god	God mode, which makes you invulnerable.
impulse 9	Gives you all weapons plus full ammo.
fly	Allows you to fly around the level.
map ##	Level Warp (in the format 13, where "1" is the episode and "3" is the level number)
kill	Suicide (handy if you get stuck where you shouldn't be in god mode!)
noclip	Toggles clipping (walk-thru-walls) mode.