E1M2: Central Computing (Double Impact)

Double Impact maps
E1M1: Maintenance Area E1M2: Central Computing E1M3: Research Complex E1M4: Hydroponic Facility E1M5: Engineering Station E1M6: Command Center E1M7: Waste Treatment E1M8: Launch Bay E1M9: Operations

This level occupies the map slot E1M2. For other maps which occupy this slot, see Category:E1M2.

E1M2: Central Computing is the second map of Double Impact. It was designed by Matt Cibulas (RottKing) and Ralph Vickers (Ralphis), and its music track is an untitled mash-up of "Dark Halls", "Suspense" and "The Demons from Adrian's Pen," all originally created by Robert Prince for Doom. The par time defined in the DMAPINFO lump of the edition released as official add-on is 11:00.

Walkthrough

Map of Central Computing

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.

Essentials

Head straight forward to a staircase and kill the monsters in your immediate vicinity, then head north to a junction with a blue floor and open the gray door to enter a curved hallway. Follow the hallway past zombiemen, imps, and a demon, to reach a button and push it to open a nearby closet containing more imps and zombiemen, then go back to the junction to find that the tan door has opened leading to a zig-zag bridge over nukage. Cross the bridge and climb the steps on the other side, then open the door at the top to enter a hall with several enemies. Go through either of the doorways in the north-east corner, then step on the lift in the north alcove to go down to a dark maze that contains plenty of monsters.

There are multiple paths leading away from the entry point, but head east to a low passage and pass through to enter the T-shaped room near the center of the maze. There is a narrow hallway on the east side of this room—follow it until you see a wall open in front of you and reveal a demon, quickly kill it (along with a spectre behind you on Ultra-Violence (UV) and Nightmare (NM) skill levels) then continue south through a corridor with bright lights, slaying any enemies waiting in the alcoves to your right as you go, then head round a corner to find some zombies guarding a switch that will lower the yellow keycard elsewhere in the map. Activate the nearby lift to leave the maze, then return to the starting area and head east down some steps to a room with a brown floor. Head through the angled door on the north side to find the yellow key, which is protected by several enemies.

Go back up the steps to the starting area, then head down the south-east staircase this time to reach a junction with a door leading east as well as paths going east and south. Take the south path and follow it to a junction with a yellow key door, open it, then head up either staircase to an angled room with zombies and imps. Activate the lift on the north side and ride it up to a blue-floored area, turn right and fight your way past some more enemies to reach a switch in a recess. Flip the switch, then take the lift back down and head south through a now-open door to some steps that lead up to the red keycard; taking the key will open four closets around you with imps, demons and zombies. Flip the switch inside the east closet to open the door so you can get back out, then go back through the yellow key door and head east through another door you saw earlier to reach the exit area. Head north through this area to get to the exit door, which requires the red key to open and pass through it to find the exit switch, guarded by a spectre and zombieman on Hurt Me Plenty (HMP) along with an imp on UV and NM.

Secrets

1. In the big brown-floored room south-east of the yellow key area is a south wall with a stripe on it. To reach it, walk up the steps going west, then southeast, and from where the door is, go north, looking back at the big room. While hugging the southeast wall near the drop, carefully walk along the ledge next to the south wall and press the part of it with the stripe to reveal a room with stimpacks, partial invisibility, a backpack, and a switch. (sector 362)
2. When you first enter the blue maze in the northern part of the map, you will have three paths to choose from. Take the central path, and when you reach the dead end, press on the gray wall to the west to reveal the blue key and a stimpack. (sector 322)
3. Come back to the entrance of the blue maze, take the west path, and press the part of the west wall with the brown ridge on its bottom to reveal a hidden part of the maze. (sector 395)
4. From secret #3, go to the western wall in the darkest part of the maze (northwest of secret #3) that has a caution stripe on it and metal bars next to it. Press it to find a light amplification visor, rockets, and armor bonuses. (sector 393)
5. After getting the blue key in secret #2, go back to the room with the zigzag bridge across the slime (southwest of the maze). Run across the nukage going west and open a blue door to find a stimpack, a medikit, two rockets, an ammo clip, and a backpack. (sector 249)
6. After pressing the switch in the maze that lowers the yellow key, enter the yellow key area to find several monster closets. The southwest one has a brown ridge at the top of its south wall. Press it to reveal three rockets and two stimpacks. (sector 289)
7. In the big room past the yellow door, go up the west staircase up to the third step (its bottom looks different from the other steps). Run to the east, then run south. Go through the window before it rises back to reach the secret. (sector 378) You will find shotgun shells nearby, and if you west across the slime, you will also find a rocket launcher and a box of rockets.
8. Come back to the big room past the yellow door, ride the north lift up, and go west to the south computer terminal that is slightly recessed in the wall. Press it to find three rockets and two stimpacks. (sector 276)
9. Once you get the red key, several monster closets will open. Go back to the big room and take the west staircase, entering the compartment to the north. Press the east wall there to find a soulsphere and a switch that opens secret #11. (sector 263)
10. After getting the blue key in secret #2, go back to the room just south of the exit door. There is another blue door here, which leads to a secret area with a medikit and a box of shotgun shells. (sector 273)
11. If you pressed the switch in secret #9, ride the lift up in secret #10 to reach a plasma gun (sector 270)
12. By pressing the switch in secret #1, you lower a barricade blocking a megaarmor next to the exit door. (sector 246)

