Before using the cheat codes you must activate the cheat system.
 Simply follow these easy steps:
 
 1) At the Select Difficulty Level screen hold down the TAB key and
 press the CTRL key.
 
 2) At the Select Player screen type: robisagod You should hear a
 sound effect. Cheat mode is now active!
 
 3) To turn on any of the following cheats, type the cheat name while
 in the game.
 
 Invincibility ---- BEAGLE
 Blood Code ---- GIVEBLOOD
 Rescue All Hostages ---- RESCUE
 Warp To The Next level ---- GETMEOUT
 Display Hidden Areas ---- INFRARED
 Turn On All Weapons ---- KICKASS
 Cut To The End Game Scene ---- GEEWHIZ
 
 Easter Eggs
 Secret Marine:
 Hidden in the game is a secret character called Agent Squiggly. To
 play as Squiggly type SQUIGGLY at the Select Player screen and press
 the up arrow. Agent Squiggly is now ready for action!