Cheat codes: Press the key to bring up console, then enter the cheats.
Cheat.GodMode - Godmode
Cheat.AddAmmo - 500 Ammo
Cheat.FullHealth - 100 Health
Cheat.GiveAllWeapons - Give All Weapons
Cheat.GiveAllAmmo - Give All Ammo
Cheat.NextMission - Advance to next mission