Cheat codes

Effect - Code
Achilles Head - CARDINAL
All Replay Items - BOXFISH
Bullet Shield - WRASSE
Invincibility - BANNER
Invisible Soldiers - PARROT
Men with Hats - DOTTYBACK
Rubber Grenades - BETTA
Silver Bullet - BATFISH
Unlimited Ammo - JAWFISH
Unlock All Missions - TUSKFISH