MAP23: Ancalagon (Realm of Chaos)


Realm of Chaos maps 21-30

01 02 03 04 05 06 07 08 09 10 11
12 13 14 15 16 17 18 19 20
(21 - 30)
Secret maps: 31 32

This level occupies the map slot MAP23. For other maps which occupy this slot, see Category:MAP23.
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MAP23: Ancalagon is the twenty-third map of Realm of Chaos. It was designed by Steve Duff.


Map of Ancalagon
Letters in italics refer to marked spots on the map. Sector, thing, and linedef numbers in boldface are secrets which count toward the end-of-level tally.


Other points of interest[edit]


  1. In the red key area, drop into the blood at the west end and enter the corridor nearby. Open the door and enter the room, then leave and head up the steps to the newly-opened area to the west. In this small room, a section of the west wall is slightly misaligned. Press on it and go down the steps, opening the marble faceted wall to find a secret area with a megaarmor and a soul sphere. This area contains eight secrets. (sector 91)
  2. See Secret #1. (sector 213)
  3. See Secret #1. (sector 214)
  4. See Secret #1. (sector 215)
  5. See Secret #1. (sector 216)
  6. See Secret #1. (sector 217)
  7. See Secret #1. (sector 218)
  8. See Secret #1. (sector 219)
  9. Press the switch in front of the yellow door and head east, then north through the new opening. Approaching the door opens it, but also opens a wall behind you containing three imps, three rockets, a medikit, and a box of shotgun shells. (sector 122)
  10. In the area with four lifts, take either of the furthest ones down. If you took the closer of the two, go along the hall until you reach a shotgun, then turn north and press on the wall (if you took the further of the two, it is a bit north from the shotgun on the east wall. This secret area counts as three secrets, both the entrances and the room itself, and contains two Hell knights, a chaingun, a medikit, and ammo. (sector 167)
  11. See Secret #10. (sector 288)
  12. See Secret #10. (sector 276)
  13. In the area with four lifts, take the furthest one down. When you reach the third burning barrel, press on the wall to the right of it and take the next lift up. Open the wall with the face on it to head outside. The hole around the BFG9000 will rise revealing revenants, and you can use the block to get the BFG9000. The corridors leading to this area count as four separate secrets. (sector 281)
  14. See Secret #13. (sector 285)
  15. See Secret #13. (sector 286)
  16. See Secret #13. (sector 275)
  17. In the area with four lifts, take either of the nearest ones down. In either case, when you reach the faceted wall, you should spot a section of wall that is misaligned nearby. Open it to find two shotgun guys guarding a cache of rockets. The entrances of this corridor and the corridor itself count as three separate secrets. (sector 290)
  18. See Secret #17. (sector 291)
  19. See Secret #17. (sector 293)


Demo files[edit]

Areas / screenshots[edit]


Routes and tricks[edit]

Current records[edit]

The records for the map at the Doom Speed Demo Archive are:

Run Time Player Date File Notes
UV speed 2:19.43 Andrey Boldt (Hitherto) 2022-07-12
NM speed
UV max 13:18.40 Nikolay Kamnev (Heretic) 2007-03-08
NM 100S
UV -fast
UV -respawn
UV Tyson
UV pacifist

The data was last verified in its entirety on August 1, 2022.


Player spawns[edit]

This level contains eleven spawn points:

  1. facing north. (thing 523)
  2. facing north. (thing 524)
  3. facing north. (thing 525)
  4. facing north. (thing 526)
  5. facing north. (thing 527)
  6. facing north. (thing 528)
  7. facing north. (thing 529)
  8. facing north. (thing 530)
  9. facing north. (thing 531)
  10. facing north. (thing 532)
  11. facing north. (thing 533)


Map data[edit]

Things 536
Vertices 1826*
Linedefs 1973
Sidedefs 2776
Sectors 342
* The vertex count without the effect of node building is 1579.


This level contains the following numbers of things per skill level:

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]