All Characters in Multiplayer Mode
To enable all characters in multiplayer mode, enter the password OMGTKKYB. That, as any South Park fan will know, stands for "Oh My God, They Killed Kenny! You Bastards."
For all weapons, enter the password FATKNACKER.
Big Head Mode
For big head mode enter the password MEGANOGGIN at the Cheat menu.
To access these characters in multiplayer mode, enter one of the passwords below.
For god mode enter the password ASSMAN.
To choose your starting level enter the password THEEARTHMOVED. After activating this code, start a new game and pause it. You may now enter the Level Select menu.
Pen and Ink Mode
For Turok's famous "pen and ink" mode, enter the password PLANEARIUM.
For unlimited ammo, enter the password FATTERKNACKER.
To view the credits, enter the password SCREWYOUGUYS.
To unlock all codes at once, enter the code BOBBYBIRD at the Cheats menu.