The computer game Doom consists of 36 levels in four nine-level episodes: Knee-Deep in the Dead, The Shores of Hell, Inferno and Thy Flesh Consumed (Thy Flesh Consumed was added in the upgrade Ultimate Doom). Levels 1-7 in each episode are regular levels, while number 8 is a boss battle; the ninth is a secret level that can be accessed from within one of the first seven. The levels are referred to as ExMy (episode x, mission y), but also have individual titles.
Knee-Deep in the Dead
The version of E1M4 in Doom 1.0 contained a structure that formed a swastika (visible in the upper-left center of the 1.0 map to the right), inserted as homage to Wolfenstein 3D (which was set in a Nazi base and had several swastika-shaped levels). The symbol was changed to a shape that only loosely resembles a swastika for version 1.4:
- "Yes, [in Commander Keen 5] there is a swastika in one of the levels, one of my levels to be exact, but I removed it shortly after the game was released because people were upset that an evil symbol was in a cute kid's game (the changed version is in the screenshot). It was a premonition of things to come, namely, Wolfenstein 3D. I also put a swastika in Doom's E1M4 as a Wolf3D reference, but I changed it later for the exact same reason."
One of the levels in the original three episodes that was changed for The Ultimate Doom is E1M1. The change consists of the addition of a hidden switch near the start of the level that opens a door to the courtyard. The revised E1M1 contains exactly 666 sidedefs. The other changed level in The Ultimate Doom is E1M8. The change consists of a hidden switch behind a wall in the right chamber of where the Barons of Hell come out. This switch allows you to return to earlier sections to get more ammo.
The band Lollipop Lust Kill wrote a song titled "Knee Deep in the Dead" paying homage to the game.
|E1M1: Hangar||John Romero||At Doom's Gate|
|E1M2: Nuclear Plant||John Romero||The Imp's Song|
|E1M3: Toxin Refinery||John Romero||Dark Halls|
|E1M4: Command Control||John Romero/Tom Hall||Kitchen Ace (and Taking Names)|
|E1M5: Phobos Lab||John Romero||Suspense|
|E1M6: Central Processing||John Romero||On the Hunt|
|E1M7: Computer Station||John Romero||Demons on the Prey|
|E1M8: Phobos Anomaly||Sandy Petersen/Tom Hall||Sign of Evil|
|E1M9: Military Base||John Romero||Hiding the Secrets|
The Shores of Hell
In E2M9, after 26 seconds playtime the song sounds almost exactly as Pantera's song "Mouth for War" from their album Vulgar Display of Power which was released in 1992.
|E2M1: Deimos Anomaly||Sandy Petersen/Tom Hall||I Sawed the Demons|
|E2M2: Containment Area||Sandy Petersen/Tom Hall||The Demons from Adrian's Pen|
|E2M3: Refinery||Sandy Petersen/Tom Hall||Intermission from DOOM|
|E2M4: Deimos Lab||Sandy Petersen/Tom Hall||They're Going to Get You|
|E2M5: Command Center||Sandy Petersen||Demons on the Prey|
|E2M6: Halls of the Damned||Sandy Petersen||Sinister|
|E2M7: Spawning Vats||Sandy Petersen/Tom Hall||Waltz of the Demons|
|E2M8: Tower of Babel||Sandy Petersen||Nobody Told Me About Id|
|E2M9: Fortress of Mystery||Sandy Petersen||(untitled)|
|E3M1: Hell Keep||Sandy Petersen||(untitled)|
|E3M2: Slough of Despair||Sandy Petersen||Donna to the Rescue|
|E3M3: Pandemonium||Sandy Petersen/Tom Hall||Deep Into the Code|
|E3M4: House of Pain||Sandy Petersen||Sign of Evil|
|E3M5: Unholy Cathedral||Sandy Petersen||Demons on the Prey|
|E3M6: Mount Erebus||Sandy Petersen||On the Hunt|
|E3M7: Limbo||Sandy Petersen/Tom Hall||Waltz of the Demons|
|E3M8: Dis||Sandy Petersen||Facing the Spider|
|E3M9: Warrens||Sandy Petersen||Hiding the Secrets|
Thy Flesh Consumed
- E4M1 contains a representation of the Nine Inch Nails logo.
- All the level names (except E4M9), and the episode title, are phrases taken directly from the KJV of the Bible. The list was compiled by Kevin Cloud, and John Romero assigned names to the individual levels.
- E4M2 is the level of all those John Romero contributed to DOOM and DOOM II that took him the shortest time to finish; he started working on it at midnight and was done 6 AM.
|E4M1: Hell Beneath||American McGee||Sign of Evil|
|E4M2: Perfect Hatred||John Romero||Donna to the Rescue|
|E4M3: Sever the Wicked||Shawn Green||Deep Into the Code|
|E4M4: Unruly Evil||American McGee||Suspense|
|E4M5: They Will Repent||Tim Willits||Waltz of the Demons|
|E4M6: Against Thee Wickedly||John Romero||They're Going to Get You|
|E4M7: And Hell Followed||John Anderson||Sinister|
|E4M8: Unto The Cruel||Shawn Green||Demons on the Prey|
|E4M9: Fear||Tim Willits||Hiding the Secrets|
- Level credits: "Doom Credits" (last updated 7 January, 1998, retrieved 27 October, 2004) by John Romero, available as part of the archived copy of Lee Killough's Doom pages on Romero's website. This list is slightly different from the "Who designed which levels?" FAQ (last updated 22 August, 1997, retrieved 27 October, 2004) by Frans P. de Vries, maintainer of the rec.games.computer.doom newsgroup FAQ, based on a list from Sandy Petersen. The main difference is that Romero's list acknowledges Tom Hall as co-author of several maps.
- Trivia: 1998 interview with John Romero by Doomworld
- Doom I/II music from Doomworld
- Doom Wiki - Maps and walkthroughs of Doom levels