E1M3: Toxin Refinery (Doom)

E1M3: Toxin Refinery is the third map of Knee-Deep in the Dead in Doom.

Walkthrough
Go through the first door and turn left. Follow the route along to the next door. Go through this door. To your right, go straight on to another door. Go through this door. Follow the route along to a room with a donut-shaped walkway above some slime. Travel to the opposite side of this area and past some computers. Follow the passageway along until you find a blue key. When you pick this key up, the lights in the passageway will turn off.

Go back to the room next to the entrance surrounding some slime. There is a blue door here, go through it. Go through one of the doorways on the opposite side of the room. You should now find yourself in a large room with pillars. Go into the central section and some stairs will begin to rise up. Go up the stairs and into the exit room. Press the switch.

Secrets

 * 1) Just past the room containing a window where a soul sphere is visible, there are some steps leading down.  In the lower level there is a switch.  Pressing this causes a passageway to open (next to the window with the soul sphere). Travelling up this passageway leads to a room with computers.  Walking along this passageway causes two secret platforms to lower.  To reach a platform, the player must run up the passageway stairs and reach the platform before it raises again. The first platform is in the west corner of the room.  Stepping onto the platform causes a door to open revealing a passage which leads to the dark room with the soul sphere.  The column holding the sphere can be lowered with a switch on the side.
 * 2) The second platform is near the north corner of the room.  Stepping onto the platform causes a passageway to open.  This leads to a room with pillars and a slime "river".  There is also a rocket launcher here.
 * 3) Following the slime "river" through a tunnel leads to another room with a switch. Pressing the switch causes a bridge to rise up across the slime in the start area.
 * 4) There is a secret door in the switch room. This leads to a room with a chaingun.
 * 5) Just past the steps leading from the room where the soul sphere can be seen, there is a secret window which can be opened on the east wall.  This gives a view of the room which leads to the secret exit.
 * 6) In the secret room with the computers, there is a yellow key.  In the room immediately past the blue key door, there is a secret door on the far east side. Opening this door reveals a room with some steps. Following the steps up leads to the yellow key door.  This allows access to a tower with various powerups.
 * 7) Travelling across the bridge over the slime in the start area (which was raised by the switch above) leads to a secret exit which takes the player to E1M9: Military Base. In the room with the secret exit, the north wall is an elevator. This leads to a passage overlooking the outdoor area with the donut-shaped walkway. There is an imp and a box of rockets here.

Demo files

 * [[Media:e1m3secr.lmp|No monsters, 100% secrets walkthrough]] (file info)

Records
The Compet-N records for the map are: