Doom Episode 1 Secrets: Knee-Deep In The Dead (1993)

E1, M3: Toxin Refinery

This map has several secret places, including one that leads to a separate exit to get to a secret level!

Secret 1

doom secrets floor 3 switch

Press the switch in this picture to open up a secret stairway to the yellow key room.

Doom level 3 secrets stairway

You can find a hidden elevator platform by running up the stairway and sprinting to the left. Here you will find a soulsphere.

doom episode 1 secrets map 3 platform 1

Secret 2

The same as secret 1, but on the right side of the yellow key room instead of the left.

doom episode 1 secrets level 3 platform 2

Secrets 3 and 4

Inside secret 2, there is a tunnel in the slime that leads to a switch. The switch raises a platform in the slime pit at the starting area of this level.

doom secrets discolored wall

Next to the switch in secret 3 is a section of wall that looks a bit different. This is a secret door that opens to reveal a chain gun.

Secret 5

doom level 3 secrets wall opens

In the room past the blue key door is a slightly inset wall. This is a secret door that leads to a bunch of goodies.

Secret 6

doom secret level entrance

In the starting room, there is a pathway over the slime, which appears when you toggle the switch in secret 3. This leads to the secret level exit.

Secret 7

doom episode 1 secrets floor 3 final

The wall opposite the secret exit switch is a final Map 3 secret that leads to a box of rockets.

Here’s a video walkthrough of Doom Episode 1, Map 3. I initially went to the right instead of the left in the video, so you see secrets 2, 3, and 4 of this post before secret 1.

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