"Over the centuries, mankind has tried many ways of combating the forces of evil... prayer, fasting, good works and so on. Up until Doom
, no one seemed to have thought about the double-barrel shotgun
. Eat leaden death, demon..."
, id Software
's December 1993 follow-up to Wolfenstein 3D
, was a big step forward in the art of texture mapping, and an even bigger step forward in video game violence. It follows the story
of an unnamed Space Marine
posted to the Union Aerospace Corporation's base on Phobos, one of the moons of Mars. When teleportation experiments between Phobos and Deimos cause Deimos to vanish and a horde of grotesque monsters to invade the Phobos base, our hero is the only human left alive between the two bases. He fights his way through the creatures in search of a way off Phobos, finding himself transported instead to Deimos, now residing in the creatures' homeland, which turns out to be none other than Hell itself.
The release of Doom
was met with unprecedented controversy regarding its content. Not only was there a very high amount of frank Satanic imagery (albeit all cast in a highly negative light), it was filled with graphic depictions of zombies and monsters being blown apart
, eviscerated, shot to pieces and generally disintegrating into piles of gore
. Gameplay was extremely gung-ho — the makers noted that the manual could have simply read, "If it moves, kill it" — and encouraged the player to attack with reckless abandon, using such implements as chainsaws, chainguns and the original BFG
, a massive weapon which could reduce an entire room of monsters to viscera. Even the player's own face, shown near the health counter as in Wolfenstein
, became battered and bloodied with damage.
Also, whereas Wolfenstein
's fortresses all had identical lighting, Doom
featured variable lighting, including flickering and glowing lights, adding to the game's atmosphere. The game also introduced vertical height, rather than the horizontal-only format of Wolfenstein
. The game also introduced the idea of multi-player death matches
and co-op missions
in a modern FPS, with its developers fully expecting Doom
to be the biggest cause of decreased productivity in IT companies the world over in 1993. And they were right
Followed by Doom II: Hell on Earth
(1994), which saw the demons invading Earth, which was a huge success. In between Doom II
, Final Doom
was released the same month as Quake
. It was identical to Doom II
, but came with two different Expansion Packs
: TNT: Evilution
, created by the third party modding
group TeamTNT (originally intended to be free until id struck a publishing deal with them;) and The Plutonia Experiment
, made by two members of the group in four months' time, generally considered the hardest of the official packs. (Final Doom
also included a 32-bit Direct X
version of the Doom engine, making it the only way to play classic Doom
on many modern 64-bit Windows machines, besides virtual machines like DOSBox
or the many source ports.)
A decade later, Doom 3
(2004) was released. The third installment, which was a reboot rather than a sequel, breaks with the first two significantly, with a dark, oppressive tone much more akin to a Survival Horror
than anything. It was this incarnation on which the movie
was based. This was followed by the expansion pack Resurrection of Evil
, set two years later. The game was remastered in HD, compiling the first two games with it, in addition to adding another eight levels to its campaign. Furthermore, you can actually wield a flashlight and a gun at the same time
. This compilation, titled the BFG Edition
, was released in October 2012.
At Quake-Con 2014, id Software revealed Doom
, a reboot of the franchise, known to most fans as Doom 4
. To prevent any leaks, the only people who attended the convention were allowed to see gameplay of Doom
. Descriptions of the footage mentioned that Doomguy will be able to double-jump
, and be able to perform finishing moves
, such as tearing an enemy's heart out then forcing them to eat it
, almost akin to Brutal Doom
used to be known as Doom 4
when it was revealed in 2007, but the game went through Troubled Production
, so id decided to revive it.Doom
has been ported to many, many console systems over the years. The PlayStation
and Sega Saturn
versions combined levels from both Doom
and Doom II
alongside a large number of unique missions; more original levels were released in a sequel entitled Final Doom
. There was also Doom 64
for the Nintendo 64
, which was an entirely new entry in the series and probably more of a Doom 3
than the actual Doom 3
was (it was released years before, ran on a modified version of the original engine and continued the story of the first two games). Doom
's source code has been released, and, at this point, almost anything with a CPU in it — many cameras and music players, some watches, several appliances, even a graphing calculator has been shown to run it for about half a minute before crashing — has had a version of Doom
released for it. The game used a creepy and distinctive sound effect for doors opening
, which has been re-used in many Speculative Fiction
series for all sorts of things.
