MAP21: Twilight Lab (Memento Mori)

MAP21: Twilight Lab is the twenty-first level of Memento Mori. It was designed by Andy Badorek and uses the music track "Mummy Rags" by Mark Klem. This level was first created by Badorek in 1995 as a standalone level, TWILAB.WAD; the Memento Mori version features several modifications for cooperative multiplayer gameplay.

Secrets

 * 1) Upon going down the elevator from the start area, head near the red key door. In the corner opposite of this door is a section of wall covered with a spray-painted X.  Open this wall to reveal a hidden room, and then walk across the north of the rock pit to reveal a secret compartment containing three Lost Souls, a plasma rifle, a bulk cell, and some cells.
 * 2) In the computer room with the walkway along the edges, drop into the pit and press on the outer sides of the walkway to lower it like an elevator. This will reveal two holes in the northeast corner of the room.  Enter either one of these to find a secret alcove with Lost Souls, sergeants, chaingunners, and a berserk pack.
 * 3) Upon entering Toxic Experiment (through the red key door,) enter the eastern hallway, run up either the stairway, and flip the switch to lower the platforms in the north, revealing a hidden alcove with three rockets and a stimpack.
 * 4) In the Containment Area (crate storage) is a computer console upon which several health and armor bonuses rest. Head over to the southeast of the room and walk over the two small crates from the west; the pillar will lower like an elevator.  Take this elevator up, jump onto the brown crates to the west, and then jump over onto the gray crates to the north.  From there, jump west across the gaps to the brown crates in that direction, and then the gray crates.  Jump across the next gap to the gray crate, and then navigate the gray crates over to the northwest.  Head over to the eastern edge of the last crate stack, and then jump on top of the console to register the secret.
 * 5) In the gray stone room with the toxic pool, there is one patch of wall in the south that is green. Open this wall and the one after it to access the brown sludge pit in the southern room.  Behind the mechanical structure is a secret alcove containing a bulk cell and a megasphere.  To exit the pit, take the elevator in the west of the alcove, and then lower the railway to the west.

Records
The Compet-N records for the map are:

The data was last verified in its entirety on April 10, 2014.

Map data
* The vertex count without the effect of node building is 2294.