Master cheat
Select the "Enter Cheat" option from the main menu. Enter "ZBOBBYBIRD" as a code to unlock all cheat features (all multi-player characters, invincibility, unlimited ammunition, all weapons, and level select) under the "Cheats" option. The name of the cheat will appear to confirm correct code entry. Note: Any cheats that are enabled can be saved during game play.

Chef in multi-player mode
Enter "YLOVEMACHINE" as a code.

Wendy in multi-player mode
Enter "BCHECKATACO" as a code.

Terrence in multi-player mode
Enter "SRAFT" as a code.

Phillip in multi-player mode
Enter "PPHAERT" as a code.

Ned in multi-player mode
Enter "JHAWKING" as a code.

Mr. Macky in multi-player mode
Enter "ACHEATINGSBAD" as a code.

Officer Barbrady in multi-player mode
Enter "DELVISLIVES" as a code.

Big Gay Al in multi-player mode
Enter "GOUTRANGE" as a code.

Starvin Marvin in multi-player mode
Enter "MSLAPUPMEAL" as a code.

Mr. Garrison in multi-player mode
Enter "VDOROTHYSFRIEND" as a code.

Pip in multi-player mode
Enter "EFISHNCHIPS" as a code.

Jimbo in multi-player mode
Enter "QSTARINGFROG" as a code.

Ike in multi-player mode
Enter "HKICKME" as a code.

Ms. Cartman in multi-player mode
Enter "KALLWOMAN" as a code.

Mephisto in multi-player mode
Enter "NGOODSCIENCE" as a code.

Alien Visitor in multi-player mode
Enter "TMAJESTIC" as a code.