World-e

Not to be confused with e World from Mario vs. Donkey Kong or Orbiting Observatory (also known as World E) from Mario vs. Donkey Kong: Tipping Stars.

World-e (alternatively e-Reader world or the e-World) is a bonus world, which has an island shaped like a lowercase "e," found only in Super Mario Advance 4: Super Mario Bros. 3. The world itself is separate from the main adventure, and it is not required for 100% completion. Although it sports no standard levels within its vicinity, World-e features a Warp Zone that can warp Mario and Luigi to brand-new levels, provided the player has scanned and loaded the appropriate level cards with an e-Reader. World-e is normally disabled in the European release due to the level cards being unreleased, but it can be accessible via exploiting a save file glitch, revealing it had been fully translated and left intact. Hidden within the new levels are Advance Coins. If the player accumulates enough Advance Coins, the player will gain access to the three Toad's Houses in the area, where they can play minigames in exchange for a few of their grand total of coins from World-e. However, due to the limited support for the e-Reader outside Japan, players overseas can access fewer levels and only enough Advance Coins to enter the Blue Mushroom House (a digging minigame). Players in Japan can acquire enough to open the Red Mushroom House (a ball-throwing minigame) and Orange Mushroom House (a Balloon Fight–esque minigame, except going up and with a P-Wing). Certain levels also have an e-Coin hidden inside them. e-Coins are usually well hidden and can be collected only once. They are then put on display in the e-Coin Castle. However, due to the premature cancellation of the e-Reader outside Japan, only three e-Coins can be obtained elsewhere—the Mushroom, Super Leaf, and Starman e-Coins. Players outside Japan were able to acquire those three alongside the Fire Flower, Mario, Luigi, Toad, and Princess Peach e-Coins.

In all Virtual Console and Game Boy Advance - Nintendo Classics versions of the game, all levels in World-e are unlocked by default (being present in the European version for the first time), including all of the levels released in Japan. Consequentially, all World-e Toad's Houses are also accessible upon the player gaining the necessary Advance Coins.

Levels

Code	Level	Difficulty rating	Preview	Summary
★01	Classic World 1-1	★☆☆☆☆		A remake of World 1-1 from the original Super Mario Bros.
★02	Classic World 1-2	★★☆☆☆		A remake of World 1-2 from the original Super Mario Bros.
★03	Classic World 1-3	★☆☆☆☆		A remake of World 1-3 from the original Super Mario Bros.
★04	Classic World 1-4	★★☆☆☆		A remake of World 1-4 from the original Super Mario Bros.
★05	Classic World 2-2	★★☆☆☆		A remake of World 2-2 from the original Super Mario Bros.
01	Wild Ride in the Sky	★★★☆☆		An auto-scrolling sky level with many moving platforms.
02	Slidin' the Slopes	★★☆☆☆		A desert level with great slopes and Triangular Blocks.
03	Vegetable Volley	★★☆☆☆		A level with grass to pull out vegetables like in Super Mario Bros. 2 and a group of Chargin' Chucks.
04	Doors o' Plenty	★★★★☆		A maze-like Ghost House with many doors and Boos with a Big Boo as the boss.
05	Bombarded by Bob-ombs	★★★★☆		An auto-scrolling tank level with many Bob-ombs and cannons firing them. Boom Boom is at the end as the boss.
06	Magical Note Blocks	★★★☆☆		An upward cave level with Jump Blocks forming the way.
07	The ol' Switcheroo	★★★☆☆		An underground tunnel level with coins. The player needs to hit Switch Blocks to turn coins into pathways.
08	Piped Full of Plants	★★★★☆		A level made of mostly pipes with many Piranha Plants and Fire Piranha Plants.
09	Swinging Bars of Doom	★★★★☆		A castle level with Fire-Bars. Two Boom Booms are at the end as bosses.
10	Para Beetle Challenge	★★★★★		An auto-scrolling sky level with many Para-Beetles acting as platforms.
11	A Musical Trek	★★★☆☆		A sky level with many Jump Blocks forming the way.
12	Armored Airship	★★☆☆☆		An auto-scrolling airship level with Lemmy Koopa as the boss.
13	Ice Dungeon	★★★★☆		A level consisting of an underground cave segment and several aboveground ice-themed segments.
14	A Sky-High Adventure	★★★☆☆		A short level with an optional maze of doors and rooms requiring the abilities of the Tanooki Suit.
15	Sea to Sky	★★☆☆☆		A level with seaside and underwater segments and a final sky segment requiring the Cape Feather's flying ability.
16	It's a Shoe-In	★★★☆☆		A castle level with many obstacles requiring the Goomba's Shoe.
17	Slip Slidin' Away	★★★★☆		An ice-themed level with many Stretch Blocks and Bumpties, with a back-and-forth auto-scrolling segment near the end.
18	Ice Cubed	★★★★☆		An ice block fortress with many Frozen Coins and two Boom Booms as bosses.
19	Puzzling Pipe Maze	★★★☆☆		A desert level with a large pipe maze.
20	A Towering Tour	★★★☆☆		A level consisting of a sky segment with snake platforms and a descending tower segment.
21	Castle Dash	★★★★★		A castle level with a short time limit, requiring the playing to dash through lots of obstacles.
22	Rich with Ropes	★★☆☆☆		A desert level with many ropes and Hoopsters on them.
23	Vexing Doors	★★★★☆		A Ghost House level with a maze of doors, snake platforms, and Switch Blocks. A Big Boo is at the end as the boss.
24	Caped Escape	★★★☆☆		A sky level requiring the Cape Feather's flying ability.
25	Ground Work	★★★☆☆		An underground desert level with lots of soft sand to dig through.
26	An Aqueous Adventure	★★★★☆		An underwater level with many Fire-Bars and Rotary Lifts.
27	Bowser's Last Stand	★★★★★		A longer take on Bowser's Castle with Bowser as the boss.
28	Koopaling Confusion	★★★☆☆		An auto-scrolling battleship level with Ludwig von Koopa as the boss.
29	Bowser's Airship 1	★★★★☆		The first part of an auto-scrolling airship level with Boom Boom as the boss.
30	Bowser's Airship 2	★★★★★		The second part of an auto-scrolling airship level with Bowser as the boss.
PR	Airship's Revenge	★★★☆☆		An auto-scrolling airship level with Morton Koopa Jr. as the boss.
PR	No Time to Dawdle	★★★★★		Another level with a very short time limit, requiring the player to rush through the course.
PR	Treacherous Halls	★★★★★		A castle level with many spiked floors, requiring the player to stomp on enemies to cross them. A Boom Boom is fought here.

Names in other languages

Language	Name	Meaning	Notes
Japanese	WORLDe+[?] Wārudo Ī Purasu	World e plus	Early release version of Super Mario Advance 4: Super Mario Bros 3
	ワールドe+[?] Wārudo Ī Purasu		Late-shipping version, Virtual Console version, and Game Boy Advance - Nintendo Classics version
French	Monde-e[?]	World-e
German	e-Welt[?]	e-World
Italian	Mondo-e[?]	World-e
Spanish	Mundo-e[?]	World-e