SECRETS

E3M1:

1. When you enter the North-West area you'll see an area to your left with a Soul Sphere. As you enter the circular corridor a door there will open briefly. Run leftward into the secret area.

E3M9: 

1. When you enter the North-West area you'll see an area to your left with a chainsaw. Enter the circular corridor and turn right, following the corridor to the stairs. When you reach the bottom of the stairs you'll hear a wall open at the top of the stairs. Go back up the stairs into the newly-opened area and press the lion's head switch to your right. Now retrace your steps around the circular corridor to the newly-open secret area with the chainsaw.

2. Enter the yellow-key doorway and take the corridor around to the stairs at the end. Go up the stairs to the circular area with the 4 alcoves. Entering the alcove to your South-West (the one with the candle) will briefly open a secret door in the alcove to the South-East. Run there to get inside before the door shuts. Take the teleporter to a chamber that will allow you to whittle down the opposition in the adjacent area. Even without ammo you can encourage monster infighting to thin the herd.