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 corresponding cheat function. Note: Enabling cheats will disable saving the game.

RESULT CHARACTER CHEAT CODE
Change motion tracker volume Marine MOTIONTRACKERVOLUME [0.00-1.00]
Change motion tracker speed Marine MOTIONTRACKERSPEED [0-16]
Replenish energy supply Predator GIMME_CHARGE
Toggle crouch and crawl Alien CROUCHMODE [0 or 1]
God mode Any GOD
All weapons and ammo Any GIVEALLWEAPONS
Create CPU controlled Marine [Note] Any MARINEBOT [class number]
Create CPU controlled Predator [Note] Any PREDOBOT [class number]
Create CPU controlled Alien [Note] Any ALIENBOT
Create CPU controlled Predator-Alien [Note] Any PREDALIENBOT
Create CPU controlled Praetorian Alien [Note] Any PRAETORIANBOT
Create CPU controlled Xenoborg [Note] Any XENOBORG
Create light aura; repeat for brighter aura Any LIGHT
Display frame rate Any SHOWFPS
Display number of rendered polygons Any SHOWPOLYCOUNT
List in-game help Any LISTVAR
List cheat commands Any LISTCMD
Change game speed Any TIMESCALE [0.0-1.0]

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.