Head to the extras section of the main menu and insert the following code, which will give each of your characters infinite power: Plus, Left, Right, Plus, Minus, Z.
To unlock all cliches in the game automatically, head to the in-game Extras menu and insert the following button combination: Left, Minus, Right, Plus, Right, Z.
Insert the following code at the in-game extras menu to unlock all of the game’s levels automatically: Left, Left, Right, Right, Minus, Plus. (unverified)
To unlock all in-game movies, head to the Extras menu and insert the following password: Minus, Left, Minus, Right, Plus, C.