]]''. In another example, the Boos in the [[Creepy Steeple]] from ''[[Paper Mario: The Thousand-Year Door]]'' attack Mario initially, but later in the game Mario is sent a friendly letter from one of them. King Boo, on the other hand, has several times been shown to wish nothing but terrible things for [[Luigi]] (but this could be accredited to Luigi being easily scared, making him a prime target for most Boo antics). They also have attacked [[Bowser]] in some games, such as the [[Mario Party (series)|''Mario Party'' series]], mainly from ''[[Mario Party 5]]'' to ''[[Mario Party 8]]''.

===Language===
As hinted in the game ''[[Super Mario Galaxy]]'', Boos have their own unique language called Booish. It most probably is spoken only by Boos since Mario cannot understand it. However, upon absorbing a [[Boo Mushroom]] and turning into [[Boo Mario]], he gains the ability to read it, if not speak it as well.

''[[Paper Mario]]'' also features Boos replacing certain words with "Boo", possibly as a part of the Booish language:

<blockquote>
''I am so bored!! Boo-ored!

''Boo-st of luck!

''Hey, what can I Boo for you?

''It's going to be the most Boo-tiful wedding ever!
</blockquote>

==Official profiles and statistics==
{{main|List of Boo profiles and statistics‎}}
===''Super Smash Bros. Melee''===
{|border=1 cellpadding=1 cellspacing=0 width=100%
|-
!width=100px|Name!!width=100px|Image!!width=150px|Game!!|Description
|-
!Boo
|[[File:Trophy209.PNG|100px]]
|align=center|''Super Mario Bros. 3''<br>02/90
|''These shy spirits inhabit Mario's world and have been known to vanish or freeze when met face-to-face. In recent years, they seem to have overcome their fears in order to pursue tennis and other social activities. They usually appear in groups and fly in formation. From time to time, giant Boos make surprise appearances.''
|-
|}

===''[[Mario Superstar Baseball]]'' information===
*'''Type:''' Technique
*'''Starting Team Captain:''' [[Wario]]
*'''Status:''' Player
*'''Stats:'''
**'''Batting:''' 3/10
**'''Pitching:''' 8/10
**'''Fielding:''' 2/10
**'''Running:''' 4/10
*'''Player Profile:'''
**'''Strength:''' Pitching
**'''Special Talents:''' Super Jump
**'''Trajectory:'''
***'''Field:''' Center
***'''Height:''' Normal
*'''Star Pitch:''' Curveball
*'''Star Swing:''' Center
*'''Sweet Spot:''' The Boo face on the bat
*'''Compatible Relationships:''' [[Wario]], [[Magikoopa]], [[King Boo]]
*'''Bio:''' ''"Bowser's underling ghost. Behind the scary face lies a very shy soul. Look most Boos in the eyes and they'll cover their faces...but turn around and they'll attack you! Boos confuse their enemies by flickering in and out of the visible realm, appearing at inconvenient times."''

==Names in other languages==
{{foreign names
|Jap=テレサ<br>''Teresa''<br>テレサ(<span class="explain" title="しょう">小</span>) (''Yoshi's Island DS'')<ref>[https://i.imgur.com/Y5X3lRz.jpg ''Yoshi's Island DS'' Nintendo Dream Book, page 17.]</ref><br>''Teresa (Shō)''
|JapM=From the Japanese verb 照れる ''tereru'', "to be shy"; romanized as "Telesa" in ''Super Mario World''.<br><br>"Boo (Small)", in comparison to [[Big Boo]].
|SpaA=Bú
|SpaAM=Boo
|SpaE=Boo
|SpaEM=-
|Fra=Boo<br>Fantôme
|FraM=-<br>Ghost
|FraA=Les amis de Boo (SNES ''[[Super Mario World]]'' manual)
|FraAM=Boo's friends
|Dut=Boo
|DutM=-
|Ger=Buu Huu
|GerM=Boo Hoo
|Ita=Boo<br>Boo Hoo (''Mario Kart DS'')
|ItaM=-
|Por=Bu (''Super Mario Run'')<br>Boo Budies{{sic}} (''Super Mario World'' manual)<br>Monstro (''[[The Adventures of Super Mario Bros. 3]]'')
|PorM=Boo<br>-<br>Monster
|Rus=Бу
|RusR=Bu
|RusM=Boo
|Kor=부끄부끄
|KorR=Bukkeubukkeu
|KorM=Onomatopoeia of being shy
|Chi=害羞幽靈 (Traditional)<br>''Hàixiū Yōulíng''<br>嘘嘘鬼 (Simplified)<ref>无敌阿尔宙斯 (August 28, 2013). [http://tieba.baidu.com/p/2560204606 神游 超级马力欧世界 敌人官译]. ''Baidu Tieba''. Retrieved February 2, 2017.</ref><br>''Xūxū Guǐ''
|ChiM=Shy Ghost<br><br>Shy Ghost
|Rom=Bau Bau (''The Adventures of Super Mario Bros. 3'')<br>Boo<ref>[[Media:McDonaldsRomaniaBanner.jpg|McDonald's Romania, Summer 2016 Happy Meal promotion]]</ref> 
|RomM=Boogeyman<br>-
}}

==Gallery==
{{main-gallery}}
<gallery>
SMW Art - Boo Buddies.png|''[[Super Mario World]]''
BooMP2.png|''[[Mario Party 2]]''
BooTennis64.PNG|''[[Mario Tennis]]''
MPA Boo.jpg|''[[Mario Party Advance]]''
Boo Artwork - Mario Party Island Tour.png|Boo in ''[[Mario Party: Island Tour]]''.
Boo Artwork - Mario Golf World Tour.png|''[[Mario Golf: World Tour]]''
</gallery>

==Trivia==
[[File:Minecraft Wii U Boo.jpg|thumb|Boo as it appears in ''Minecraft'']]
*Creator [[Shigeru Miyamoto]] got the idea for Boo from the wife of his coworker and close friend [[Takashi Tezuka]], as she is shy but one day got very angry with him for coming home late from work.<ref>http://www.guardian.co.uk/technology/gamesblog/2010/sep/13/games-gameculture</ref><ref>[[Nintendo Power]], August 1995 issue, {{page needed}}</ref>
*[[wikirby:Mumbies|Mumbies]], enemies from the ''[[wikirby:Kirby (series)|Kirby]]'' series, attack in an identical way to Boos.
*In the mainstream games, Boos, [[Crowber]]s, and [[Peepa]]s are the only enemies that make vocal noises. Coincidentally, all three of these enemies appear in or next to [[Ghost House]]s.
*In the Super Mario Mash-Up Pack in ''[[Minecraft]]'', Ghasts are replaced by Boos.
*Boo is also a playable Character in ''[[Monopoly Gamer]]''. He is sold separately as a "Power Pack" expansion figure.

==References==
<references/>
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