Press T during game play, then type one of the following codes to activate the corresponding cheat function.

Effect	Code
All armor options	mpyoulooklikeyouneedamonkey
All maps	mpbeenthere
All weapon upgrades	mpgoattech
All weapons and full ammo	mpkingoftehmonstars or mpmimimi
All weapons, ammo and items	mpsanta
Current mission completed	mpmaphole
Exit game	mpmiked
God mode ( see Note )	mpimyourfather
Gore mode	mpexorbitantamounts
Ohio teaser	mpgod
Paintball mode	mpflowerpower
Press [Keypad Plus] to return to start of level	mpteleport
Remove all AI players	mpboyisuck
Restore armor	mpwonderbra
Restore health	mpdrdentz
Show game version	mpbuild
Spawn motorcycle	mpracerboy
Spawn snowmobile	mprosebud
Temporarily invisible to the camera	mpcam
Third person view	mpcamera
Toggle invisibility	mpwhoami
Toggle position display	mppos
Toggle third person view	mpasscam
Trigger all activate boxes	mptriggers
Unknown effect	mphookmeup
Unknown effect	mpcampos
Unknown effect	mpbreach
Unknown effect	mppoly
Unknown effect	mpfov
Unknown effect	mplightadd
Unknown effect	mplightscale
Unknown effect	mpwmpos
Unknown effect	mpwpos
Unlimited ammunition	mpwegotdeathstar
Walk through walls	mpclip

Note: This code only affects the current level and must be re-activated with each new level.