Note: The following codes are only available after installing the patch that gives the game a saved game feature. Start the game with the -debug command line parameter. Press ~ during game play to display the console. Then, enter one of the following case-sensitive codes while playing as the indicated character to activate the corresponding cheat function.

Effect: Character: Code

Create CPU controlled Alien: Any: ALIENBOT
All weapons and ammo: Any: GIVEALLWEAPONS
God mode: Any: GOD
Create light aura; repeat for brighter aura: Any: LIGHT
Create an CPU controlled Marine: Any: MARINEBOT
Player invisible to all opponents: Any: OBSERVER
Create CPU controlled Predator1: Any: PREDOBOT
Create CPU controlled Predator-Alien1: Any: PREDALIENBOT
Create CPU controlled Praetorian Alien1: Any: PRAETORIANBOT
Create CPU controlled Xenoborg1: Any: XENOBORG
Display level coordinates: Any: SHOWCOORDS
Display frame rate: Any: SHOWFPS
Display number of rendered polygons: Any: SHOWPOLYCOUNT
Replenish energy supply: Predator: GIMME_CHARGE
God mode: Marine: FREAKOFTHEUNIVERS
God mode: Predator: SKULLCOLLECTOR
God mode: Alien: THEONEDEADLYCREAUTUREEVERCREATED
Kill all Marines: Any: NUKEMARINES
Kill all Aliens: Any: NUKEALIENS
Kill all Predators: Any: NUKEPREDS
List in-game help: Any: LISTVAR
List cheat commands: Any: LISTCMD
Change motion tracker volume: Marine: MOTIONTRACKERVOLUME <0.00-1.00>
Change motion tracker speed: Marine: MOTIONTRACKERSPEED <0-16>
Toggle crouch and crawl: Alien: CROUCHMODE <0 or 1>
Change game speed: Any: TIMESCALE <0.0-1.0>
Toggle wire frame mode: Any: WIREFRAMEMODE <0 or 1>
Toggle doppler shift on: Alien: sounds Any DOPPLERSHIFT <0 or 1>
Adjust amount of red in sky: Any: SKY_RED
Adjust amount of green in sky: Any: SKY_GREEN
Adjust amount of blue in sky: Any: SKY_BLUE
Adjust amount of tilt when sidestepping: Any: LEANSCALE
Verbose reports of text expansions: Any: EXPV
List all text expansions: Any: LISTEXP
List all key bindings: Any: LISTBIND
Clear all key bindings: Any: UNBIND-ALL
Broadcast message: Any: SAY
Broadcast message to your species: Any: SAY_SPECIES
Stop playing CD track: Any: CDSTOP
Select CD track to play: Any: CDPLAY
Select CD track to be looped: Any: CDPLAYLOOP
Set sound level: Any: CDVOLUME <0-127>
Get name of player nearest center of screen: Any: ID_PLAYER
Show frag table: Any: SHOW_SCORE
Screenshot: Any: SCREENSHOT
Toggle network opponent movement: Any: EXTRAPOLATE_MOVEMENT
Increases detail level: Any: DETAIL_LEVEL_MAX
Decreases detail level: Any: DETAIL_LEVEL_MIN

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