New Super Mario Bros.
>>Cheat Codes, Hints, Tips, and Unlockables<<

Resources: Buy the Game | Cheat Codes | Game Guide | Screenshots
 

 

CHEAT CODES | Play as Luigi (Single Player Mode)

While at the Select A File screen, hold L and R and choose a saved game file. 

CHEAT CODES | Secret Challenge Mode

Pause the game to get to the Map, and press L, R, L, R, X, X, Y, Y.