To enter the following pause the game, select "Cheats," then "Enter cheat Code."

God mode:
NO, PAIN, NO, CANE

All levels:
COOL, LEVEL, CHEAT, CODE

All weapons:
CHARLIE, HUSTLE, OVERDRESSED, ROMEO

Big feet:
DEAD, RED, PARTY, SHOES

Big head:
BUTT, CHEAT, CAN, SURPRISE

Clear map:
YESTERDAY, YOUR, ZEBRA, DIE

Freeze enemies:
CHARLIE, OSCAR, LIMA, DELTA

Regain health:
CANE, READY, TO, ROCK

Infinite ammo:
FISH, IN, A, BARRELL

Level up weapons:
FRIENDLIEST, GOD, IN, GALAXY

Thanks to Revolution reader Sirius Black!