Enter these at the cheat menu, then in the game the codes will be automatically active:
Enter the following codes and a sound will confirm correct entry:
All Weapons: charliehustleoverdressedromeo
Big Feet Mode: deadredpartyshoes
Big Head Mode: buttcheatcansurprise
Enemies Thwarted or Frozen: charlieoscarlimadelta
Full Map: yesterdayyourzebradivorced
God Mode: nopainnocane
Level Select: coollevelcheatcode
Level Up Weapons: friendliestgodingalaxy
Programmer Message: goodgodhelpme
Restore Health: canereadytorock
Skip Level: yesterdayyourzebradie
Time Factor: charliealphanovemberecho
Unlimited Ammo: fishinabarrel
Unlock Doors: anyandallcode