MAP20: The Last Stand (Perdition's Gate)

MAP20: The Last Stand is the twentieth map of Perdition's Gate.

Essentials
At the start, open the gate in front then go down the stairs. Go around the pillar then step on either platform to the sides of the waterfall to lower the yellow key behind you. Collect the key then turn left and open the yellow door. As you approach the wall in front of you it will lower, revealing the blue key. Grab it, then exit the room and go forward to open the blue door. Inside, flip the switch ahead and exit the room. Turn left, climb up the stairs ahead and enter the teleporter in front to end the level.

Secrets

 * 1) After opening the gate at the start, you'll spot a teleporter on each side before the stairs. Enter the teleporter to the left to be teleported to the other one. Without stepping out of the teleporter, open the wall to the west to find a megasphere. (sector 31)

Current records
The records for the map at the Doom Speed Demo Archive are:

The data was last verified in its entirety on January 16, 2022.

Player spawns
This level contains four spawn points:
 * 1) facing south-east. (thing 7)
 * 2) facing north-west. (thing 59)
 * 3) facing north-east. (thing 82)
 * 4) facing south-west. (thing 95)

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