MAP25: Main Laboratory (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 MAP25. For other maps which occupy this slot, see Category:MAP25.
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MAP25: Main Laboratory is the twenty-fifth map of STRAIN. It was designed by Arthur Chang and uses the music track "Beneath" by Mark Klem.


Map of Main Laboratory
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 area past the steps past the blue door, open the wall with the blood pool in front of it to get a soul sphere. (sector 679)
  2. Take the curved staircase at the southwest end to a room with a computer at the north end. Use the wall with red lights to get a berserk pack. (sector 397)
  3. In the jagged caves at the west end of the map, enter the center of the lava to get a megasphere. (sector 403)
  4. In the cargo room at the north end of the map, climb the crates at the southeast up to a megaarmor. (sector 481)
  5. From the previous secret, drop west to a health bonus to lower a crate with a computer area map. The crate with the health bonus counts as the secret. (sector 486)
  6. In the blue-floored hall, take the lift up to the ledge with several switches. The switch northwest of the lift opens up an NFG and mini-batteries. (sector 515)
  7. Take the long corridor at the north end of the map east and south, all the way back to the teleporter to the yellow key room. One of the curved steps is the secret. (sector 121)


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 9:49.03 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 seven spawn points:

  1. facing north. (thing 404)
  2. facing north. (thing 405)
  3. facing west. (thing 406)
  4. facing north. (thing 407)
  5. facing north. (thing 408)
  6. facing north. (thing 409)
  7. facing north. (thing 410)


Map data[edit]

Things 575
Vertices 3730*
Linedefs 3595
Sidedefs 5569
Sectors 698
* The vertex count without the effect of node building is 3023.


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

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]