MAP28: Unknown (STRAIN)


STRAIN 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 MAP28. For other maps which occupy this slot, see Category:MAP28.
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MAP28: Unknown is the twenty-eighth map of STRAIN. It was designed by Björn Hermans and uses a music track by Jon Landis.


Map of Unknown
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. Shoot the wall east of where the red key is and head a bit north for a long corridor with a green armor, NFG, mini-battery, and shotgun shells that eventually leads up to a soul sphere and the yellow key. This area counts as eleven secrets. (sector 80)
  2. See Secret #1. (sector 237)
  3. See Secret #1. (sector 225)
  4. See Secret #1. (sector 226)
  5. See Secret #1. (sector 227)
  6. See Secret #1. (sector 228)
  7. See Secret #1. (sector 229)
  8. See Secret #1. (sector 231)
  9. See Secret #1. (sector 233)
  10. See Secret #1. (sector 234)
  11. See Secret #1. (sector 236)
  12. Enter the center of the area of the west side of the map to reveal the middle pillar, then use its west side. Now head west, and use the switch on the northwest column, which reveals a switch to the north. Go towards that switch, then go towards the bloodfall on the west wall. You can go through it to get a backpack, a battery, a berserk pack, and partial invisibility. This particular area actually moves up and down. (sector 317)
  13. At the northern area, make your way to the northwest side, where a wall opens up ahead of you. Shoot the switch you see to the northeast, then backtrack and enter the dark hall to find a green armor. (sector 168)


A multiplayer-only super shotgun (Thing 369) and ditto chaingun (370) have no flags set for any of the three difficulty classes, so they do not actually appear in the level.

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 6:52.83 Nikolay Kamnev (Heretic) 2008-06-11
NM 100S
UV -fast
UV -respawn
UV Tyson
UV pacifist

The data was last verified in its entirety on June 2, 2022.


Player spawns[edit]

This level contains six spawn points:

  1. facing north. (thing 80)
  2. facing north-west. (thing 81)
  3. facing south-east. (thing 82)
  4. facing south. (thing 83)
  5. facing south. (thing 84)
  6. facing west. (thing 85)


Map data[edit]

Things 398
Vertices 1550*
Linedefs 1596
Sidedefs 2414
Sectors 346
* The vertex count without the effect of node building is 1196.


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

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]