Level 6: Alpha Quadrant

Open the door in front of you and proceed through the opening to the right.

Kill the Cacodemon and head down the stairs. Go left and get on the lift, riding it to the top.

Head left and follow the hallway to a switch, eliminating any Zombiemen or Shotgun Guys. Hit the switch and turn around.

Follow the left hand wall to an opening, killing any Zombiemen or Shotgun Guys. Go through the opening.

Walk up the stairs to reach a platform. Kill the Hell Knight(s) that appear.

Once the enemies are dead, pathways will rise, and a Yellow Key and a Backpack will appear. Collect both.

Backtrack to the level's starting room and go through the opening in the west part of the room, killing any Lost Souls.

Kill the Cacodemons and head down the stairs. Go to the Chaingun, grab it, and the floor will raise like a lift.

Follow the hall to a switch, killing any Imps, Hell Knights, or Barons of Hell. Hit the switch.

Cross the pathway that rises, but wait for it to drop back down due to a lowered ceiling.

Go through the opening in the west part of this room again. A new opening will appear to your right.

Enter the new opening and hit the switch. Leave this room, head down the stairs to your right, and get back on the lift.

Ride the lift back up and hit the switch again. Cross the pathway to the other end of the room, as the ceiling obstruction is now cleared.

Go through the opening at the other end of the room. Wait for the pathway to drop.

Hit the switch in this small room, and the pathway will rise again. Follow it to another opening and go through.

Wait for the pathway to drop again, then hit the switch. The pathway will raise; cross it to the opening at the other end.

Go through the opening. Reach the platform in the north part of the room. Kill the Baron of Hell on it.

Step on the floor in the middle of the room; it will rise like a lift. Once risen, face the platform the Baron of Hell was on. Run off your current pillar to reach that platform. Hit the switch.

Return to the floor in the middle of the room; it will rise again. Once risen, face the platforms in the east part of the room. Run off your pillar to reach it.

Use your Rocket Launcher to fire at the Pain Elemental (and possibly a Baron or Hell Knight) in front of you.

Once enemies are dead, run across the platforms to the other end of the room. Hit the switch.

Turn around and get on the middle of the three platforms. Turn left and run to the platform with an opening.

Go through the opening. Walk forward, and teleporters will lower to your right and left. Go through either teleporter.

Upon teleporting, turn around and leave this room. Step on the floor in the middle of the room; it will rise like a lift.

Once risen, face the platforms in the west or south part of the room. Run to reach either platform.

Follow the hall to an opening, killing any Spectres. Go through the opening.

Collect the Blue Key. Backtrack to the level's starting point.

Open the Blue Door in the north part of the starting room and go through.

Kill the Hell Knights in front of you and proceed through.

Lower the lift in front of you, get on it, and ride it to the top.

Go left and hit the exit switch.