You begin in a room surrounded by sludge on top of some shells. In front of you is a long hallway, with a door to the left and right. Go through either door, up the stairs, and clean out the sergeants at the top. Go to the room with the wall that has a demon face on it. The face is a switch. Hit it, grab the goods, and get out and go through the long hallway into a courtyard.
To the right of you is a hallway and another room leading off the courtyard. Go to the hallway, and at the end a door will open behind you, revealing some commandos and a medikit. Go through the door, clear out the commandos, and find the box that looks slightly different from the others. This box is a lift. Ride it up, grab the super shotgun, and kill the arch-vile that appears. Exit the room, go back through the hallway, and head right into the room leading off the courtyard. Follow it to the end, where you will see a pillar with a switch. Hit the switch, grab the medikit, and run back out, killing the revenants that follow. Go back in and grab the rocket launcher and rockets that was in the rooms the revenants came out of, and go back to the courtyard. Go forward and up some stairs, keeping an eye out for baddies, and go through the door. you will be on a walkway that leads off to three different paths. Go forward, and kill the revenant that comes up. Go left, hit the switch in the room, and head back out. Go along the path the revenant came up on, and in the room is a commando on your left and right, and a mancubus that will ride up a lift. Kill them, grab the red skull key, head out, and kill the new baddies that should have just showed up. The hallway they came out of is a lift, and you can ride it up for some shells. Go back into the courtyard, and kill the arch-vile on top of the pillar. Go into the last hallway you haven't been to, and you will be in a room with a pillar in the middle, and imps to the left and right on raised platforms. Proceed forward, and some commandos will appear behind you. Kill them, then go through the red door. Hit the switch, which lowers the pillar with the blue skull key on it. The switch also revealed two commandos, so use your fist to get them to come out. Mash them and grab the key, then exit. Go back up the stairs, and into the hallway that should be in front of you. Kill the commandos and mancubi you see, then go through the blue door. Follow the hallway, and come out onto the platform with the Mancubi, then step on the exit pad.
At the east end of the map is a plus-shaped bridge crossing a pit of brown sludge. Walking along the eastern arm of this bridge causes a wall to open in an alcove in the southwest corner of this room. Drop into the sludge beneath the alcove and lower it like a lift to access the box of shells.
At the starting point of the level, take either side doors and ascend to the rooms on the upper floor. The west wall of the western room contains a gargoyle switch. Hit it to access a small cross-shaped cache containing a backpack (the first one of the entire episode), a megaarmor and a box of shotgun shells.
In the room full of crates to the south east of the starting area is an Arch-vile on a lift, which is lowered by two linedefs in the room. It is possible to become stuck on the platform if you get on it after the Arch-vile leaves, but before it raises, as there is no way to lower it from inside.
There are no items in the map, making it show 0% items were found, some ports ignore this completely.