Areas / screenshots

• 

  Starting room

• 

  Surviving an ambush

Speedrunning

Current records

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

Run	Time	Player	Date	File	Notes
UV speed	3:58.06	Punch_the_boulder	2026-01-27	dbimpacte1m2-35806.zip
NM speed
UV max	5:21.03	Boris Klimeš (dew)	2012-03-02	d1i2-521.zip
NM 100S
UV -fast	14:34.00	Punch_the_boulder	2026-01-30	dbimpacte1m2f1434.zip
UV -respawn
UV Tyson
UV pacifist
NoMo	1:23.49	Punch_the_boulder	2026-01-27	dbimpacte1m2o12349.zip
NoMo 100S	2:17.26	Punch_the_boulder	2026-01-27	dbimpacte1m2os21726.zip

The data was last verified in its entirety on February 23, 2026.

Deathmatch

Player spawns

This level contains twelve spawn points:

1. facing south. (thing 439)
2. facing north. (thing 440)
3. facing east. (thing 443)
4. facing west. (thing 444)
5. facing west. (thing 446)
6. facing south. (thing 447)
7. facing east. (thing 448)
8. facing south. (thing 449)
9. facing south. (thing 450)
10. facing west. (thing 452)
11. facing south. (thing 453)
12. facing south-west. (thing 454)

Statistics

Map data

Things	498
Vertices	1989*
Linedefs	2135
Sidedefs	2966
Sectors	413

* The vertex count without the effect of node building is 1683.

Things

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

Single-player
Monsters	1-2	3	4-5
Zombieman	48	72	85
Shotgun guy	21	38	65
Imp	38	73	87
Demon	11	14	16
Spectre	3	6	12
Weapons	1-2	3	4-5
Chainsaw	1
Chaingun	1
Rocket launcher	1
Plasma gun	1
Ammunition	1-2	3	4-5
Clip	6
Box of bullets	3
4 shotgun shells	20	19	17
Box of shotgun shells	1
Rocket	13
Box of rockets	1
Health & Armor	1-2	3	4-5
Stimpack	33	31	28
Medikit	5	5	3
Armor	2
Megaarmor	1
Items	1-2	3	4-5
Armor bonus	32
Health bonus	32	29	29
Supercharge	1
Backpack	2
Light amplification visor	1
Partial invisibility	1
Keys	1-2	3	4-5
Blue keycard	1
Red keycard	1
Yellow keycard	1
Miscellaneous	1-2	3	4-5
Exploding barrel	11

Multiplayer
Monsters	1-2	3	4-5
Zombieman	49	73	86
Shotgun guy	22	39	66
Imp	40	75	89
Demon	11	14	16
Spectre	3	6	12
Weapons	1-2	3	4-5
Chainsaw	1
Shotgun	4
Chaingun	4
Rocket launcher	1
Plasma gun	1
Ammunition	1-2	3	4-5
Clip	6
Box of bullets	3
4 shotgun shells	27	32	31
Box of shotgun shells	1
Rocket	13
Box of rockets	1
Health & Armor	1-2	3	4-5
Stimpack	33	31	28
Medikit	5	5	3
Armor	2
Megaarmor	1
Items	1-2	3	4-5
Armor bonus	32
Health bonus	32	29	29
Supercharge	1
Backpack	2
Light amplification visor	1
Partial invisibility	1
Keys	1-2	3	4-5
Blue keycard	1
Red keycard	1
Yellow keycard	1
Miscellaneous	1-2	3	4-5
Cooperative start	4
Deathmatch start	12
Exploding barrel	11

Trivia

• The south area of this level, with its twin staircases and secret outdoor area, loosely resembles the red key area from Doom's E1M2: Nuclear Plant.

External links

• Double Impact demos at the Doom Speed Demo Archive