Select "Multiplayer" at the main menu, highlight the "Secret" option, then enter one of the following codes to activate the corresponding cheat function.

Effect	Code
Arcade Smash!	Press Square, Circle or Square, any button.
Arcade Stunt!	Press Square, X or Triangle, any button.
Hotseat Smash!	Press Triangle, Circle or Square, any button.
Hotseat Stunt!	Press Triangle, X or Triangle, any button.
Mono Screen Fun!	Press X, any button, X or Circle or Square.
Mono Screen Pro!	Press X, any button, Triangle.
Splitscreen Bonus Fun!	Press Circle, Circle, X or Circle or Square.
Splitscreen Bonus Pro!	Press Circle, Circle, Triangle.
Splitscreen Classic Fun!	Press Circle, X, X or Circle or Square.
Splitscreen Classic Pro!	Press Circle, X, Triangle.
Splitscreen Smash Fun!	Press Circle, Square, X or Circle or Square.
Splitscreen Smash Pro!	Press Circle, Square, Triangle.
Splitscreen Stunt Fun!	Press Circle, Triangle, X or Circle or Square.
Splitscreen Stunt Pro!	Press Circle, Triangle(2).