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Level 3: Main Engineering
Doom 64

Level 3: Main Engineering

Navigate Doom 64's Main Engineering level with our comprehensive walkthrough. Find the Super Shotgun, Blue Key, Yellow Key, Red Key, and exit switch.

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Navigate Doom 64's Main Engineering level with our comprehensive walkthrough. Find the Super Shotgun, Blue Key, Yellow Key, Red Key, and exit switch.

Walkthrough
  1. 1
    At the start, pick up the Super Shotgun to your left and eliminate the nearby Shotgun Guy.
  2. 2
    Proceed straight ahead and activate the switch in front of you. This lowers walls, revealing Nightmare Imps.
  3. 3
    Enter the left opening and follow the hall to a door on your right. Eliminate any Nightmare Imps encountered.
  4. 4
    Open the door and enter the room.
  5. 5
    Walk towards the wall ahead and wait for 7-8 seconds for Nightmare Imps to appear. Defeat them.
  6. 6
    Proceed through either of the newly opened passages.
  7. 7
    Head up the stairs, eliminating any Imps in your path.
  8. 8
    At the top of the stairs, go through the opening to collect the Blue Key.
  9. 9
    Return to the floor below.
  10. 10
    Leave this room and re-enter the area where you found the Blue Key.
  11. 11
    Go through the Blue Door to your right.
  12. 12
    Enter the opening ahead and eliminate all Cacodemons.
  13. 13
    Once all Cacodemons are defeated, new doors will appear in the central building. Open either door and activate the switch.
  14. 14
    Use the new teleporter to your right or left.
  15. 15
    Upon teleporting, you will be on an upside-down U-shaped platform. Move to the center and activate the switch on the pedestal.
  16. 16
    A new opening will appear in the building ahead, revealing Lost Souls. Defeat them (and Cacodemons on hard skill levels).
  17. 17
    From the middle of the platform, use the small step to drop to the floor below.
  18. 18
    Navigate to the south part of the building and find a new lift. Activate it and ride it to the top.
  19. 19
    At the top, collect the Yellow Key.
  20. 20
    Return to the lift and ride it back down.
  21. 21
    Head straight and exit this room.
  22. 22
    Enter the door to your left.
  23. 23
    Follow the left wall to an opening and proceed through it.
  24. 24
    Ascend the stairs, eliminating any Imps.
  25. 25
    At the top, go straight to find and pick up the Rocket Launcher.
  26. 26
    Head left towards the Yellow Door and pick up the Chaingun located in front of it.
  27. 27
    Open and go through the Yellow Door.
  28. 28
    Activate the switch in front of you.
  29. 29
    Wait for a few seconds as Lost Souls and Imps appear. Defeat them all.
  30. 30
    Once they are dead, the bars blocking access will lower. Enter the room.
  31. 31
    Drop into the gap in the middle of the room.
  32. 32
    Locate and activate both switches. Note that one switch remains on, while the other turns on and then off.
  33. 33
    Find the switch that stays on and leave the room.
  34. 34
    Back outside, collect the Red Key.
  35. 35
    Turn around and go back through the Yellow Door.
  36. 36
    Follow the right-hand wall to the Red Door.
  37. 37
    Open and go through the Red Door.
  38. 38
    Follow the hall to the exit switch, eliminating any Imps.
  39. 39
    Activate the exit switch to complete the level.
Tips
  • Be sure to pick up the Super Shotgun early in the level for an advantage.
  • Listen for audio cues indicating enemy spawns, especially Nightmare Imps and Lost Souls.
  • On harder difficulties, be prepared for additional Cacodemons to appear after defeating the Lost Souls on the U-shaped platform.
  • Remember the location of the switch that stays on in the room with two switches, as it's crucial for progression.

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