Cheats

Hold [Ctrl] + [Alt] + [~] during game play to display the console window. Then, enter one of the following codes to activate the corresponding cheat function:
Code                    Effect
giveammo                Ammunition
notarget                Enemies can't see you
give all                Get everything
god                     God mode
givehealth              Health
kill                    kill's yourself
noclip                  Turn ghost mode on/off


Spawning Enemies

In console, these commands will spawn enemies
Code                    Effect
spawn monster_centurion Spawns a Centurion
spawn monster_fodder    Spawns a Fodder
spawn monster_hound     Spawns a Hound
spawn monster_hunter    Spawns a Hunter
spawn monster_mutate    Spawns a Mutate