Cheat codes for the full version:

            macleod - Immortality
            keymaster - Unlimited jet pack fuel.
            dirtyharry - Unlimited ammo.
            buzz - Glider wings
            framerate - Framerate counter
            phantom - Spy on creatures using the F11 and F12 keys.
            snipsnip - Change your player character's gender
            gohome - Reset to the start position.
            sneakers - Sneaker mode?
            thrasher - Thrasher mode - Shows all your enemies on radar.
            timewarp - Mission timer On/Off.
            weaponcam - Weapon optics display. Follows your fired rounds, like
            the cameras in smart bombs.
            singletrac - SingleTrac message.
            bigears - "Placeholder Sounds" On/Off?
            derek7 - Seems to work but no visible results.
            warpme - Mission warp? Possibly with an argumnet, as in "warpme dead"?
            jumpXXX - Jumps to the level inserted for XXX. In otherwords,  "jumpoasis"
            jumps to the Oasis level. Known levels that work are: Oasis, Anubis,
            Ragnarok, Juggernaut and Dead. Are there maybe secret levels? Like "jumpsecret"?
            bigbrother - Accepted as a cheat code but no visible effect. nocd -
            Accepted as a cheat code but no visible effect. baumer - Accepted as a cheat code but
            no visible effect. showall - Accepted as a cheat code but no visible effect.

            Cheat codes for the trial version:

            killer - Happy Trigger Mode
            macleod - Invincibility
            singletrac - Displays a message from SingleTrac
            All Combat Suits/Weapons - In the game menu, in multiplay, click on armory,
            then on suit. Click on the bottom suit, which I belive is combat.
            Then while it is highlighted press down, (the down arrow), you might take a couple
            tries to get it right. It also works for weapons.

            Cheat codes for the beta version:

            god - Invincibility
            tex - Happy Trigger Mode
 
 

            In Outwars from M'soft: for invincibility type 'singletrac' then
            'keymaster' then 'm' to get rid of the map. This works on the full
            beta version.
 
 

            In the first level of the main game you should find an outhouse.
            Open the door to the outhouse and do the code for all weapons. Then
            get a stick of Dynamite and throw it in the outhouse. There should
            be a place for you to crouch down. Go into the water and swim till
            you get to land. Follow the trail untill you find a big, round room.
            circle around it untill you find a window. Open the window and there
            will be two aliens about to saw open a cow!