For the Big Heads code (single player only) go to the Options Menu, click in bottom left corner and type EGOTRIP.

Start a game as normal, then press "Esc" then click options. Click the lower-left corner of the screen and then type FRAMERATE to display the # of frames per second.

Start a game as normal, then press "Esc" then click options. Click the lower-left corner of the screen and then type "BOBBY BIRD" for unlimited ammo.

For infinite life, while in normal mode pause the game and go to options and click on the bottom left corner and type in CHEESYPOOFS for infinite life

In the game, when you see a dodge ball type: cartmanwantsball

To activate the Unlimited Ammo cheat, press [Esc] during a game and select Options. Then click the lower-left corner of the screen and type SWEET.

To activate the Infinite lives cheat, press [Esc] during a game and select Options. Then click the lower-left corner of the screen and type BEEFCAKE.