MAP19: Bingo Pool Hall of Blood (BTSX-E1)

MAP19: Bingo Pool Hall of Blood is the 19th map of Back to Saturn X episode 1. It was designed by Richard Frei and Sarah Mancuso, using the track "Faultline" by James Paddock.

Official

 * 1) Sector 207: In the tower accessed with the yellow key, to the right of the arch-vile trap leading to the red key, there is a large open space that faces a building with two columns of windows on either side of a large concrete section. From this point, turn left. An inconspicuous yellow switch is on the left side of the small cubby seen from this position. When approached, a wall near the switch will open, revealing two chaingunners. When the switch is pressed, the large concrete section on the other building will lower to the ground, revealing the hellish landscape hidden within the building. Ride the concrete section back up to find a megasphere. Approaching the megasphere triggers the secret, and spawns several monsters behind you.
 * 2) Sector 397: In the large building in the center of the map, there is a very large elevator that lowers to reveal a mancubus and the yellow key. Ride this elevator back up, then turn away from the large building and look for a window to a flashing room. Inside this room is a switch. Shoot the switch. The switch opens a wall in the blood-falls area, near one of the green torches. Inside it are 3 bunches of 4 shotgun shells, 2 energy cells, and an invulnerability sphere.

Non-official

 * 1) Near the first elevator accessed with the yellow key is a second elevator leading up to an invulnerability sphere. At the back of this location is an open vent shaft that leads down to a teleporter. On the other side of this teleporter is a building with two mancubi and a BFG9000.

Speedrunning
The records for this map on the Doomed Speed Demos Archive are: