Cheats

You must type these cheats in the console. Activate console by pressing the ~ key.
(Hyphens (-) are not part of the cheat)

God- Makes you invincible.
Impulse 9- Gives all weapons.
Impulse 11- Get Ruins.
Impulse 255- Gives Quad Damage.
Noclip- Walk through things.
Map ExMd- Replace x with with episode. Replace d with level.
Fly- Fly around using c and d to go up or down.
Notarget- Monsters won't attack you unless you attack them.
Give #- Gives you weapon #.
Give S #- Gives you # shells.
Give N #- Gives you # nails.
Give R #- Gives you # rockets.
Give C #-Gives you # cells.
Give H #- Gives you # shells.