Editing World B-4

{{image|more=yes|Needs in-game screenshot from the original FDS version}}
{{distinguish|Level B-4}}
{{Levelbox
|title=World B-4
|image=[[File:SMAS LL World B-4 Screenshot.png]]
|code=World B-4
|world=[[World B]]
|game=''[[Super Mario Bros.: The Lost Levels]]''
|limit=300 seconds
|boss=[[Fake Bowser]] ([[Fire Breath|fire]], [[Koopa Troopa]])
|before_alt=
|before=[[World B-3|<<]]
|after=[[World C-1|>>]] [[World D-1|<sup>>></sup>]]
|secret=
|track=[[Shiro BGM|Castle Theme]]
|sample=[[File:SMB Castle Theme.oga]]
}}
'''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 Bar]]s 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 [[crouch]]ing 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 Pipe]]s 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]].
{{br|left}}

==Enemies and obstacles==
{{Number of enemies
|image1=[[File:SMBLL Red Piranha Plant.png]]
|name1=[[Piranha Plant|Red Piranha Plant]]
|count1=6
|image2=[[File:FireRodSMB.gif]]
|name2=[[Fire Bar|Fire-Bar]]
|count2=7
|image3=[[File:SMB Bowser Breathing Fire Sprite.gif]]
|name3=[[Fake Bowser]] ([[Koopa Troopa|Green Koopa Troopa]])
|count3=1 (FDS boss)
|image4=[[File:SMAS SMB Bowser Sprite.png]]
|name4=Fake Bowser ([[Cheep Cheep]] (Green))
|count4=1 (SNES boss)
}}

==Items==
{{Item locations
|image1=[[File:SMBLL Super Mushroom Sprite.png]][[File:Fire Flower SMB.gif]]
|name1=[[Super Mushroom|Mushroom]]/[[Fire Flower]]
|count1=1
|notes1=
}}

==Level maps==
{{Wide image|NES LL World B-4 Map.png|4608|Map of World B-4}}
{{Wide image|SMAS LL World B-4 Map.png|4880|Map of World B-4 (''[[Super Mario All-Stars]]'' version)}}

{{SMBTLL levels}}
[[Category:Castles]]
[[Category:Super Mario Bros.: The Lost Levels levels]]