Cheat mode:
Pause game play and press Left + A, B, X, A(2), B, X, A, Start. An option and information screen will appear allowing cheat mode (invincibility), level selection, pausing without a dim screen, or viewing the entire level. Note: Enabling this code may prevent completion of the game.

Level skip:
Pause game play and press A, B, X, A, A + X, B + X, B + X, A + X. Resume game play to start at the next level.

Wrong cheat code:
Pause game play and press Y, A, B(2), A, Y, A, B(2), A.

Eight plasma shots:
Pause game play and press A(2), B + L, A(2), X, B + L, X.

Extra continue:
Pause game play and press A, B, A, B, X, Y, X, Y.

Full ammunition:
Pause game play and press A, B, B + L, B, X, A, X(2).

Extra life:
Pause game play and press B + X, B(3), A(2), X, A.

Jump to Princess:
Pause game play and press Left + A, X(2), X + B, X, A, X, Left + A.

Full energy:
Pause game play and press A + X, B, A, B(2), X + Y, B, A.

Map view mode:
Pause game play and press A, X, A, X, A(4).

Level codes:
Pause game play and enter one of the following controller actions to jump to the corresponding level:

Level Code

What The Heck
Press Y, X, Y, X, A, B, A, X

Down The Tubes
Press Up, Down, Left + Down, Left, Down, Down, Up + Left, Down

Snot A Problem
Press A, B, X, B, A, B, B, B + L

Level 5
Press A + B, B + X, X + Y, Left, Left, Right, Left, Right

For Pete's Sake
Press A, B, X, A, B, X, A, B + R

Buttville
Press A, X, Left, Left, X + Y, Up, Down, Left

Andy Asteroids
Press A + L, A, R + A, A, B, B, X, B

Who Turned Out The Light?
Press A, B, Up + Y, Up + Y, Left, Right, Left, Right