6 Oct 2006, ID#9693 Regular cheats
These are the regular cheats found in Half-life:
God = Invincible on/off
Notarget = NPC's can't see you (Invisible on/off)
Impulse 101 = Spawn all weapons, ammo, a hazard suit and a battery
Noclip = No clipping (can fly and phase through walls)
Kill = Suicide
Note: You don't need to use capitals while typing in the cheats.