MAP20: The Experiment (Memento Mori II)


Memento Mori II maps 11-20

01 02 03 04 05 06 07 08 09 10
(11 - 20)
21 22 23 24 25 26 27 28 29 30
Secret maps: 31 32
Top-secret maps: 01 02

This level occupies the map slot MAP20. For other maps which occupy this slot, see Category:MAP20.

MAP20: The Experiment is the twentieth level of Memento Mori II. It was designed by Alden Bates and uses the music track "Sacrifice" by David "Tolwyn" Shaw.

Mission briefing[edit]

According to both the text file and the Infopack:

Sector coverage:
Laboratories, Grade-A clearance required for assess [sic] to data.
Agent report follows:
I have gained access to the laboratories and observed some of the monsters at work. I don't know what this place was used for before the invasion, it looks like [portion of text censored] and the creatures seem to be using it for something.
At the moment I have reached the first laboratory. It looks to have carved [sic] from a natural underground cavern. Some of the small spider brains are supervising some zombies who are working on the [portion of text censored] and conducting what look like light-wave experiments. I thought I recognised one of the zombies, it may be a friend of mine. I'm going to try and make contact.
Later I'm hoping to go deeper into the labs. It sounds like they're testing heavy weapons further in.
+++ Report Ends +++
Last transmission recieved [sic] 3 days ago included visual scan. An enhanced version of this image is included with this report.


Map of The Experiment
Letters in italics refer to marked spots on the map. Sector, thing, and linedef numbers in boldface are secrets which count toward the end-of-level tally.


Take the elevator down, and rush to the northeast door. Enter the central door to find the yellow keycard. From there, what you must do depends on the path you take. If you take the western path, go through the western doors, enter the southwest or northeast teleporters, take care of the opposition, and grab the blue keycard. Head back to the teleporters, enter the northwest door, take the elevator, and tread along the walkway to the northern room. If you take the eastern door, flip the switch in the east side of the machine, enter the teleporter, open the door, kill the monsters in front of you, and grab the blue keycard. Head back to the teleporter room, enter the northeast door, take the elevator, cross the walkway in either path to trigger an elevator, and take that elevator up. Whichever path you take, once you reach the northern room, rush over, and grab both the red keycard and the rocket launcher. Backtrack to the very southern room, and take the silver elevator up into the computer area. With the red and blue keycards in your grasp, activate both of the computer controls to open access to the center of the room. Dash in there to open the exit door to the northwest, and then run into the newly accessible elevator to finish the level.

Other points of interest[edit]

In the western teleporter room, on Hurt Me Plenty or higher, there is a sergeant (a chaingunner on Ultra-Violence or higher) inside of the northwest pillar who will shoot at you through the southeast side. To kill them, you must fire into that side yourself. In addition, if you run into that side, you will obtain a medikit.


  1. After obtaining the yellow keycard, go through the western yellow door and open the metal door with grating upon it to the west. This reveals an elevator up to a secret corridor (sector 147) that leads to a rocket launcher.
  2. Return to the hallway north of the western yellow door and proceed northwards. In the western teleport room, enter the southwestern teleporter. After that, walk up to the wall with the skull upon it, and open it to access a hidden corridor (sector 29) with a set of shells and a super shotgun. Note that the super shotgun here may prove difficult to obtain unless you back against the opposite wall, and then bump into the stand it is on as quickly as you can.
  3. In the red keycard room, step from the walkway west of the nukage pit to the walkway north of the nukage pit and run as quickly as you can to the northeastern corner of the room, where you will find that an elevator (sector 178) has lowered to reveal a plasma gun.
  4. After accessing the computer area in the south of the level, look toward the southern side of the mainframe to find that there is a small recess. Open it to find 15 health bonuses, three clips, a box of shotgun shells, a backpack and a blue armor (sector 100).


