MAP21: The Lost Facility (The Twilight Zone)


The Twilight Zone 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 MAP21. For other maps which occupy this slot, see Category:MAP21.
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MAP21: The Lost Facility is the twenty-first map of The Twilight Zone. It was designed by Paul Corfiatis and uses the music track from E1M7/E4M7 of Heretic, composed by Kevin Schilder. The par time defined in MAPINFO is 3:45.


Map of The Lost Facility
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. Open the wall behind the starting point to get a berserk pack, a megasphere, and a radiation suit. (sector 4)
  2. In the water area at the north end of the map, open the wall in the southwest corner near the entrance to find a chainsaw, a plasma gun, a box of ammo, and a box of shotgun shells. (sector 54)


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
NM speed
UV max
NM 100S
UV -fast
UV -respawn
UV Tyson
UV pacifist

The (absence of) data was last verified in its entirety on January 16, 2022.


Player spawns[edit]

This level contains five spawn points:

  1. facing east. (thing 37)
  2. facing west. (thing 115)
  3. facing south. (thing 144)
  4. facing east. (thing 207)
  5. facing east. (thing 372)


Map data[edit]

Things 390
Vertices 1529*
Linedefs 1149
Sidedefs 1858
Sectors 220
* The vertex count without the effect of node building is 1034.


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

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]