MAP14: City in the Clouds (Hell Revealed)

MAP14: City in the Clouds, designed by Yonatan Donner, is the fourteenth map of Hell Revealed. It uses the music track "Excalibur" from Rise of the Triad.

Description
According to the Hell Revealed info pack:


 * A very tough city level. This level is special in several ways. First of all, I dreamt it. Yes, some parts of this level appeared in my dream and I built them accordingly - only that in my dream, I think I had godmode on :-) The city is floating - you can watch behind the fence, and you'll see the sky. In this area, disconnected from the rest of the world, you will have to pass several guardians to leave, and don't expect an easy fight! My dreams are not friendly! :-)


 * Size: large
 * Difficulty: very hard

Secrets

 * 1) In the building with the blue door go to the large room in the north with the Cyberdemon. A part of the northern wall is a door to a secret compartment with a Bulk cell and a switch.
 * 2) After the switch in secret #1 is pressed the south-west pillar of the 3x3-pillar-array in the southeast of the level lowers revealing a teleporter. This teleports you on to the Arachnotron-walls surrounding the central Cyberdemon-area. Which of the walls you are teleported to depends on which side of the teleporter you step in. Step into the teleporter from the east, teleporting to the south-west wall. From there run across the air to the ledge surrounding the blue-keycard-building. There you find a Green armor and on the opposite side a Computer map.
 * 3) While on the ledge from secret #2 open one section of the northern wall of the building, revealing a Megasphere.
 * 4) Step into the teleporter from the west end, and you will be warped to the northwest Arachnotron wall.  Look west to see a light-grey building with stairs; in the center of it is a pillar with a BFG 9000.  Stand on the northeast side of the wall, turn your side so it faces the northeast corner of the light-grey building, and perform a strafe50 jump onto the sides. When you do so, immediately halt your movement.  Both of these may take many tries until you can pull them off, particularly since the north side of the building is marked as impassible, and must be avoided.  When this is done successfully, walk to the east side of the building, and turn the side of your body toward the pillar, standing near the east edge.  From there, perform another strafe50 jump onto the pillar.  If successful, this secret will be triggered and the BFG can be obtained.
 * 5) After grabbing the red key from the H-shaped building in the north you can run over the pillar on the north that contains a Plasma gun.

Speedrunning
See:
 * Hell Revealed at Compet-N
 * Hell Revealed at the Doom Speed Demos Archive