References to the Doom series in Doom 2016

The Doom game contains numerous references, many in the form of Easter eggs, to the classic Doom and Doom 3 series, as well as  material such as the Doom comic and Doom movie.

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.


 * Spider Mastermind
 * The codex entry for the Spider Mastermind states that the Aranea Imperatrix was referenced prominently in a vade mecum found in the crypt of a destroyed tower in Hell, which the UAC dubbed "PL E2M8". This is a reference to.

Mechanics

 * The third level of enhancement to environmental resistance for the Praetor suit is named "Barrels O' Fun", after Doom II's.

Models

 * The external profile of the BFG bears a passing resemblance to the Bio Force Gun v3.14 from the Doom movie.
 * If the player suffers a gibbing death, the Praetor suit's helmet may display the evil grin from the original status bar face at random.
 * 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.
 * Dead barons can be found in Hell seemingly hung up to be used as a food source for other demons. This is a reference to a similar wall texture depicting dead barons in the original Doom.
 * Beating hearts can be found on some altars in Hell, a direct homage to a decorative sprite from the original game.
 * According to Hugo Martin, one of the possible death sequences for the mancubus in which its spine is left sticking up out of its corpse is a reference to the similar death animation of the mancubus in Doom 64.

Textures

 * Fictional sub-contractor and supplier Mixom from the Doom 3 series is referenced throughout the game, with its logo on various technological objects.
 * Z-Sec appears on many security-related textures near name and rank information for personnel. In Doom 3, Z-Sec was short for "Zombie Security" and referred to zombies made from UAC security officers.
 * A reward poster for a lost pet rabbit named Daisy can be found in one of the game's multiplayer levels.
 * One computer terminal references a Tei Tenga mining station, referring to the location suggested for the original Doom by Tom Hall in the Doom Bible. The same terminal also references Doom's release date of December 10, and includes labels near the bottom which match those on the texture in the original game, a texture which likewise refers to Tei Tenga.
 * Placards for the statues of the Doom Slayer and the Night Sentinels kept in Samuel Hayden's office reveal multiple references to Doom 3, including the classification of the Slayer's statue as artifact U9, a designation which is seemingly in sequence with the Soul Cube, which was dubbed U1, and references to Site 1 and Site 3 as the source of these artifacts.
 * A secret area in the Advanced Research Complex accessed from the restrooms contains posters for Quake and the classic Doom on a bloodied wall.
 * A computer monitor accessed by the marine during the search for the Helix Stone reveals the artifact's designation to be 273.IDDQD, another reference to the god mode cheat code.

Architecture

 * In the Foundry, a hand must be ripped off a dead captain's corpse in order to use it to bypass a security scanner. This plot element is taken directly from Tom Hall's Doom Bible.
 * The final arena of Kadingir Sanctum includes design elements taken from the Doom 64 level.
 * The Necropolis includes an arena which resembles the layout of Doom II's, and includes a battle with several mancubi.
 * The Icon of Sin also appears in the Necropolis as a dormant demonic edifice. Shooting it with the rocket launcher three times will reveal a secret, whereupon it fires a spawn cube using the original sprite from Doom II as its textures and plays the reversed sound of John Romero's voice.

Bonus levels
Several entire levels from Doom and Doom II are recreated for the game as secret bonus content. Each one is unlocked by finding small fragments of the levels which are scattered throughout the main single-player campaign and require pulling sometimes well-hidden levers.

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.

SnapMap

 * Some of the rock props reference the Doom movie in passing by referring to, who played the character of Asher Mahonin (Sarge) in the film. In particular, one states, "This country rock has a buddy named Karl", which also refers to , who played the lead role of John Grimm (Reaper).
 * A dead-end module called the O of Destruction advertises itself as a circle of death that offers hiding points for enemies and loot. These names refer to the two alternate titles of Doom II's