Also, a comic
for Doom was made
at the height of the dark age
. It's hilarious, probably intentionally so. We hope
There was also a series of novelizations by Dafydd ab Hugh and Brad Linaweaver
. Four in all, the first two—Knee Deep in the Dead
and Hell on Earth
—were based on the first and second games, respectively. The final two, Infernal Sky
went their own direction with the plot. These novels have a small cult following. There are also two novels based on Doom 3
by Matthew Costello, who also wrote that game's script.
As for other products in the franchise, there are two cell phone-based RPGs
, an iOS-based Rail Shooter
, and a board game with expansion pack.
Notable Doom mods with their own page are:
This game provides examples of:
- 100% Completion: The classic games has percentage counter for how many monsters were killed, items, and secrets found in each level.
- Abandoned Mine: "The Abandoned Mines" in Doom II. Granted, it doesn't look much like actual mines (then again, no level in the classic Doom games looks like anything) and it's supposed to be located in Hell, but it does have areas that look like giant underground excavated caverns which probably inspired the level design of Doom 3.
- Actionized Sequel: While Doom I is fast-paced, it is generally willing to have scary moments as shown with several fights through a maze filled with Pinkies and imps while the lights flicker on and off. The second game goes for the "EXPLOSION TIME" brand of fun people associate with the series. The third slows things right down and adds in more Survival Horror elements to the mix.
- It is also inverted before Doom 3 showed up: in between Doom II and Doom 3, there was Final Doom and Doom 64. Final Doom was a Doom II style death orgy that had two whole level packs. Doom 64, however, is a horror game with just this spooky droning soundtrack.
- Adaptational Wimp: Councillor Swann. In the game he's decisive and effective, in the novelization he's a standard spineless Obstructive Bureaucrat.
- All There in the Manual: The backstories to just about all the classic series games.
- Also, the novelizations are the only time "Doomguy" is given a proper name (for those wondering, it's Flynn "Fly" Taggart for the classic series novels, and John Kane for the Doom 3 novels). Word of God is that the games' protagonist is deliberately not given a name because it's supposed to be you, the player.
- Always Accurate Attack: The arch-vile's attack will always hit the target unless it leaves the line of sight before it finishes. Only the marine can effectively dodge it. Partial invisibility won't cause it to miss, but does affect the knockback direction.
- Always Chaotic Evil: The demons all have nothing but malicious intent towards everyone and everything around them, even other demons
- Ammunition Backpack: As a power-up. Not only does it give you one of each "small ammo pack" (one pistol clip, four shotgun shells, one rocket, and one 20-volt energy cell), if it's your first, it doubles your ammo-carrying capacity (You can carry 400 bullets instead of 200, and so on).
- Ancient Astronauts: In Doom 3, Earth had been colonized by ancient Martians — who seems to be humanoid creatures with the same size and width as Humans — who teleported there to escape a demonic invasion. Some scientists ask themselves if the Martians are ancestors of Mankind.
- And I Must Scream: Some crushing floors in the first two games only crush, they never release. If you let yourself be smashed by these and happen to have enough health, you'll remain trapped alive in concrete. Have a nice stay if it's multiplayer and no one else can find and kill you to release you. Thankfully, a rather rare bug.
- And Your Reward Is Clothes: A meta-example: the Xbox LIVE Arcade port of Doom II offers two Avatar Awards. You'll get a Doom t-shirt for finishing the regular game, while completing the XBLA exclusive episode "No Rest For the Living" will net you a full Doomguy costume.
- Anti-Frustration Features: In Doom 3, if your health is lower than 10 and you go into the next level, the game will bump your health up to 25 percent to give you a fair chance.
- Apocalyptic Log: All over Doom 3.
- Arm Cannon: The Cyberdemon and the Mancubus, and the Bruiser in Doom 3's Resurrection of Evil.
- In Doom 3, the BFG isn't so much wielded like a gun as it is worn like a giant glove of death. The only one who actually carries the BFG is Sabaoth/Sergeant Kelly.
- The Artifact: The computer screens in the star textures contain the text "Tei Tenga" left over from Tom Hall's Doom Bible where the game was planned to be set. After Tom was voted off the island the game moved to Mars' moons.
- Artifact Mook: When you add up all the bodies, the extensive bloodstains, the skeletons, the zombies and the Lost Souls you fight in Doom 3, there seem to outnumber the human population in an area quite a bit.
- Artifact of Doom:
- The Artifact from Resurrection of Evil, which is a large heart with bits of metal attached.
- The Unmaker from Doom 64, apparently carved from Demon's souls.
- Also the Soul Cube from the original Doom 3 although that was created to defeat the demons, rather than by them.
- Artificial Brilliance: In Doom 3, the enemy's combat A.I. is very simple, but their path-finding A.I. is actually remarkably well-done; if you use an elevator or ladder to escape from a charging enemy, they can actually circle around the entire map to make their way to your new location. This is only noticeable if you go out of your way to toy with the A.I., however.
- Artificial Stupidity: It doesn't matter if a fellow monster is in the way, all monsters will start attacking upon sight of the player, and if their attack connects to a fellow monster, they'll turn on each other. Players who are out of ammo will quickly learn to start triggering in-fights. The term "monster infighting" was coined to describe this (especially when other games began featuring the same thing). There are some levels in Doom II in particular where the only way for the player to survive (barring the use of cheat codes) is to trigger in-fighting to either reduce enemy numbers or get other monsters to take out or weaken one of the big bads like the Cyberdemon.
- Ascended Glitch: Oh, wow. Lots. Most of them have been used and abused for speedruns and map-making.
- If an Archvile resurrects a monster who was crushed by a Descending Ceiling, that monster will become a "ghost" that can pass through (or over) obstructions and is invulnerable to everything except splash damage and other monsters' melee attacks. Once this bug was discovered, several custom maps were designed to produce this effect.
- Similarly, the shimmery "hall of mirrors" effect that occurs when a texture is missing has been adopted by some level designers to create deep water. It will still glitch if your view is below the water level, however.
- Also the "voodoo doll" bug, which can be easily created by placing two different start points for a single player. Clever mapmakers have used this bug to create traps which can teleport a player into another copy of himself, resulting in a recursive Tele-Frag (MAP30 of TNT: Evilution is an example). Voodoo dolls under triggered crushing ceilings can also be used to cause player deaths wherever the mapmaker wants; for example, simulating bottomless pits by triggering the ceiling if a player falls into one.
- Because the first two Doom games aren't true 3D, a rocket's splash damage isn't a sphere as might be expected; it's a cylinder of infinite height. This bit of questionable behavior, combined with actors being infinitely tall as far as collision is concerned, is what allows you to damage Doom II's final boss.
- It is possible to mess with sectors and sector references to create an "invisible staircase" effect, which was best demonstrated by a map called UAC_Dead. This in fact abuses the same glitch as deep water effect above, just the water doesn't need some of the set-up needed for bridges.
- If you trigger an action to move the floor up, but the target height is lower than current height, then the floor will move instantly (and the other way round, if floor should be moving down but the target height is higher, it will move instantly too). Combined with "invisible bridge" effect above, this allows for a fake 3D bridge which can be passed over and under, by moving the floor depending on where the player is. This is used in some custom maps.
- It is also used heavily in Doom 64 to create bridges and tunnels
- Asteroids Monster:
- In Doom II, The Pain Elemental will spawn up to three Lost Souls when it's destroyed, in a triangular formation.
- However, if you let it live, it'll continually spawn them. Get a Pain Elemental into a Let's You and Him Fight with another monster, and it'll spit the things like missiles. (Presumably, because if it just kept spawning them, the programming's not quite up to letting these new Lost Souls attack the monster that hit the Pain Elemental, not them.)
- In the "Doom II RPG" for mobile devices, the Spider Mastermind will explode into three Arachnotrons.
- A.I. Is a Crapshoot: Zig Zagged in Doom 3's backstory. Sentry bots are powerful fighters and efficient guides whenever you see them, but there were at least two instances where they became a threat to innocent personnel before the invasion. One seemed to come from an error during the system booting, the other because of a worker's simple refused clearance. In both cases, the reporter vehemently questions the bots' artificial intelligence and excessive firepower. Thankfully, they never attack the player in actual gameplay.
- A-Team Firing: Normally, monsters fire directly at the player, allowing the player to dodge. If you collect the Partial Invisibility power-up, enemies will fire wildly in your general direction (and miss more often than not.) Ironically, this can actually make it harder to avoid getting hit sometimes if you pick up a bad habit of dodging projectiles or if there are a lot of enemies in an area, because you can accidentally dodge into one of the stray ones.
- Attract Mode: Doom and Doom II (and their kin) play a demo if left on the title screen for a second or two.
- Auto-Save: Many source ports, such as ZDoom or Zandronum, auto-save whenever the player enters a new level, whilst also having the option of manual saves.
- Awesome but Impractical: The laser sight that replaces the crosshair in Doom 3: BFG Edition if you're playing in 3D mode. It's a lazy, cheap hack that does not actually point at where your weapon actually fires, and also sways with your gun for further confusion. This is most noticeable in the first few levels, where you'll find it extremely difficult to get pistol headshots on zombies, or cr0wn the imp with one shotgun blast. Once you start getting automatic weapons it becomes tolerable, as you can just blast your way through the rest of the game without worrying too much about precise aim thanks to the increased ammo availability of the BFG edition.
- The Berserk pack. The healing part is alright, but the Berserk pack also increases the strength of your fists, to the point that you can explode imps and zombies with them. But why would you risk rushing into a horde of enemies to punch them to death one at a time while the others tear you to shreds (fortunately, mouse controls make melee combat much less unwieldy and more feasible.)
- Back That Light Up: The Game Boy Advance version of Doom had more than one color scheme to compensate for the different lighting possibilities for that system.
- An early patch added several "gamma correction" settings to lighten the game, to help compensate for terrible monitors commonplace at the time.
- Badass Boast:
Swann: "This is the last time. I'm tired of running damage control every time he makes a mess."
Campbell: "Right. You're the control, and if that fails, I'm the damage."
- Unusual for a Doom boss, Sabaoth is quite vocal, shouting demoralizations at you as you fight. To be fair, back when he was your sergeant, he apparently didn't think much of you then, either.
- Badass Normal: The marine: So Badass that in Doom II, he destroys Hell.
- BFG: The one... THE ONLY.
- Big Red Devil: The Cyberdemons and the Barons of Hell.
- Bittersweet Ending: The unnamed marine in Doom 3 succeeds in sealing off Hell and survives, and is found by the subsequent reinforcements, but innumerable lives were lost beforehand.
- Downer Ending: The unnamed marine in the first Doom succeeds in escaping Phobos, climbing down from Deimos and escaping Hell itself, only to find that the demon invasion has already taken hold on Earth, with billions being slaughtered. The End! (Ultimate Doom's fourth episode and the sequel has you saving what's left of humanity and ends on a triumphant note, at least.) There's even a miniature downer ending in the first episode, where you're transported into a darkened, inescapable room full of demons, and it's lampshaded by the game-ending text. Thankfully, you survive to go on to the next episode.
- Earn Your Happy Ending: A common interpretation of the vague ending of Resurrection of Evil. By the climax, every single person besides the marine and Dr. McNeil is dead. McNeil orders the marine to shut down all the core systems in Phobos Labs, including the life support system, to power up the old teleporter so he can reach the old Delta Labs and eventually Hell itself to return the artifact and stop the invasion. After battling his way through the demons, the marine reaches Betruger/Maledict and is mortally wounded in the battle, but manages to destroy him with the artifact using his last ounce of strength. As the screen fades to white, McNeil's voice can be heard saying "Marine, welcome home", implying that the two are in a better place for their sacrifice.
- Black and White Morality: All the Doom games, really. Monsters from Hell trash humanity For the Evulz. You have lots of guns. Monsters gooify quite nicely. There's not a lot of ambiguity when it comes to what you're supposed to do.
- Blackout Basement: Some of the areas in Doom 3.
- Blatant Item Placement: In Doom/Doom II, it's rare that item collection triggers an ambush or trap, but some do exist. However, some items are shown on display (e.g. the armor in E1M1) for no reason.
- Blood from the Mouth: Doomguy's portrait whenever his health is low enough.
- Bloody Bowels of Hell:
- A lot of the "hell" levels of the original Doom and Doom II.
- Hell starts to get its bowels all over the UAC base on Mars in Doom 3. Ew.
- Strangely, when you actually get to Hell itself there's not much in the way of fleshy bowels. Most of the environments are regular old stone.
- Body Horror:
- Happens to Sergeant Kelly, who gets fused into a tank, and Dr. Betruger, who gets partially consumed by a demonic dragon.
- The original Doom games also have plenty of walls in the hell levels appearing to be made of human flesh, faces, or piles of corpses.
- Boring Return Journey: The end of Doom II has your character taking the long trek back home after practically destroying Hell.
- Boss Arena Idiocy: The final boss of Doom II is a giant invulnerable face in the wall of an arena which spawns endless monsters from the hole in its forehead; its only weak spot. You can shoot rockets into the hole to kill it, but such a task would be impossible if not for the arena providing a convenient elevator that reaches the height of the brain hole.
- However (even though ports supporting mouse aim do indeed ruin the level), this level is still not all that easy to win: While the elevator rises to ca. the height of said hole, firing a rocket when the player has already reached the top is rather useless since the rocket will hit a spot slightly above the hole and do no damage whatsoever. Therefore shooting the rockets has to be timed precisely. Moreover the process has to be be repeated at least three timesnote , which can render the level a bit frustrating, especially on higher skill levels.
- Boss in Mook Clothing: Archviles, Mancubi in Doom 3, Barons of Hell, Hell Knights in Doom 3, Bruisers in Resurrection of Evil. Also, a huge chunk of the custom monsters in ZDoom's realm 667 beastiary.
- Swastikas in the E1M4 were changed in later versions to allow the game to be sold in Germany. Also, German versions of Doom II do not contain levels 31 or 32.
- The Game Boy Advance ports of Doom I and II had all the in-game blood turned green. Ironically, the SNES port of Doom retained most of the original game's red-blooded violence, with only the Satanic symbols being censored.
- The BFG Edition and XBLA version of Doom II completely purges the secret Wolfenstein 3D levels of every Wolfenstein element: No Swastikas nor Hitler portraits, the SS guards are replaced by zombiemen squads, the unique map music themes have been replaced by the theme of MAP05 for both maps and the level names have been renamed ("Wolfenstein" to "IDKFA" and "Grosse" to "Keen").
- Brainwashed and Crazy: Hinted that this was Sergeant Kelly's fate.
- Brutal Bonus Level: The second secret level of The Plutonia Experiment, "Go 2 It". Oh hell!
- You think that's bad? The Plutonia 2 equivalent, unsubtly named "Go 4 It", is the same again... on steroids.
- Plutonia Revisited ups the ante again with "Have @ It".
- Doom 64's "Hectic" is a very tiny level with a small handful of enemies, but is packed to the brim with dirty tricks and One-Hit Kill traps (the first room of the level is full of power-ups that will kill you if you try to get them, except for two you can only get in a very specific way.)
