Editing Back Door

{{level infobox
|image=[[File:SMW BackDoor.png|256px]]<br>Mario facing a Ninji and a Mechakoopa
|code=7-BD
|world=[[Valley of Bowser]]
|game=''[[Super Mario World]]''
|limit=400 seconds (SFC/SNES)<br>600 seconds (GBA)
|boss=[[Bowser]]
|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]]''. It is similar to the [[Front Door]] of [[Bowser's Castle]] but skips over the majority of the level, starting at the "[[dark]]" room. The eight doors are skipped entirely, making Bowser's Castle much easier. The only difference in the "dark room" from the Front Door path is a [[Midway Gate]] just before the fight to [[Bowser]]. The battle with Bowser is unchanged, as is the credits and ending scenes. This level and the Front Door are both counted as the same exit, and as such, the player is only required to complete one of them to achieve 100% [[completion]].

It can be accessed through a secret path in the Valley of Bowser, specifically after the completion of the level [[Valley Fortress]].

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

==Names in other languages==
{{foreign names
|Jap=クッパのしろうらぐち
|JapR=Kuppa no Shiro Uraguchi
|JapM=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
}}

==Trivia==
*The game's bright palette in the remake makes it so that the red ? block light is not required 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:Dinosaur Land]]
[[Category:Secret levels]]
[[Category:Underground areas]]
[[Category:Volcanic areas]]
[[Category:Super Mario World levels]]