During gameplay, press ENTER, type in one of the cheats again, then press ENTER again to activate it.

Achieve objectives - cisco
All inventory items - refill
Become invisible - shadow
Change your kit to specified file: kit (kit file)
Chicken grenades - chickenrun
Disable shaky screen - rumbleoff
Don't show corpse names - hidecorpse
Enable shaky screen - rumbleon
Exit game - quit
God mode - superman
Lose mission - autolose
Mark location on map for teleport - mark
Mark location on map for teleport - mark2
Paintball mode - extremepaintball
Report current location - loc
Run - run
Screen shakes - boom
Set gamma - setgama (0.0-1.0)
Show object names - names
Show texture properties for objects - showtextureprops
Squirrel launcher - squirrelkite
Suicide - god
Take over enemy bases - rock
Team God mode - teamsuperman
Team invisibility - teamshadow
Teleport - teleport
Teleport to preset locations - spawn
Toggle AI - toggleai
Toggle display of tracers - tracers
Toggle effect stats - toggleshoweffectsstats
Toggle framerate display - toggleshowframerate
Toggle freezing trees - togglemovetrees
Toggle interface stats - toggleshowinterfacestats
Toggle level stats - toggleshowlevelstats
Toggle performance counters - toggleshowperfcounters
Toggle system memory stats - toggleshowsystemmemorystats
Toggle texture memory stats - toggleshowtexturememorystats
Toggle total stats - toggleshowtotalstats
Toggle user interface - toggleui
Unlimited ammunition - ammo
Unlock Hero characters - unlockheros
View debug counters - perf
Win current mission - autowin