- Cancellation: Only two of the three planned Doom 3 novels were released; the third got canned.
- Canon Welding: The cell phone RPGs are in the same continuity as Wolfenstein RPG, which features the "Harbinger of Doom" as the final boss. The Harbinger gets his arm and leg blown off and swears to avenge himself on B.J.'s descendants, becoming the Cyberdemon.
- Captain Ersatz: The Spider Mastermind, a brain operating a mechanical spider body, very closely resembles Krang from Teenage Mutant Ninja Turtles. If only he'd asked Shredder to make THAT body...
- Chainsaw Good: Fondly remembered and one of the iconic weapons of the series.
- Taken Up to Eleven in Doom 64, where the chainsaw has two blades.
- Doom 3 actually provides an explanation for why a base on Mars, which has no trees, would have chainsaws-they got mixed up with an order of jackhammers for mining.
- Classic Cheat Code: iddqd, idkfa, idchoppers, and so on.
- Clothing Damage: As seen in the page image, Doomguy's uniform is heavily damaged in most official artwork. Amusingly, this led to some players thinking that his armor was issued with an abdominal cutout.
- Compilation Re-release: The classic series has been included few compilations across PC and other platforms.
- The id Anthology not only compiles of all the classic Doom games, it also includes Wolfenstein 3D, Quake, and the entire Commander Keen series across four CD-ROMs. This collection also added some bug fixes to TNT: Evilution and The Plutonia Experiment.
- The Depths of Doom Trilogy is a PC compilation that included Ultimate Doom, Doom II, and Master Levels for Doom II across three CDs, along with the shareware version of Heretic, an amateur set of levels called Maximum Doom, and DWANGO version 2.02 for multiplayer at the time.
- Doom: Collector's Edition for PC includes Ultimate Doom, Doom II, and Final Doom on a single disc. It also allows players to play the classic Doom games without using virtual machines such as DOSBox or source ports.
- The BFG Edition includes Doom and Doom II, albeit the Xbox LIVE Arcade ports that have various alterations including the censored versions of the Wolfenstein 3D secret levels in Doom II... on the plus side, it gives PC gamers a chance to officially play the Doom II XBLA-exclusive episode "No Rest For the Living". In November 2012, the PlayStation 3 received another compilation called Doom Classic Complete, which includes the original two games plus "No Rest for the Living", as well as Master Levels for Doom II and Final Doom.
- Completely Different Title: When the game was released in Japan on DOS/V (a DOS system with native Japanese language support), it bore the title "3D Alien Busters DOOM". This version is the only one to be distributed by SoftBank with Imagineer, the game's original Japanese publisher. An earlier port to NEC's PC-98, as well as all later ports of the game, avert the trope, however.
- The Computer Is a Cheating Bastard: A combination of Fake Difficulty and bastard map-designers, it does not matter how carefully a player clears rooms and watches dark corners as there will always be tiny, function-less, hidden, and effectively-invisible closets containing idle monsters whose sole purpose is to surprise the player from behind.
- And, to a lesser extent (at least in the base game), there's the fact that due to the way Hit Scan enemies (i.e., riflemen, shotgunners, etc) are programmed, they will always hit you unless you get behind cover (if they don't miss due to spread), even if they're on the other side of the map from you. While this doesn't matter much in the enclosed spaces of the base game, in some custom levels favoring open spaces, this can get very annoying.
- Container Maze: Some parts of E2M2: Containment Area in the first Doom is basically a maze of crates with UAC supplies.
- TNT Evilution Map 11: "Storage Facility" takes this Up to Eleven.
- Continuity Snarl: In the end of The Lost Mission, The Bravo Team survivor and Dr. Meyers are both successfully rescued from Mars. This contradicts the opening screen of Resurrection of Evil, where it says that only one survivor (the Doom Marine) was ever found on Mars.
