Boss Door

Boss Door
Game(s)	Newer Super Mario Bros. Wii Newer Super Mario Bros. DS Another Super Mario Bros. Wii Newer: Holiday Special Newer: Summer Sun Newer: Falling Leaf
Type	Door
Function	Transports the player to a boss room.
Related objects	Warp Door
First apearance	(Wii) Timber Tower (DS) Ropeblast Tower (AN) World 1- (Hol) World 1- (Sun) World 1- (Fall) Tetromino Switch Palace
Final appearance	(Wii) Bowser's Keep (DS) Bowser's Castle (AN) World 9-8 (Hol) World 1- (Sun) World 8- (Fall) Tetromino Switch Palace

Boss Doors are special doors found throughout the Newer Super Mario Bros. series. They're found at the end of most towers and castles and often lead the player to the level's boss.

Appearance

Boss Doors have varying designs not only across their different appearances among games, but also across individual levels within said games. Do note that regular Warp Doors leading to a boss room aren't considered proper Boss Doors.

In Newer Super Mario Bros. Wii, Another Super Mario Bros. Wii, Newer: Holiday Special, and Newer: Summer Sun, average Boss Doors are blue metal doors spanning five blocks with golden handles.

In Bowser's Keep in Newer Super Mario Bros. Wii, as well as World 8- and World 9-8 in Another Super Mario Bros. Wii, special green seven-block Boss Doors with golden handles appear.

In Newer Super Mario Bros. DS, proper Boss Doors are red three-by-three square doors with black edges and yellow handles. An edge-on variation of them can also be found in this game's Bowser Castle.

Behavior

Boss Doors act identically to normal Warp Doors. They're set in place at the end of most towers and castles. If the player presses up in front of them, they'll open, allowing the player to reach a new area, which is often the level's boss. Boss Doors cannot be reentered.

In Newer Super Mario Bros. DS, certain Boss Doors are replaced with standard Warp Doors or Warp Pipes, though they serve the exact same purpose.