Monorail Skybridge: Complete Walkthrough of Level 12 of Doom 3

As you exit the airlock the bridge in front of you will collapse. Make your way over the wreckage quickly and watch out for the two cacodemons who are floating around. You’ll find some extra air canisters and a medkit to grab then turn right and run round the rocks.

Move to the left and hit the control panel to enter the next airlock. In the next corridor the lights will dim and a pinky will charge you so be prepared. As you turn right at the end of the corridor there will be a zombie and a maggot; you’ll also find some pick ups in the alcove on your right. When you reach the door there will be a zombie on your left and an imp behind you.

Use the medical station if you need to and go through the door to trigger a short cut scene.

It’s your first revenant; take him out as quick as you can.

Head up the ramp and kill the imp in the darkened room to your right, grab the pick ups off the shelves. You’ll find another revenant on the walkway on the left side of the room; head over there and go through the next door. There will be a pinky waiting for you, then an imp on the right and a zombie behind you.

Take the door on the right and you’ll trigger a creepy scream. Take out the imp that spawns in front of you and use the barrel to blow away the wraith and imp to your right, then call the lift. If you check to the right in the dark recess you’ll find some armor.

When you reach the bottom take out the two maggots in the corridor and grab the pick ups on your left; there’s another maggot at the next corner.

Grab the medkit on your right and as you go through the next doorway there will be two revenants, one in front and one off to the left. You can use the explosive barrels to take out the one on the left and then head up there and an imp will spawn in.

There are some pick ups on the left as you head down the corridor and another three imps will spawn in. Go through the door on your left and kill the two pinky’s, but watch out for a third spawning in behind you.

As you head through the doorway and down the next corridor you’ll find a zombie lumbering out of the darkness on your left and a wraith behind you. As you turn right into the next room there are two zombies on your right and an imp straight ahead.

Grab the pick ups on the shelving and kill a maggot and two more zombies before heading up the stairs. At the top there is an imp on your left and a revenant hidden in an alcove to your right. As you come round the walkway towards the door there is a pipe on your left which you can jump onto for armor and ammo, but watch out for two imps spawning in behind you.

Get back on the walkway and go through the door.