The blue control panel does several things, including releasing a cyberdemon (thing 271) into a closed room with a crusher activated by approaching the exit door. This crusher takes around 50 seconds to kill the cyberdemon once it begins crushing. Both of these components (pressing the blue control panel, and approaching the exit door) can be postponed until the player is about to exit the map, making an unsuspecting player likely to miss a monster kill. There are a couple of ways to ensure the cyberdemon is dead before exiting:

  • Perform both actions as early as possible; bump against the exit door when starting the map, and use the blue control panel as soon as possible (and attack to alert him). This makes the cyberdemon die while the rest of the map can be played like normal.
  • If the player is about to finish the level with the blue control panel unused, the cyberdemon can be killed by activating the blue control panel (and attacking to alert him), entering the exit door alcove and then waiting before finishing the map.

The northeastern portion of the map (sector 9) has several issues with the teleporters in its toxic pits:

  • The teleporters do not work on the ITYTD and HNTR skill levels, making the toxic pits inescapable on these difficulties, because their shared teleport destination (thing 22) does not have the easy flag set to make it exist on these skill levels.
  • The northern side (linedef 88) of the southwest teleporter is facing the wrong way, making the player run straight across the platform instead of teleporting if they approach from the north.
  • A teleport destination in the southwest pillar (thing 23) is not connected to any teleporter, while the teleport destination in the northeast pillar is connected to both teleporters. The southwest teleporter was probably supposed to be connected to the southwest pillar.

Demo files[edit]

Areas / screenshots[edit]


Routes and tricks[edit]

This level is one of the few levels in Memento Mori II that can be completed in under a minute. As with designer Alden Bates's MAP10: The Mansion from Memento Mori, this level contains large, open areas with little opposition in proportion to size, with the exception of the platform on which you obtain the blue keycard, which has several enemies in a small space, as well as some tight spaces where you must kill some enemies, or at least stun them with gunfire, to get past them, and obtain a fast time under UV speed rules. Aside from that, you can ignore most of the monsters in this level, including the two cyberdemons that appear in the red keycard room (some time after you enter it,) and the exit room (after you open up the center of the room,) and zip to the exit in little time. The fastest path to take is the western one; ignore the teleporters when you first enter, and on your way back, enter the southwest teleporter to avoid leaving yourself open to the enemies below. Drop in, stun your foes with gunfire as you obtain the blue keycard, and then proceed to the exit as normal.

Current Compet-n records[edit]

The Compet-n records for the map are:

Run Time Player Date File Notes
UV speed 00:44 Karim El-Sheikh (Kimo Xvirus) 2009-12-16
NM speed 01:16 Eugene Kapustin 2007-10-28
UV max 04:14 Tatsuya Ito (Tatsurd-cacocaco) 2010-06-12
NM100S 01:35 Eugene Kapustin 2007-10-28
UV -fast 06:57 Tatsuya Ito (Tatsurd-cacocaco) 2010-06-12
UV -respawn
UV Tyson
UV pacifist 02:21 vdgg 2010-01-19

The data was last verified in its entirety on July 4, 2020.

Current DSDA records[edit]

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

Run Time Player Date File Notes
UV speed 0:44.14 Karim El-Sheikh (Kimo Xvirus) 2009-12-16
NM speed 1:16.60 Eugene Kapustin 2007-10-28
UV max 4:03.86 Andrea Rovenski (Cyberdemon531) 2023-02-28
NM 100S 1:35.54 Eugene Kapustin 2007-10-28
UV -fast 6:57.06 Tatsuya Ito (Tatsurd-cacocaco) 2010-06-12
UV -respawn
UV Tyson 30:34.34 vdgg 2018-11-23
UV pacifist 1:08.69 vdgg 2021-01-25
NoMo 0:42.97 Andrea Rovenski (Cyberdemon531) 2015-01-12

The data was last verified in its entirety on March 4, 2023.


Player spawns[edit]

This level contains four spawn points:

  1. facing south. (thing 18)
  2. facing east. (thing 19)
  3. facing south-west. (thing 24)
  4. facing south-east. (thing 25)


Map data[edit]

Things 357
Vertices 1298*
Linedefs 1362
Sidedefs 2048
Sectors 219
* The vertex count without the effect of node building is 1082.


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

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]