Level 18 Secrets

When you walk around the pillar in the center of the main area, a
number of doors will open up, including two against the wall west of
the center pillar. Of these two doors, the north one leads to a
BFG9000 and some more monsters (#1). (The south one has a hall of
mirrors effect in the door tracks.)

When you walk counterclockwise around the pillar in the center of
the main area, a door will open up northeast of the pillar leading
to a teleporter, which takes you to the platform southwest of the
pillar. The platform (#2) contains some rockets, health, and blue
armor. The teleporter will not be there until you hit the switch
on the northeast corner of the plus-shaped structure just to the
south of it (the one containing the cacodemons).

In the northwest corner of the map, hidden between the structures on
the north and west walls, is a corner with a small bit of grass.
Walking into the grass teleports you to the northeast corner of the
map, on a ledge containing a medical kit and a computer map. (Note
that the building just to the east of the bit of grass has an
unclosed sector inside it in version 1.666; you can see out the east
wall.)
In the east area of the map is a hallway ending at a blue wall with
a skull switch. Hitting the switch opens a hidden door revealing a
chaingun (#4).
If you're having trouble getting out of the starting room, shoot a pistol
or shotgun at the door with the lion on it.
Coordinates
1 17 <f7f40000, 3f60000> (-2060, 1014)
2 36 <fa050000,ff050000> (-1531, -251)
3 76 < a300000, 4300000> ( 2608, 1072)
4 74 < 8b00000, 940000> ( 2224, 148)
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