Cheat mode
Enter the options screen and highlight "Controls" Press [Start], then exit the options screen, then press [Start] to begin game play. Level select, music select, and player select options will appear.
Debug mode
Enter "NYUKNYUK" as a password and press [Start] immediately after the last letter is entered. The text "Second Controller Enabled" will appear to confirm correct code entry. Then, go to the options screen, highlight "Controls" and press [Start]. Next, start the game at the "Start" selection. Use the following actions to enable the corresponding cheat. Note: Level select is enabled by default when game play begins.
Walk through walls
Press the D-Pad on controller two.
Full life and ammunition
Press [B] on controller two.
Slow motion
Press [A] on controller two.
Disable cheat mode
Press [Start] on controller two.
Additional options
All weapons
Enter "4VTNVVTI" or "4VTNVVIT" as a password. All of the weapons will be available with the ammunition set to 99, except for missiles which will be set to 91.
Enter "WAGNER93" as a password to have all weapons and ammunition.