MAP18: Optional Bases Opposed (BTSX-E2)


Back to Saturn X E2 maps 17-23

01 02 03 04 05
06 07 08 09 10 11
12 13 14 15 16
(17 - 23)
24 25 26
Secret map: 31

This level occupies the map slot MAP18. For other maps which occupy this slot, see Category:MAP18.

MAP18: Optional Bases Opposed is the eighteenth map of the second episode of Back to Saturn X. It was designed by Paul DeBruyne (skillsaw) and uses the music track "Birdsong," composed by Stuart Rynn (stewboy).

Under construction icon-yellow.svgThis article about a map is a stub. Please help the Doom Wiki by adding to it.


Map of Optional Bases Opposed
Letters in italics refer to marked spots on the map. Sector numbers in boldface are secrets which count toward the end-of-level tally.


Other points of interest[edit]


  1. (sector 96)
  2. (sector 140)
  3. (sector 509)
  4. (sector 562)
  5. (sector 787)


Demo files[edit]

Areas / screenshots[edit]


Routes and tricks[edit]

Current records[edit]

The records for the map at the Doomed Speed Demos Archive are:

Run Time Player Date File Notes
UV speed
NM speed
UV max
UV -fast
UV -respawn
UV Tyson
UV pacifist

Miscellaneous demos[edit]

Style Time Player Date File Notes

This information was last verified in its entirety on January 20, 2018.


Player spawns[edit]

This level contains seven spawn points:

  1. facing north-east. (thing 35)
  2. facing north-east. (thing 570)
  3. facing west. (thing 571)
  4. facing south. (thing 572)
  5. facing north. (thing 573)
  6. facing west. (thing 574)
  7. facing east. (thing 575)


Map data[edit]

Things 807
Vertices 5395*
Linedefs 5475
Sidedefs 8060
Sectors 933
* The vertex count without the effect of node building is 4481.


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

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]