World B-4

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Not to be confused with Level B-4.

Level
World B-4
Level code	World B-4
World	World B
Game	Super Mario Bros.: The Lost Levels
Time limit	300 seconds
Boss	Fake Bowser (fire, Koopa Troopa)
Music track	Castle Theme
Music sample
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World B-4 is the fourth and final level of World B in Super Mario Bros.: The Lost Levels and the twelfth secret level overall in said game, taking place in a castle.

Layout

The player starts at the top of some stairs that end at a pit of lava with small platforms and pillars. After a pipe with a Piranha Plant, there are two Fire Bars over a pit of lava and a Brick Block with a power-up in a crevice to the left. In the upcoming narrow passage, the player will have to fall onto a moving lift to pass under a wall (while crouching if needed) and jumping back up once on the other side to continue. Next, the player will have to move through an area with large platforms, with Fire Bars and pipes with Piranha Plants alternating between them. The first three are Warp Pipes that lead back to the beginning of the level, though the fourth is a Warp Pipe that leads to a Warp Zone to World D. After the fourth pipe is lava with a Fire Bar over it before the Fake Bowser.

Enemies and obstacles

Image	Name	Count
	Red Piranha Plant	6
	Fire-Bar	7
	Fake Bowser (Green Koopa Troopa)	1 (FDS boss)
	Fake Bowser (Cheep Cheep (Green))	1 (SNES boss)

Items

Image	Name	Count	Note(s)
	Mushroom/Fire Flower	1

Level maps

File:NES LL World B-4 Map.png

Map of World B-4

File:SMAS LL World B-4 Map.png

Map of World B-4 (Super Mario All-Stars version)