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To use the following cheats start the game with the command-line parameter +set console 1. Then while you are playing ~ and type 'cheats on' to enable cheat mode. Then you can use any of the following cheat codes just by typing them in the console.
god = God Mode
bigelbow = Get all weapons
notarget = makes you invisible
noclip = Activates no clipping mode.
weapon_give_[X] = Gives you any weapon, X = 1-10, the # of the desired weapon.
health[X] = X = how much health you want
map [x] = X is the name of the level you want to travel too
g_unlimited_ammo 1 = unlimited ammo
timescale [x] = Changes the speed of the game. 1.0 is normal
