To use these cheat codes you will have to follow these directions.

Cheat Codes:

Load the game with the "-debug" command line parameter. Then while playing as the indicated character, press ~ and enter one of the following case-sensitive codes to activate the orresponding
cheat function. Note: Enabling cheats will disable saving the game.

MOTIONTRACKERVOLUME Change motion tracker volume for Marine
MOTIONTRACKERSPEED Change motion tracker speed for Marine
GIMME_CHARGE Replenish energy supply for Predator
CROUCHMODE Toggle crouch and crawl Alien
GOD God mode Any
GIVEALLWEAPONS All weapons and ammo Any
MARINEBOT Create CPU controlled Marine
PREDOBOT Create CPU controlled Predator
ALIENBOT Create CPU controlled Alien
PREDALIENBOT Create CPU controlled Predator-Alien
PRAETORIANBOT Create CPU controlled Praetorian Alien
XENBORG Create CPU controlled Xenoborg
LIGHT Create light aura; repeat for brighter aura
SHOWFPS Display frame rate
SHOWPOLYCOUNT Display number of rendered polygons
LISTVAR List in-game help
LISTCMD List cheat commands

Change game speed:

Note: Creating CPU controlled characters may crash the game if that character does not normally exist in the current level. Use the "Load species" code below to force the game to have the desired character type.

Load species:

Start the game with the "-debug -l[ampcxtr]" command line parameter, where a is the alien, m is the marine, p is the predator, c is the civilian, x is the xenoborg, t is the praetorian
alien, and r is the predator-alien. Note: All letters are case-sensitive.