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Here is a walkthrough of Tribulation if you get stuck!

If you haven't played it yet, please play first so you don't get any spoilers!!

Level 1

• Pickup the Pipe item
• Break the boarded up doorway
• Move through the enemies (kill is optional)
• Move passed the elevator door, around the corner.
• Move across the red colored lever in the center room to flip it.
• Exit through the now open elevator door.

Level 2

• Move to the lower left corner of the room
• Lower your sanity until you are insane (x button)
• Move through the now open doors, be aware of an enemy in the doorway
• Kill or avoid the Stumpy.
  • To kill the stumpy, move laterally to it to avoid the projectiles. Then hit it with the pipe to stun it and lay into it to kill it while stunned. Remember you do more damage when you are in the insanity mode.
• If you have healthkits, use them at this point to get become SANE.
• Continue forward, and pickup the pistol
• Move into the next room, be careful to not move in too fast and keep your distance as there are two Stumpy enemies
• Kill the enemies in the room with the pistol
• Go to the room in the top right, and flip the lever
• Continue forward in the level, killing enemies along the way
• Exit through the elevator to the right.

Level 3

• Move to the door north of you
• Lower your sanity to INSANE
• Go north and flip the lever
• While insane, move down through the level.
• Take the first right available, and continue right until you reach a very large opening.
• Shoot to the north a few shots, to aggro the Naked enemies one at a time and pick them off.
• Once you've killed a few, move up.
• Pickup all 3 healthpacks at the northmost side. DO NOT USE THEM. If you use a healthpack you will be teleported away, as this whole section is not real and losing INSANITY will revert it.
• Move to the right, keeping distance and killing the Stumpy enemies. Use the walls to your advantage to trap Naked enemies and block Stumpy projectiles.
• Move to the bottom right, keep distance and use your pistol range to your advantage to aggro Nakeds one at a time.
• Continue right, pickup the rifle weapon.
• Exit through the elevator.

Level 4

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• Exit through the elevator

Level 5 (BOSS)

• Move to the right, down the hallway
• Once the Boss spawns, start shooting him with your pistol

• The pistol deals additional stun damage, and will cause him to enter a stun state. Once he is stunned, swap to the rifle and deal damage as quick as possible.
• Try to avoid area of the the walls in INSANITY mode, they can cause you to get trapped.
• Try to clear enemies as best you can to avoid them overwhelming you.

• He will begin to control your level of insanity regardless of health, be extra aware of avoiding the INSANITY area wall tiles.
• While in "ghost mode" the Nightmare will almost instant kill you, keep your distance.
• Kill the boss!