MAP20: Immundus Stagnum (3x3)


3x3 maps 12-20

01 02 03 04 05 06 07 08 09 10 11
(12 - 20)
21 22 23 24 25 26 27
Secret maps: 31 32

This level occupies the map slot MAP20. For other maps which occupy this slot, see Category:MAP20.
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MAP20: Immundus Stagnum is the twentieth map of 3x3. It was designed by Worst-vd-plas and uses the music track "Wolverine" by James Paddock (Jimmy). The par time defined in MAPINFO is 2:30.


Map of Immundus Stagnum
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 outside area on the west side, head north in the first nukage pool and west to a soul sphere. (sector 407)
  2. In the area southeast of the hub, use the northwest wall that is lit to get a light amplification visor (not on Ultra-Violence or higher) and a radiation suit. (sector 450)
  3. In the main hub, go to either of the west paths and use the step to get into the square in the middle for a green armor. (sector 494)
  4. In the blue key area, get on the highest block at the northwest end and lower the west wall for a megaarmor. (sector 497)


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 8:32.66 Luleta 2022-02-24
NM 100S
UV -fast
UV -respawn
UV Tyson
UV pacifist

The data was last verified in its entirety on April 3, 2022.


Player spawns[edit]

This level contains five spawn points:

  1. facing north. (thing 385)
  2. facing north. (thing 386)
  3. facing north. (thing 387)
  4. facing north. (thing 388)
  5. facing north. (thing 389)


Map data[edit]

Things 606
Vertices 3425*
Linedefs 3417
Sidedefs 5727
Sectors 540
* The vertex count without the effect of node building is 2936.


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

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]