Head to the main menu and input BLUE, BLACK, WHITE, YELLOW, BLUE, BLUE, YELLOW. (Unverified)

To enable double damage, go to the main menu and press X, BLACK, X, Y, X, WHITE, X.

To enable level select, go to the main menu and press these buttons: X, BLACK, Y, BLACK, X, WHITE, Y.

To make yourself invincible, go to the main menu and press WHITE, X, Y, BLACK, X, Y, BLACK.

To turn on Cheat Mode, go to the main menu and press: X, Y, WHITE, BLACK, X, Y, X.