This guide will show how to get to secret levels along with the demon artifacts in the levels.
How to access Outpost Omega from Holding Area
At the end of the fourth level, Holding area, press each switch in the order of 3,1,2,4.
Then kill all the lost souls that spawn, turn around, and enter the door.
Run across the pillars and to the exit room.
Outpost Omega – First demon artifact location + Unmaker location
At the very start of the level when you open the first door, turn right and press the computer panel then run to the back wall to the opened door with the red key (you will need the red key for later)
Later in the level once you’ve gone through the blue door, drop down then turn left and drop down.
Turn right and run onto the next platform. After that, kill the enemy that spawned across from you, turn left 90 degrees and face the wall. Press the wall, shoot the button across from you, and grab the unmaker. Also be prepared for the enemy that spawns on the right.
Now to get the demon key. Run to where the enemy spawned, press the switch, and turn around. a lift has lowered. Go onto the lift and a button will appear on the wall opposite from the lift. Shoot it.
After that, run back to the platform (the one where you got the unmaker), turn 90 degrees to the right, step forward and a wall will lower with a backpack and another enemy. (If you want the backpack and armor, you can straferun to get them).
Kill the enemy and run back to the platform with the switch press it again. The same lift has lowered. Go to the lift and the same button will appear on the wall opposite from the lift. Shoot it. After that, run back to the platform on the left and the floor in front of it lowered. Drop down, turn right and open the door. The door has the first demon artifact. (You will need the red key from earlier to open the door)
How to access The Lair from Altar of Pain
In the twelfth level, Altar of Pain, play through the level until you get the yellow key. Once you have the yellow key, run across onto the platform that looks like an arrow with the soulsphere on it. The arrow is pointing to a fake wall. Run off the arrow and into the fake wall. Kill the enemy guarding the exit and then take the exit.
The Lair – Second demon artifact location
This one is probably the easiest to get. Once you’ve killed the imps and arachnotrons, step onto the platform shown in the image.
Shoot the button that has been opened then turn 90 degrees left and shoot the other button that was revealed. Then run and get the demon artifact that lowered.
How to access In the Void from Spawned Fear
In the eighteenth level, Spawned Fear, right before the end of the level, step to the top of the stairs, turn around and run back out the yellow door, turn left, then left again, and into the opened door with the secret exit.
In the Void – Third demon artifact location
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