E2M9: Fortress of Mystery
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Fortress of Mystery Walkthrough
The Fortress of Mystery is the secret level for the second episode. You begin in the center of a snowflake-shaped room surrounded by Barons of Hell. Quickly open the door to the east to release the 10 Cacodemons. Run around behind them to encourage the Barons and Cacodemons to fight each other.
Before too long the Barons destroy all of the Cacodemons. You can then finish off the Barons. In each of the rooms of the snowflake you’ll find ammo and guns. The center of the east room has a Soul Sphere.
When you’ve finished gathering items open the secret door to the east. This small room has four doors, one neutral door and one for each of the keys. Open the first door to find the first key. Continue until you find the exit.