Press ~ during game play to display the console window. Enter one the following codes then press [Enter] to activate the corresponding cheat function.

Effect	Code
Disables No clipping mode	walk
Flight mode	fly
Maximum ammunition	allammo
No clipping mode	ghost
Set the gravity	setgravity [number]
Set speed; disabled after zedtime	slomo [number]
Toggle god mode	god
Toggle third person view	behindview [0 or 1]