Quake 4 PC Cheats

       In game press Ctrl+Alt+~ and type: 
     
God = God Mode
give all = All weapons, full ammo, health and armor 
noclip = Walk through solid objects
notarget = Invisibility to most enemies
kill = suicide 
killmonsters = Kills all Monsters 
give ammo = Max Ammo
give health = Max Health
give keys = All keys