While playing a game, press [Enter] to display the communication window. Then, 
enter one of the following codes to activate the corresponding cheat function:

Result - Cheat Code
Selected character is invincible - avatargod 
Team invincible - teamgod 
Team invisible - teamshadow 
Invisible mode - theshadowknows 
Refill ammunition - 5fingerdiscount 
Fart when walking - silentbutdeadly 
2D players - turnpunchkick 
Heavy breathing - 1-900 
Toggle victory conditions - explore 
Disable AI - nobrainer 
Wounding shots kill - wounddeath 
Monocle mode - monocle 
Clodhopper mode - clodhopper 
Mega head mode - meganoggin 
Big head mode - bignoggin 
Stumpy mode - stumpy 
Activate debug keys - debugkeys 
Commit suicide - death 
Map draw AI normal colors - normalcolors 
Map draw AI panicked colors - panickedcolors 
Map draw AI ROE colors - roestatecolors 
Map draw AI ROE speed colors - roespeedcolors 
Map draw AI combat state colors - combatstatecolors 
Map draw AI behavior colors - behaviorcolors 
Map draw AI psycological state colors - psychstatecolors 
Map draw AI threat awareness colors - threatawarenesscolors 
Map draw AI aware colors - awarenessstatecolors 
Map draw AI alertness colors - alertnessstatecolors 
Map draw AI plan colors - aiplancolors 
Map draw level maps - levelmaps 
Map draw test plan - testplan 
Map draw plan - drawplan 
Map draw path point links - pathpointlinks 
Map draw cover points - coverpoints 
Map draw path points - pathpoints 
Map draw object walls - objectwalls 
Map draw obstacle walls - obstaclewalls 

Debug commands -
Enable the "Activate debug keys" code and press [F10] to enter debug mode. 
Then, press one of the following keys to activate the corresponding debug 
function:

Result - Key
Screenshot - [F2] 
Change view - [F6] 
Commit suicide - [F7] or [F8] 
Return to normal view - [F9] 
Exit debug mode - [F10] 
Level skip - [F12] 
Adjust lighting - [ or } 
Toggle AI - A 
Third person views - V or B 
Adjust elevation - [Comma], [Period], or /