World B-1

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Not to be confused with Level B-1.

Level
World B-1
Level code	World B-1
World	World B
Game	Super Mario Bros.: The Lost Levels
Time limit	400 seconds
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World B-1 is the first level of World B in Super Mario Bros.: The Lost Levels and the ninth secret level overall in said game.

Layout

The player starts facing a couple of Goombas and a Koopa Troopa below a row of ? Blocks. Between the two pipes with Piranha Plants and another Koopa Troopa is a Hidden Block with a 1-Up Mushroom, and in the right-most block in the row of Brick Blocks ahead is a Coin Block. In the right-most ? Block above two Koopa Paratroopas is a power-up. To reach a Beanstalk that leads to Coin Heaven, the player has to hit two Hidden Blocks directly to the right of the pipe with a Piranha Plant, and break the Brick Blocks while in Super form. Coin Heaven will drop the player directly after the pipe on top of ? Blocks positioned afterward. In the center of the top row of Brick Blocks is a Super Star, and in the right-most ? Block after the Super Spring (Springboard in All-Stars) is a power-up. In the center ? Block afterward is a Poison Mushroom, and after platforms with Koopa Troopas, Koopa Paratroopas, Piranha Plants, and Goombas is the Goal Pole.

Enemies

Image	Name	Count
	Goomba*	7
	Green Koopa Troopa	9
	Red Piranha Plant	8
	Green Koopa Paratroopa	6

^* - In Super Mario All-Stars, all Goombas in the letter worlds are replaced with Buzzy Beetles.

Items

Course icon

Image	Name	Count	Note(s)
	Coin	93	23 in ? Blocks, 5 in Hidden Blocks, up to 10 from one Coin Block, and 55 in open air in the Coin Heaven.
	Mushroom/Fire Flower	2
	Star	1	Hidden in a Brick Block.
	1-Up Mushroom	1	Hidden in an invisible block in between the first and second pipes.
	Poisonous Mushroom	1	Hidden in a ? Block.

Level maps

File:NES LL World B-1 Map.png

Map of World B-1

File:SMAS LL World B-1 Map.png

Map of World B-1 (Super Mario All-Stars version)