Balloon Boo

A Balloon Boo in an early screenshot of New Super Mario Bros.

Balloon Boos are large relatives to Big Boos. They are small, and act like normal Boos, but if looked at, they will start sucking in air. The more air they suck in, the larger they get. If the player turns away from them, they will start to chase the player, letting out the air they sucked in in the process, and thus decreasing in size again.

Balloon Boos only appear in New Super Mario Bros., only in World 4-Ghost House.

This article is a stub. Please consider expanding it to include any missing information.

[Edit] New Super Mario Bros.
Playable characters		Mario • Luigi
Forms		Mario (small) • Super Mario • Fire Mario • Invincible Mario • Mega Mario • Mini Mario • Shell Mario
Non-playable characters		Princess Peach • Toads • Toadsworth • Dorrie • Giant Wiggler
Enemies		Amp • Balloon Boo • Banzai Bill • Big Whomp • Blockhopper • Blooper • Blooper Nanny • Bob-omb • Boo • Boomerang Bro • Broozer • Bullet Bill • Buzzy Beetle • Chain Chomp • Cheep-Cheep • Cheep-Chomp • Climbing Koopa • Crowber • Deep-Cheep • Dry Bones • Fire Bro • Fire Snake • Flame Chomp • Goomba • Hammer Bro • Kab-omb • Koopa Paratroopa • Lakitu • Mega Cheep-Cheep • Mega Deep-Cheep • Mega Unagi • Mini Goomba • Moneybags • Paragoomba • Piranha Plant • Podoboo • Pokey • Scuttlebug • Skeeter • Sledge Bro • Snailicorn • Snow Spike • Spike Bass • Spike Top • Spiny • Spiny Egg • Splunkin • Squiggler • Super Dry Bones • Super Piranha Plant • Super Thwomp • Sushi • Swoop • Thwomp • Unagi • Venus Fire Trap • Whomp • Wiggler
Obstacles		Ball 'n' Chain • Banzai Bill Cannon • Bill Blaster • Bill Blaster Turret • Burner • Fire Bar • Giant Spiked Ball • Lava • Lava tide • Pit • Poison • Quicksand • Shifting wall • Skewer • Snow bank • Snowy Branch • Spike Ball • Spikes • Volcanic debris • Volcano • Water tide • Whirlpool
Bosses		Bowser Jr. • Bowser • Mummipokey • Cheepskipper • Mega Goomba • Petey Piranha • Monty Tank • Lakithunder • Dry Bowser • Bowser (large)
Items and power-ups		1-Up Mushroom • Big Star • Blue Coin • Blue Shell • Buzzy Shell • Coin • Fire Flower • Hidden Coin • Key • Koopa Shell • Mega Mushroom • Mini Mushroom • Red Coin • Springboard • Star Coin • Starman • Super Mushroom
Objects		! Switch • ? Block • ? Switch • Bell-shaped contraption • Brick • Bridge • Bubble-jet pipe • Bumper • Cliff • Conveyor Belt • Cork • Crumbling ledge • Donut Block • Door • Dotted-Line Block • Drawbridge • Face block • Fence • Flag (midway point) • Flip panel • Floating barrel • Floor • Flying ? Block • Gelatin • Ghost-coaster • Gray Block • Green platform • Hanging vine • Haunted Stairs • Hinged device • Ice Block • Ice patch • Lift • Manhole • Moving ? Block • Moving Mushroom • Moving pole • Mushroom Platform • Mushroom Trampoline • One-way gate • P Switch • Paddle wheel • Phantom Hand • Pipe • Pole • Pole (goal) • Pole (secret goal) • Red block • Red Ring • Red-and-yellow block • Rippling Floor • Rolling log • Rope • Rotating platform • Roulette Block • Sand Dune • Scale Lift • Seesaw • Seesaw Shroom • Semisolid Platform • Sinking and Rising Mushrooms • Skull switch • Small pipe • Snake platform • Spiked ? Block • Spin Block • Stretch Shroom • Swing • Tilting mushroom • Tilting platform • Vine
Worlds		World 1 • World 2 • World 3 • World 4 • World 5 • World 6 • World 7 • World 8
Moves		Crouch • Dash • Double Jump • Drill Spin • Ground Pound • Jump • Shell Toss • Slide • Spin Jump • Stomp • Swim • Triple Jump • Wall Jump
Gameplay elements		Castle • Challenge • Ghost House • Paah • Stored Item • Sub-area • Time Limit • Toad House • Tower • Warp Cannon
Minigames	Action	Balloon Racing • Danger, Bob-omb! Danger! • Lakitu Launch • Snowball Slalom • Snowball Slam • Vs. Lakitu Launch • Whack-a-Monty
	Puzzle	Coincentration • Hide and Boo Seek • Loves Me...? • Puzzle Panel • Wanted! • Which Wiggler?
	Table	Bob-omb Reverse • Luigi's Thrilling Cards • Luigi-Jack • Memory Match • Pair-a-Gone • Picture Poker • Speed
	Variety	Bob-omb Squad • Bounce and Trounce • Mario's Slides • Sort or 'Splode • Trampoline Time
	1 on 1	Bob-omb Sudden Death • Bob-omb Trampoline • Jumping Sudden Death • Jumping Brothers • Lakitu Launch • Vs. Mario's Slides • Vs. Pair-a-Gone • Vs. Trampoline Time
Music compositions		"Main Theme" • "Mega Mario" • "BGM Tride" • "P Switch BGM" • "Course Clear"
Further info		1-Up Hunt! • Fire Mario no Ball Game • Gallery • Glitches • Luigi no Block Game • Mario no Coin Game • Media • Pre-release and unused content • Staff

[Edit] Boos
Characters	Big Boo • Bigger Boo • Boo (Mario Party 4) • Boo (The Trial Course) • Boo (Three Musty Fears) • Boo Mario • Boo Stack • Boolossus • Boos in Luigi's Mansion • Boos in Luigi's Mansion: Dark Moon • Boos in Luigi's Mansion 3 • Bootler • Captain Boo • Franky • Herbert • Igor • King Boo • Lady Bow • Lahla • Papercraft King Boo • Peeka • Phantom • Spooky Speedster • Stanley • The Creepy Steeple Boo
Species	Balloon Boo • Big Boo • Big Frame Boo • Big & Little Boo • Blindfold Boo • Block Boo • Bomb Boo • Boo • Boo 10-Stack • Boo Balloon • Boo Buddies • Boo Buddy Snake • Boo Crew • Boo Guy • Boohemoth • Broozer • C. Fishing Boo • Dark Boo • Dark Dark Boo • Disappearing Boo Buddy • Eerie • Fishing Boo • Frame Boo • Ghost Goomba • Glohm Boo • Gold Big Boo • Gold Boo • Hammer Knight • High Boo • Jelly Ghost • Mad Big Boo • Mad Boo • Mega Boo • Mini Boo • Octoboo • Paper Boo • Paper Broozer • Paper Macho Boo • Peepa • Red Boo • Sleepy Boo • Stretch • Tail Boo
Related items	Boo Ball • Boo Bell • Boo Mushroom • Boo Radar • Boo Repellant • Boo-ray Machine • Boo's Sheet • Gaddlight • Pink Boo Orb • Peepa Bell