MAP21: Failed Experiments and Trashed Aircraft (BTSX-E1)

MAP21: Failed Experiments and Trashed Aircraft is the twenty-first level of the first episode of Back to Saturn X. It was designed by Nick Laurent (Hobomaster) and Richard Frei (Tarnsman), and uses the music track "Heliotrope" by James Paddock.

Walkthrough

 * Letters in italics refer to marked spots on the map. Sector numbers in boldface are secrets which count towards the end-of-level tally.

Secrets

 * 1) Sector 194:
 * 2) Sector 456: Go down the slime corridor west of the blue key room. At the end, go up the lift. Turn around, and shoot the switch on the opposite platform. This raises a walkway to the platform, where a chaingunner can be found.
 * 3) Sector 541
 * 4) Sector 549: In the south-east of the map, find a way into the nukage itself, rather than the bridge. The south-west of this room holds a dark tunnel. A backpack and radiation suit are inside.

Speedrunning
The records for this map at the Doomed Speed Demos Archive are: Last updated on 16 March, 2013.

Things
This level contains the following number of things on each skill level:

Inspiration and development

 * In versions of Back to Saturn X up to 0.99i8, this map held the MAP20 slot. In versions starting from 0.99i8, the addition of a new MAP19 moved some maps forward by one slot.