Newer Super Mario Bros. Wiki
Boss Key
Game(s) Newer Super Mario Bros. DS
Another Super Mario Bros. Wii
Newer: Summer Sun
Type Miscellaneous
Function Allows passage to the next world.
Related objects None
First apearance (DS) Flameburst Flotilla
(AN) World 1-Castlensmbw2.png
(Sun) World 1-Castlensmbw2.png
Final appearance (DS) Ironclad Battalion
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(Sun) World 1-Castlensmbw2.png

Boss Keys are special miscellaneous items found throughout the Newer Super Mario Bros. series. They appear after most end-world bosses, allowing access to the next world.


Boss Keys are large shiny golden keys with horns on their held end.


Boss Keys will jump out of most end-world bosses on their defeats (excluding Bowser and Dry Bowser), usually landing on the right side of the arena. On touch, the player will be able to open a door to the next room, often revealing Princess Peach being taken to the next world.