Note: The following codes are only available after you install 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, activate the following cheats by entering the corresponding codes:

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

Note 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.

Begin the game with the avp.exe -debug -l 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.

Unlock the following cheats by performing the corresponding tasks:

CHEAT FUNCTION - HOW TO UNLOCK
BALLSOFFIRE - Complete the Predator level, Fury 161, with 40 Alien kills. This cheat makes your enemies always on fire.
GRENADE - Complete the Marine level, Colony, with 40% percent accuracy. This cheat stocks your Pulse Rifle with 99 grenades.
IMPOSSIBLEMISSION - Complete the Alien bonus level with 20 live Marine head bites. This cheat causes you to take more damage.
JOHNWOOMODE - Complete the Marine level, Derelict, with 80% head shots. This cheat slows the game when you attack or are attacked.
LANDOFTHEGIANTS - Complete the Marine level, Orbital, using less than 20 shots. This cheat makes you very small
MIRROR - Complete the Alien level, Earthbound, with one live Predator head bite. This cheat mirrors the level display.
MOTIONBLUR - Complete the Alien level, Gateway, in under 4.5 minutes with an average speed of 9 m/s or better. This cheat makes the screen blurry.
NAUSEA - Complete the Alien level, Escape, in less than two minutes. This cheat shakes and moves the screen.
PIGSTICKING - Complete the Predator level, Waterfall, with 80% accuracy. This cheat gives the Predator's Spear gun unlimited ammo and multi-fire.
PIPECLEANER - Complete the Alien level, Ferarco, with 15 dead civilian head bites. This cheat shows all characters as pipe cleaners.
SLUGTRAIL - Complete the Marine level, Tyrargo, with 32 Alien kills. This cheat causes all Aliens to have no legs.
SNIPERMUNCH - Complete the Alien level, Temple, with 10 live civilian head bites. This cheat gives Aliens a long distance jaw attack.
TICKERTAPE - Complete the Predator bonus level, Invasion, with 15 alien trophies. This cheat causes Aliens to have a trail following them.
TRIPTASTIC - Complete the Predator bonus level, Escape, with 10 civilian trophies. This cheat causes the screen to become blurry, jittery, and rainbow-colored.
WARPSPEED - Complete the Marine level, Orbital, using less than 20 shots. This cheat allows you to run very fast.