When playing press backspace then type any of these codes.

Code Effect:

CHOJIN God mode
ARMOR Full Armor
KILL Kill all monsters
AMMO Full ammo
KEYS Get all keys
INVISIBLE Invisible
WEAPON All weapons
FULLMAP Reveal entire map
Go # Warp to any level

More Cheat Codes:

These codes must be entered after the "chasm" command at the dos prompt.

Code Effect:

-nosound Turns off the game sound
-warp # Warp to level #