Maps of chaos secrets
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Proceed through another short room and through the blue door (G). Clear the area of enemies, then head through the yellow door in the southwest corner (F). Once back outside, enter the round central room via the passage in the wall at about the midpoint of the outdoor area (E).Ĭontinue through the door to the south into another dark room.
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If the wall containing the blue key closes, you can open it manually. Climb the stairs and the wall in front of you will open, revealing a blue keycard (D). Go through either of the tunnels at the north end of this room and you'll reach a stairway leading into a brightly lit alcove in the wall. The next room is very large and dark, and is home to several Imps, Revenants, and Arachnotrons. Make your way to the opposite end of the long outdoor area and open the door there. One of the alcoves in the southeastern end of this room contains a yellow key (C). The next room is dark and contains several silver alcoves and holds dozens of zombies (B) (utilizing monster infighting and weapons with splash damage will help you survive this room). Continue through this room and out the opening leading outside. You can lower the vine-covered column here to reveal a chaingun and stimpacks as well as a few Spectres. Continue down the stairs and relatively straight through the opening in the stone wall. Right at the start of the level, open the blue-triangled wall ahead and to the right (A).