References to the Doom series in Doom 2016

The reboot of Doom contains numerous references, many in the form of easter eggs, to the classic Doom and Doom 3 series.

Achievements
A number of achievements in the game make reference to Doom games or related material:
 * E1M1
 * Received for beating the first level. Named after the first level of Doom.


 * Entryway
 * Received for completing the SnapMap tutorials. Named after the title of the first level of Doom II.


 * IDDQD
 * Received for upgrading all runes. Named after the Doom and Doom II cheat code for god mode.


 * IDKFA
 * Received for earning the masteries for all weapon mods. Named after the cheat code in Doom and Doom II that gives all weapons, ammo, and keys.


 * IPXSETUP.EXE
 * Received for winning a multiplayer match. Named after one of the programs used to set up a multiplayer game in Doom and Doom II.


 * Knee-Deep in the Dead
 * Received for beating the game. Named after the first episode of Doom.


 * No Rest for the Living
 * Received for playing five SnapMap levels. Named after the No Rest for the Living expansion WAD of the same name which was originally developed for Doom II on XBLA.


 * Rip and Tear
 * Received for performing a glory kill on all common enemy types in the campaign. Named after an infamous catchphrase from the Doom comic. This phrase is also referenced during the opening cinematic of the game as the awakening protagonist remembers a mission statement given to him long ago.


 * Shareware
 * Received for creating a SnapMap level. Named after the shareware model of software distribution, of which id Software was proponent in the early 1990s.


 * Shoot it Until it Dies
 * Received for killing the cyberdemon. Named after a fake protip image created by Doomworld founder and long-time community member Andrew Stine (Linguica).

Codex entries

 * BFG
 * The codex entry for the BFG begins with the phrase, "Witness the BFG-9000," another passing reference to the Doom comic, where the protagonist utters a similar phrase when he finally discovers the weapon.


 * Doom Marine
 * The second entry for the Doom marine includes a picture of a page taken from a book found in Hell known as the Book of Daeva. The picture resembles the original cover art as illustrated by Don Ivan Punchatz, featuring the same type of demon in similar positions, and the protagonist in a likewise similar pose in the midst of them.

Design elements

 * The external profile of the BFG bears a strong resemblance to the Bio Force Gun v3.14 from the Doom movie.
 * If the player suffers a gibbing death inside one of the classic Doom level recreations, the Praetor suit's helmet will display the evil grin from the original status bar face.
 * The Soul Cube can be found sitting in Olivia Pierce's office. It is additionally depicted in an engraving found in Argent D'Nur which appears to depict the battle of the ancient Martian hero from Doom 3, suggesting a connection between the games' continuities.
 * Fictional sub-contractor and supplier Mixom from the Doom 3 series is referenced throughout the game, with its logo on various technological objects.
 * A reward poster for a lost pet rabbit named Daisy can be found in one of the game's multiplayer levels.

Levels
Several entire levels are recreated for the game as secret bonus content:

Mini-games

 * A fully playable -style "match three" game, entitled Demon Destruction, can be found on a computer monitor. It in turn contains additional references:
 * The matchable items are all monsters from the classic Doom series.
 * It utilizes the same background which was used for Super Turbo Turkey Puncher 3 in Doom 3, a screenshot of E4M9: Fear.
 * The release dates of the original Doom and of Doom 3 are both referenced in the high score table, as an entry for 12101993 points by idMOM_DJ, and an entry of 832004 points by RPADuffy.
 * Super Turbo Turkey Puncher 3 itself also returns as a playable mini-game.

Music
The game's sound track, composed by Mick Gordon, contains numerous allusions to the original Doom sound track, as composed by Bobby Prince, and an additional reference to the Doom 3 sound track:
 * The theme of "At Doom's Gate" is prominently referenced throughout the game.
 * "Sign of Evil" and "DOOM (Doom 2)" can be heard in the menu theme, "Hellwalker".
 * "Harbinger" contains several excerpts from the "Doom 3 Theme" and ends with a theme derived from "E3M1 - Untitled".
 * "Dakhma" contains a high-pitched drone violin much like "They're Going To Get You".
 * A choral rendition of "Sign of Evil" can be heard in the conclusion of "Dakhma". This clip occurs in-game at the end of many battles in the game's Hell levels.
 * "Ties That Bind" uses the ambient intro from "The Imp's Song".
 * "Authorization; Olivia Pierce" is a full rendition of "Suspense".
 * At 5:48, "BFG Division" contains a short arrangement of "Waltz of the Demons".
 * "VEGA Core" contains a rendition of "E3M1 - Untitled" at 1:10, and "Into Sandy's City" at 7:08.
 * At 1:33, "Transistor Fists" contains a short arrangement of "Kitchen Ace (And Taking Names)".

References in dialogue

 * A hologram in Resource Operations states, "If you have any new suggestions to improve the work environment while working your tenure in Res Ops, please submit suggestion form WAD-E1M4 to your Command Controller." This both references the WAD file format, and the position and name of E1M4: Command Control.
 * Another hologram mentions that, for access to certain locations, "new advocates must submit a Delta-Q-Delta form to the Departmental Enforcer." This is a reference to the fictitious Delta-Q-Delta programming fraternity, which was the original source for the IDDQD cheat code.