To teleport directly to the secret level, type "idclev19" while playing.

While playing, type any of these codes and have a blast.

• IDDQD -- Invulnerability
• IDBEHOLDI -- Temporary invisibility
• IDBEHOLDR -- Temporary radiation suit
• IDBEHOLDS -- Temporary berserk
• IDBEHOLDA -- Temporary automap
• IDBEHOLDV -- Temporary invulnerability
• IDBEHOLDL -- Temporary light
• IDKFA -- Full health, ammo, weapons, armor and keys
• IDFA -- Full health, ammo, weapons, and armor
• IDDT -- Change map detail
• IDCHOPPERS -- Gain chainsaw
• IDCLEVxx -- Warp to level 'xx' where xx is 01 to 19
• IDMYPOS -- Displays your position and bearing
• IDMUSxx -- Music select. 'xx' is the level who's song you want.
• IDSPISPOPD -- Walk through walls!