Editing Back Door

{{level infobox
|image=[[File:SMW BackDoor.png|256px]]<br>Mario facing a Ninji and a Mechakoopa
|world=[[Valley of Bowser]]
|game=''[[Super Mario World]]''
|limit=400 seconds (SFC/SNES)<br>600 seconds (GBA)
|boss=[[Bowser]]
|notes=The Back Door is a shortcut in Bowser's Castle. This area is the only area in the game that [[Ninji|Mini-Ninja]]s may be found.
|before=[[Valley Fortress|<<]]
|after=>>
|track=[[Castle (theme)|Castle]]
|sample=[[File:Sub Castle Theme Super Mario World.oga]]
}}
[[File:Back_door.png|frame|left|The Front Door on the left and the Back Door on the right]]
The '''Back Door''' is a [[level]] in the [[Valley of Bowser]] in ''[[Super Mario World]]'' that is accessed by completing [[Valley Fortress]]. It is similar to the [[Front Door]] of [[Bowser’s Castle#Super_Mario_World|Bowser's Castle]] but skips over the majority of the level, starting in the [[dark]] room. The only difference in this room from the Front Door path is the inclusion of a [[Midway Gate]] just before the fight to [[Bowser]]. The battle with Bowser is unchanged, as are the credits and ending scenes. Because the game cannot be saved after completing the level (in the [[Super Nintendo Entertainment System|SNES]] version), it does not count toward 100% [[Completion#Super_Mario_World|completion]].

{{br|left}}
==Enemies==
*[[Ninji]]s: 6
*[[Mechakoopa]]s: 2
*[[Bowser]] (boss)
*[[Metal ball|Big Steelies]]

==Names in other languages==
{{foreign names
|Jpn=クッパのしろうらぐち
|JpnR=Kuppa no Shiro Uraguchi
|JpnM=Bowser's Castle Back Door
|Fre=Porte de derrière
|FreM=Back Door
|Ger=Seitentor
|GerM=Side Gate
|Ita=Porta sul retro
|ItaM=Back Door
|Spa=Puerta de Atrás
|SpaM=Back Door
}}

==Notes==
*The game's bright palette in the remake makes it so that the red ? block light is less necessary for the last part of the level, especially on devices with a bright backlit screen.
*In ''Super Mario World: Super Mario Advance 2'', even after the player defeats Bowser, it is impossible to leave the Back Door without quitting the game or losing a life.
*A reference to this level was made in ''[[New Super Mario Bros. Wii]]''. By taking a secret exit from the [[World 7 (New Super Mario Bros. Wii)|World 7]] tower and finishing the secret level, it is possible to go through a secret entry to the World 7 castle, skipping almost the whole level, except for the final [[Sledge Bro]] and the door to [[Ludwig|Ludwig von Koopa]].
**A similar reference is made in ''[[New Super Mario Bros. U]]'' (and ''[[New Super Luigi U]]''), where the player can take a shortcut (and the final [[Star Coin]]) in [[Roy's Conveyor Castle]]/[[Roy's Ironclad Castle]] by using [[! Switch|red switch block]]s to get behind the castle.

{{SMW levels}}
[[Category:Bowser's castles]]
[[Category:Secret levels]]
[[Category:Underground areas]]
[[Category:Volcanic areas]]
[[Category:Super Mario World levels]]