At the title screen or while the game is paused slowly press 3666.
Then select “Cheats” option
Code Effect 3666 activate the cheat menu
Contributed By: angels_blade.
New cheat codes discovered!
Doom RPG Hidden Cheat Codes: Use codes 43629 or 4332 during game play mode.
Code Effect 43629 Health & Armor! 4332 Weapons & Ammo!
Contributed By: Gerardo194.
Bonus Area (In Destroyed Junction)
The Bonus Area is located behind a secret wall. Search the upper-left walls of the large cave area in the Destroyed Junction. It has a 7-digit password which happen to be the first seven numbers in the famous Fibonacci Sequence.
Inside can be found three enemies (Baron, Revanant, Apollyon). The floor is covered with Berserker and Soul Sphere power-ups, a dog collar, a Flak Jacket, and large amounts of ammo for every gun.
Password Effect 0112358 Opens Bonus Room
Contributed By: ForsakenInhibit.
Super Secret Password
If you go through the game and collect all the super secret password clues, you will be able to enter the super secret room which is in level 6.
Password Effect 2279 Enter the super secret room
Contributed By: Mykal73.
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You can submit a problem report for any non-working or fake code in the lists above.