MAP24: The Chasm (Doom 2 In Name Only)


Doom 2 In Name Only maps 21-30

01 02 03 04 05 06 07 08 09 10 11
12 13 14 15 16 17 18 19 20
(21 - 30)
Secret maps: 31 32 34

This level occupies the map slot MAP24. For other maps which occupy this slot, see Category:MAP24.

MAP24: The Chasm is the twenty-fourth map of Doom 2 In Name Only. It was designed by Antroid and uses the music track "Pseudoverum" by Josh Simpson (EarthQuake). The par time defined in MAPINFO is 5:00.


Map of The Chasm
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.


To finish this level you only require one of the yellow or red keys.

Kill five shotgun guys hiding behind the columns ahead then head north into a room with an impaled human. Go through the north doorway and kill a waiting chaingunner, then continue east until you reach a room with imps and a nukage pool - this is the north end of a river that runs through the entire map. Head down the steps on the east side, passing a couple of revenants, then kill a mancubus waiting at the bottom before continuing south into a cavern with another revenant and some imps. Head down the steps at the south end of the cavern to go down to the east bank of the river, then follow this bank south until the river turns westward; this section is overlooked by various monsters including a couple of arachnotrons. At this point the paths to the red and yellow keys diverge.

Yellow key[edit]

Step across to the north bank of the river and follow it west until you reach a brick ledge, go through the west doorway and kill some waiting cacodemons before dropping to the floor below. Go through the doorway in the south-east corner to return to the river, then head south towards a platform with a cyberdemon on it - directly west of this platform is a tunnel that leads to some brick ruins. Continue south from the ruins to some steps and climb them to face an arachnotron and some chaingunners, then go round the next corner to enter a hall with lots of rock pillars; kill the revenants and imps ahead then climb on the T-shaped platform in the middle of the hall before carefully running east and south across the pillars to reach the ledge on the south side where a mancubus is waiting. Dispose of the cacodemons and pain elementals that have been released behind you then follow the path west and north to another set of pillars that lead to a skull switch. Press the switch then drop to the floor and go to the east side where a pillar with a box of rockets is moving up and down - you can use this pillar to climb up to the nearby platform which has now risen, then run north to drop down a hole and find an arch-vile guarding the yellow skull key.

Red key[edit]

From the first bend in the river, head south to a brick doorway and go through it then head down some steps to get back outside. Follow the path south past the cyberdemon's platform and the ledge with the red skull key, then kill an arachnotron and chaingunner which are guarding a small wooden window. Step through the window to a cavern with shotgun guys then head east into a large cave with two islands, then follow the outer ledge east until you reach a wooden step with an arachnotron. Walk north to drop down to a ledge with a wooden doorway and head through it to confront three chaingunners, then climb up the nearby step to another doorway and go through it before crossing the bridge on your left to reach the north island. Head to the west side of the island to find some health bonuses and run west at this point to leap back to the outer ledge, then run south to dispose of an arch-vile that rises from the floor. After passing it, continue west past a revenant and chaingunner to get to the red key.


Once you have your key, drop down to the river path and follow it east to a large brick structure - if you have the yellow key then you should enter it from the north path, and if you have the red key you should enter from the south. Kill a waiting revenant and mancubus then follow the steps to a skull switch that will open the colored bars next to it, then go through to two sets of steps and climb up either set (the south is faster) before proceeding east to a cave with some brick buildings. Fight through some imps, revenants, mancubi and two arch-viles to the south end of the cave, where the river bends west, then drop down the holes on either side of the river to land in a cavern with orange pillars. At the south-east end of the cavern are three or four arch-viles protecting a skull switch; press that switch to lower steps in the south wall of the cavern, then head down the steps and follow the path east until you reach a large staircase. Go up the steps and run east until you get to the end of the river, then drop down the hole here to finish the level.

Other points of interest[edit]

After passing the colored skull bars, head up the south steps then turn right and go down another staircase to a room with green torches. If you have both keys then you can open the bars here to enter a room with a chainsaw, ammo, and health and armor bonuses.


  1. Go east along the northern part of the map across the blocks above the nukage. Keep going south past a room with a rocket launcher until you reach a cave with torches. From there, head west and north to the north-west corner of the ledge. Gently drop down and you should land on a berserk pack. (sector 466)
  2. When the nukage river first bends westward, go south and up the steps, then west and down the steps, but as you do, look along the northern wall. Find the section of brick wall that is darker than the rest and use it to reveal a switch. Shoot this switch to reveal another cave, and then shoot the switch across from you which is guarded by a revenant to open another rock in the same cave. Climb the rocks up and go west, then south. On the platform here, you can make a running jump south to reach a megasphere. (sector 235)
  3. On the west end of the map will be some broken ruins in a valley adjacent to the nukage river. Climb up these ruins and keep going north, up the steps, then to the ledge with the medikit and box of shotgun shells. If you look straight east from there, there will be a switch you can shoot. Do so, then drop off the ledge and head north into the next cave. A rock will have risen up here, so climb the steps to reach it, then jump onto the rock and west into the room with cacodemons from before. Climb these steps to find health and armor bonuses, as well as boxes of rockets. (sector 376)
  4. At the southern end of the block-filled room which leads to the yellow key, climb the steps and jump north-west to the wall that has a lighter portion of brick wall. It should lower revealing a cacodemon and a backpack. (sector 662)
  5. On the path leading to the red key, go to the western side of the area with brown sludge that has a window where you can see a small cave. You can make a strafejump from the higher ledge across this window to get a box of shotgun shells and a medikit. (sector 743)
  6. After opening either the yellow or red bars near the middle of the map, keep going east and eventually you will follow the nukage river southbound. Instead of following it, go north instead, following the bend to a small cave containing a plasma gun and an energy cell pack. (sector 837)
  7. Once you reach the end of the nukage river press the skull switch in the east to lower a rock so you can continue to the exit, but instead of going straight to the exit, head west and north through the nukage until you reach an abandoned room. (sector 909) Although there are no supplies to find here, the teleporter here will take you back to the floor above where you can collect an energy cell pack, a box of rockets and a box of shotgun shells.


Demo files[edit]

Areas / screenshots[edit]


Routes and tricks[edit]

Current records[edit]

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

Run Time Player Date File Notes
UV speed 1:07.74 Aleksey Kamenev (4shockblast) 2014-12-04 Cross-listed from Pacifist
NM speed
UV max 20:39.71 Bdubzzz 2021-09-30
NM 100S
UV -fast
UV -respawn
UV Tyson
UV pacifist 1:07.74 Aleksey Kamenev (4shockblast) 2014-12-04
NoMo 0:51.86 Aleksey Kamenev (4shockblast) 2014-12-05

The data was last verified in its entirety on April 3, 2022.


Player spawns[edit]

This level contains four spawn points:

  1. facing north. (thing 1024)
  2. facing west. (thing 1025)
  3. facing south. (thing 1026)
  4. facing west. (thing 1027)


Map data[edit]

Things 1028
Vertices 6553*
Linedefs 6883
Sidedefs 10133
Sectors 1066
* The vertex count without the effect of node building is 5560.


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

Technical information[edit]

Inspiration and development[edit]


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