Doom (1993): All Secret Levels and How to Find Every Secret Exit

When you finish a secret level, the game sends you back to the map after the one you left from, so E1M9 leads on to E1M4. If you skip the secret exits, you simply never see these four maps.

E1M3 Toxin Refinery: secret exit to E1M9

1. From the start, go through the first door, turn left and follow the route to the next door. Go through and bear right.
2. After the short staircase, turn left, go down another staircase and turn left again. A switch here opens a passage near where you came into the room.
3. Take that passage into the computer room. Crossing a line halfway up lowers two hidden ledges.
4. Run up and around the computers to the right to reach the back ledge before it rises. A large door opens onto a pillared room with a nukage river and a rocket launcher.
5. Follow the river into the east tunnel to a small brown room with a switch and a backpack. Press the switch.
6. Go back to the big room north of the start. A bridge now crosses the nukage pit. Cross it, and the grey wall opens onto a long tan passage. Keep walking while three traps open, go through the large doors at the back and press the exit switch at the end of the grey passage.

E2M5 Command Center: secret exit to E2M9

1. Go through the first door, make a hairpin turn and climb the corner staircase to the wide hallway.
2. Take the skull switch door at the west end of the hallway and follow the concrete passage to the H-shaped green marble room.
3. Bear right and open the nearby skull switch door. Press the skull switch inside. A stairway rises in front of the fireplace in the north-west corner.
4. Walk through the fire into the hidden teleporter behind it. You arrive in a round metal room.
5. Open the lion-faced wall behind you. A second hidden teleporter takes you to the final hallway and the secret exit room.

E3M6 Mt. Erebus: secret exit to E3M9

The secret exit is inside a small blue building standing in the water. The route given by the Doom Wiki uses a rocket jump:

1. Pick up an invulnerability sphere, then go back through the teleporter from the map’s second secret.
2. On the platform where you arrive, move right and round the corner. The blue building is in the water below.
3. Stand directly across from it, facing the red brick wall.
4. Fire the rocket launcher at the wall while running backwards. The blast throws you into the building, and invulnerability absorbs the damage.

E4M2 Perfect Hatred: secret exit to E4M9

1. Get both keys: the yellow skull key from the west walkway and the blue one from the east chamber.
2. In the large central room, raise the blue-keyed column blocking the tall stairway at the north end and climb to the top.
3. Face south and step backwards onto the floor trigger behind you. A central column rises and reveals a teleport pad.
4. Go back down and take the new teleporter. You arrive in a small alcove behind a low barrier.
5. Use the barrier like a switch. It lowers and briefly opens a doorway down in the lava, in the south-east corner of the main room.
6. Step past the barrier, turn right and run through the lava to that doorway before it closes. If you miss it, go round the room, back up the stairs and use the teleporter again.

How to spot secrets in any Doom map

• Walls with a slightly different texture, or one that does not line up with its neighbours, often open when you press Use on them.
• The end-of-level screen shows your Secret percentage, so you know when a map still hides something.
• Typing the cheat IDDT on the automap shows the whole map. Type it again to show items and monsters too.
• Many secrets open for a short time only. If a wall closes again, look for the trigger you crossed and try once more, running.

Sources

• Doom Wiki (Fandom): Secret level
• The Doom Wiki: E1M3 Toxin Refinery
• The Doom Wiki: E2M5 Command Center
• The Doom Wiki: E3M6 Mt. Erebus
• The Doom Wiki: E4M2 Perfect Hatred
• ClassicDoom: E4M2 secret exit
• ClassicDoom: Secret exits in classic Doom games

Last checked against sources: 8 November 2026.