BS L21
The starting areaThe starting area
Authors Brian Sparks, Craig Sparks
Port Vanilla Doom
Year 1994
Link Doomworld/idgames
This level occupies the map slot E2M1. For other maps which occupy this slot, see Category:E2M1.
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BS_L21 is a single-level PWAD for Doom that was released in August 1994. It was designed by Brian and Craig Sparks. That same month, the authors would release BS_L22.


Map of BS_L21
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. The path south of the pillar with the switch that opens up the route to the blue key has a lift leading to a room with some items. En route to this room is a secret door to the west (marked with a different texture), leading to an outdoor area with two boxes of bullets, 4 shotgun shells (neither present on easy skill), three armor bonuses, 4-6 shotgun guys, and 0-3 imps. (sector 171)
  2. The door immediately before the door opened by the aforementioned switch (leading to the blue key area) counts as a secret and is impossible to miss. (sector 81)
  3. East of the red door is a path leading to a lift to a health bonus. There is a secret door to the east here leading to an armor. (sector 37)
  4. North of the blue door is an alcove with a box of shotgun shells (hard skill only). The back wall of this is a secret door leading to a chainsaw (hard skill only) and a switch which opens up the windows to the outdoor area. (sector 147)
  5. The nukage surrounding the yellow key counts as a secret and is impossible to miss. (sector 16)
  6. En route to the yellow key area is a path leading to a lift - at the top is a secret area mirroring #3, leading to a medikit. (sector 41)


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 November 30, 2021.


Player spawns[edit]

This level contains four spawn points:

  1. facing north. (thing 4)
  2. facing north. (thing 9)
  3. facing east. (thing 10)
  4. facing north. (thing 14)


Map data[edit]

Things 316
Vertices 597*
Linedefs 695
Sidedefs 973
Sectors 181
* The vertex count without the effect of node building is 517.


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

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]