To activate cheats press ' in game and type them in:

Codes teamgod - Team God Mode

avatargod - Player God Mode

stumpy - Stumpy Mode

clodhopper - Enlarges Player's Feet and Hands

meganoggin - Mega Head Mode

bignoggin - Big Head Mode

5fingerdiscount - Refill Ammo

nobrainer - Turns AI Off

debugkeys - Debug Keys Enabled

silenbutdeadly - Flatulent walking

turnpunchkick - Changes Players from 3D to 2D

1-900 - Heavy Breathing

explore - Victory Conditions On/Off

Debug Mode  -  While playing, type " then type 'debugkeys'. To activate it hit ENTER, press F10, then press any of the following keys:

[F12] - Level skip
[F7] or [F8] - Suicide
[F6] - Change view
[Comma], [Period], or [/] - Adjust elevation

Become a traitor - On some levels, there are drop-offs with ladders leading down to a lower level. If you have a teammate with you, face the hole, and get him in front of you. Then, push him in. You will see him try to get back up, or take the long way back, and eventually get back to you.

Bring dead operatives back to life - If you are in a mission and some of your fellow operatives are killed, continue to complete the mission. When starting a new mission and the screen that asks if you want a default plan, do not select "Yes". Instead, click "No" and go on. When you reach the character selection screen, go down to the bottom right corner and you should see the "Save Plan" and "Load Plan" options. Click on "Load Plan" and select the one that reads "m**", where * is a number that corresponds to the mission (for example, m1, m2, m3, etc.). Look at the characters in the box that contains the ones selected for the mission. If you see one of the dead operatives in that box, do not remove him or her -- just start the mission. After this, you should have that operative with you alive and well.