Press Keypad Enter to display the console window and enter one of the following codes:
Get all inventory items: refill
Change your kit to specified file: kit [file]
Chicken grenades: chickenrun
Disable constant shaky screen: rumbleoff
Enable constant shaky screen: rumbleon
Exit game: quit
Faster movement: run
God mode: superman
Hide corpse names: hidecorpse
Infinite ammunition: ammo
Invisibility: shadow
Lose current mission: autolose
Paintball mode: extremepaintball