Reset the timer:
Note: This code requires a six button controller. Pause game play and press Left, Down, A, C, Down, Up.

Stop the timer:
Note: This code requires a six button controller. Pause game play and press Down, B(2), Up, Right, Left.

Sound test:
Note: This code requires a six button controller. Pause game play and press Up, Right, Left, A, Down, C.

Extra shields:
Select a two player game and play with a single player to gain one additional shield.

Extra weapons power:
Select a two player game and play with a single player. Set an auto-fire controller in port two to continuously press C.