MAP21: Engine Core (Icarus: Alien Vanguard)


Icarus 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

This level occupies the map slot MAP21. For other maps which occupy this slot, see Category:MAP21.

MAP21: Engine Core is the twenty-first level of Icarus: Alien Vanguard. It takes place at the engine core of the exploration cruiser, Icarus, and was designed by Dean Johnson and uses the music track "Ripsnort" by Jeremy Doyle.


Map of Engine Core
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.


You only need the red key to finish this map. For the quick way, head into the hallway to the north. You can do this by pressing the switch on the area that you are on to open two garage doors, then climb the steps up heading westward through two doors. You can also climb the silver steps and take either northern door to reach the hall, then go westward through the door to appear in the large western hallway. Head through the door to the south and the door behind it. The red key will be in this room, so take it and run all the way back down the hallway to reach the "SIMU EXIT". Press the furthest panel on the right to exit.

Other points of interest[edit]


  1. At the start of the level, enter the doors, and then head through the western door and up the stairs. You will hear a door opening in the northeast. Run into the core facility as quickly as you can, and run through the newly opened door to find a megasphere. (sector 146)


A medium and hard difficulty imp (thing 221) is stuck inside stairs in the hallway room joining the walkways.

A body impaled on a stick (thing 227) placed between the dual walkways in the core room snaps up and starts hovering when the nearby door in the southeast (sector 19) is opened.

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 0:14.80 abyrvalg 2007-09-03
NM speed 0:20.46 Andrea Rovenski (Cyberdemon531) 2023-06-17
UV max 1:50.89 Andrea Rovenski (Cyberdemon531) 2022-10-29
NM 100S 0:20.77 Andrea Rovenski (Cyberdemon531) 2023-07-14
UV -fast 2:09.31 Andrea Rovenski (Cyberdemon531) 2024-02-12
UV -respawn 1:42.57 Andrea Rovenski (Cyberdemon531) 2022-10-29
UV Tyson 12:49.94 vdgg 2021-12-06
UV pacifist 0:17.74 vdgg 2020-08-22
NoMo 100S 2:18.31 TeamTNT 1996-04-17 Walkthrough demo

The data was last verified in its entirety on March 8, 2024.


Player spawns[edit]

This level contains ten spawn points:

  1. facing south. (thing 4)
  2. facing east. (thing 5)
  3. facing west. (thing 6)
  4. facing north. (thing 7)
  5. facing north. (thing 67)
  6. facing south. (thing 68)
  7. facing east. (thing 69)
  8. facing west. (thing 70)
  9. facing south. (thing 71)
  10. facing north. (thing 72)


Map data[edit]

Things 234
Vertices 1110*
Linedefs 1259
Sidedefs 671
Sectors 168
* The vertex count without the effect of node building is 1034.


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

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]