Editing Back Door

{{levelbox
|title=Back Door
|image=[[File:SMW BackDoor.png]]
|code=BD
|game=''[[Super Mario World]]''
|notes=The Back Door is a shortcut for the Front Door. This area is the only area in the game that [[Ninji]]s may be found.
|before=[[Valley Fortress|<<]]
|after=>>
}}

[[Image:Back_door.png|frame|left|The Front Door on the left and the '''Back Door''' on the right.]]

'''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.

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

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 Von Koopa]]. A similar reference is made in ''[[New Super Mario Bros. U]]'' (and as such, ''[[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 red [[Switch Block]]s to get behind the castle.
{{br|left}}

==Enemies==
*[[Ninji]]s
*[[Mecha-Koopa]]s

==Names in other languages==
{{foreignname|
|Jap=クッパのしろうらぐち
|JapR=Kuppa no Shiro Uraguchi
|JapM=Koopa's Castle Back Door}}

==Trivia==
*In the [[Game Boy Advance]] remake of ''[[Super Mario World]]'', even if the player defeats [[Bowser]], it is impossible to exit this level without quitting the game.
*If ''Super Mario Advance 2: Super Mario World'' is played on a backlit Nintendo handheld (such as a [[Game Boy Advance SP]] or [[Nintendo DS Lite]]), the background in the dark section of the level will be so bright that the red ? block light is actually not needed to complete the level. This is because those systems are backlit and this game was intended to be played on a non-backlit Game Boy Advance.
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{{SMW Levels}}
[[Category:Levels]]
[[Category:Castles]]
[[Category:Bowser's Castles]]
[[Category:Subterranean Areas]]
[[Category:Secret Levels]]
[[Category:Volcanic Areas]]