Hit pause during the game then select Cheats. Now enter the following codes:
Effect - Code
All Weapons - CHARLIE HUSTLE OVERDRESSED ROMEO
Big Head Mode - BUTT CHEAT CAN SURPRISE
Clear Map - YESTERDAY YOUR ZEBRA DIE
Big Foot Mode - DEAD RED PARTY SHOES
Control Time - CHARLIE ALPHA NOVEMBER ECHO
Freeze Enemies - CHARLIE OSCAR LIMA DELTA
Restore Health - CANE READY TO ROCK
Unlock All Doors - ANY AND ALL CODE
Unlock All Levels - COOL LEVEL CHEAT CODE
God Mode - NO PAIN NO CANE
Infinite Ammo - FISH IN A BARREL
Level Up Weapons - FRIENDLIEST GOD IN GALAXY
Programmer Message
Enter GOODGODHELPME as a code. A message will confirm correct code entry.