Earthworm Jim

Any time during the game, pause it and press A and Left, B, B, A and Right, B, B, A. Unpause the game, and the words 'Cheater!' will appear on the screen. Up comes a menu which lets you select your level, give yourself infinite energy and check the map of any level.

Press START to pause then enter one of the following codes:

Plasma Shot Weapon: C, A, B, C, A, B, A, C
Earn one continue: A, B+Left, A, B, A, B, C, A
Fill weapon to 1,000 rounds: A, B, B, B, C, A, C, C
One free guy: B, B, C, C, A, A, A, A

Pause and enter the following:

A + Up, B, A, C, A, A, C, B

At any time, pause the game and press B and Up simultaneously, then press B, A, C, A, A, A, A. You will hear Earthworm Jim say ''Cheater! Wheee Doggy!.'' When you unpause the game, you will see that you now have an extra life. You can perform this code as many times as you want.