MAP18: Optional Bases Opposed (BTSX-E2)

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).

Official

 * 1) At the north-eastearn part of the map is an elevated section of the level, containing secret #2 among others. Immediately behind the stairs going up to that section is a lid. Press on that lid to open a small compartment containing a berserk pack. (sector 96)
 * 2) At the north-eastearn part of the map is an elevated section of the level, where a soul sphere is visible on a pedestal with a computer panel nearby. Press on the computer panel to lower the pedestal, allowing grabbing the soulsphere. (sector 140)
 * 3) On the easternmost part of the map, shortly before finishing the path that ultimately leads to the red key, there is a desert-like area surrounded by blue torches where you are ambushed by teleporting monsters. You can use three small pilars on that area to climb to a small section containing a tiny hole. Falling down that hole leads to a small underground secret area (sector 509) containing a soulsphere among others.
 * 4) In the central part of the map, near a pool of slime with two dead players and the chainsaw, there is a ring-shaped structure where a soulsphere is visible through a small window. Press on the nearby green torch to lower a wall allowing access to the soulsphere. (sector 562)
 * 5) On the north-central part of the map, a button can be pressed to lower a rocket launcher, and which also lowers some walls containing monsters. On one of the monster closets that opens next the rocket launcher, there is a hidden switch with the image of a crucifix. Shoot that switch to reveal a teleporter on another of the monster closets nearby, allowing you to telefrag some of the monsters in the beginning area and access a secret area (sector 787) containing a soul sphere guarded by two arch-viles.

Non-official
On the western part of the map, at the start of the route leading to the blue key, there is a section with a zig-zag shaped path which ultimately lowers to reveal two arch-viles and a button unlocking a plasma gun and allowing to proceed further down the path. That same button also opens the bars to another section to the west which requires either the red of the yellow key and contains a BFG9000.

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

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

Player spawns
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)

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