South Park Cheats

Enter the options menu, click on the lower left corner of the screen, then enter one of the following codes to activate the corresponding cheat function:
Result
Cheat Code
Invincibility BEEFCAKE
All weapons with infinite ammo SWEET
Big head mode [Note] EGOTRIP
Display frame rate FRAMERATE
Note: This code only works in single player mode.
-From: nightmare_52@hotmail.com and IHveNoSoul@aol.com

Press [Esc] during game play and select "Options".
Then, click in the lower left corner and enter one of the following
codes to activate the corresponding cheat function. Note: Some
cheats are only available in single player mode.

Code
Big enemy heads egotrip
Invincibility beefcake or cheesypoofs
All weapons with unlimited ammo sweet
Display frame rate framerate
Enable all codes bobby bird

Go to the cheat menu and type `BUTTERS'. After doing so, start the game. Next time when selecting your character you will see the normal characters 'Cartman', 'Kyle', 'Stan' and 'Kenny', but Butters well appear
at the end of the row next to Kenny.