- Contractual Boss Immunity: Cyberdemons and Spider Masterminds are immune to splash damage. They only take damage from the rocket itself, not the explosion.
- Corrupt Corporate Executive: The UAC and particularly its leadership are explicitly capable of operating outside of all ethical and legal restrictions. They're a rare non-villainous version (for now), in that they are not stupid like Umbrella Corp in believing that unleashing hellish monstrosities is a GOOD idea. The main antagonist, Dr. Betruger, is in fact infamously at odds with them due to his reckless behavior even prior to the game, and the company's two representatives from the top wind up saving the human race if you make the mistake of calling for the fleet. They're also explicitly attempting to help the bizarre conditions on the Mars base as well.
- The Corruptible: The Lost Mission clarifies how Dr. Bertruger ended up allying himself with the forces of Hell. apparently, he was already into the occult, and when the teleportation experiments began the demons contacted him in his dreams and offered him vast power in exchange for Earth.
- Covers Always Lie: The cover of the first game shows Doomguy holding what seems to be some kind of sub machine gun or small assault rifle, despite the game having no such weapon. It did, however, exist in the alpha — but that weapon was turned into a chaingun during development.
- It eventually made its way into Doom 3, albeit with a redesigned appearance.
- Critical Existence Failure: Played straight for all enemies. Cyberdemons, Spider Masterminds, and Arachnotrons are more justified with the former launching rockets and the latter two being mostly robotic.
- Cut-and-Paste Environments: It has been noted that many areas in the new "Lost Mission" campaign in Doom 3 BFG Edition are simply made up of rooms from vanilla Doom 3 copy and pasted together.
- Damage Discrimination: With the exception of bullets, monsters are immune to their own kind's projectile attacks.
- Damage-Sponge Boss: Cyberdemons and Spider Masterminds.
- Although they weren't bosses (except for the 'Bruiser Brothers' at the end of the first episode) Barons of Hell were considered to have hit points WELL out of proportion with their actual threat level. This led to the introduction of Hell Knights in Doom II, which were about as dangerous (their plasma orbs and claw attacks did the same damage), but only half as tough.
- Damn You, Muscle Memory: Doom 3: BFG Edition maps sprinting to the left thumbstick button like most contemporary shooters. But while those shooters only require you to tap the button once, in this game you have to hold it down to sustain the sprint. This can also be confusing for those that have played the original Xbox version where the sprint button is mapped to the left trigger.
- Darker and Edgier: Doom 3. Definitely darker (har har), but it includes a storyline and several PDAs one can find to expand on how Hellish (har har) UAC became. It also introduces a lot more Survival Horror elements and contains jump scares, and makes combat a bit slower.
- Just to amplify the difference, you can take a look at the photo gallery. Guess which ones are made in Doom 3.
- Even the original games get progressively darker. Where Doom had most of the game with a soundtrack of rock and metal, Doom II opted for slower, darker, mood setting music. The PlayStation and Saturn versions of Doom and Doom 64 went even further, introducing darker music, and remodeling/revoicing the demons to appear far more intimidating. Some parts of Doom 64 are downright scary.
- Dead Character Walking: Has such a bug, described in detail here, where a players killed in deathmatch becomes a mobile corpse which runs (okay, slides) around. Kinda creepy.
- Dead End Room: the exit chamber of MAP12, though it doesn't prevent you going forward, it only prevents you re-entering the rest of the map. See also And I Must Scream above.
- Deadly Dodging: A major tactic is to slip between enemies (or at least ensure one is between your attacker). If one enemy damages another with a ranged attack or barrel explosion, this results in monster in-fighting (generally resulting in one of the enemies dying.)
- Deal with the Devil: Literally in Doom 3, between Hell and Dr. Betruger.
- Death Activated Super Power: Pain Elementals can summon up to three Lost Souls upon their death.
- Death by Cameo: In Doom II, John Romero's head is the Big Bad (more accurately, the Big Bad's hit-box, and it can only be found using the "idclip" cheat and walking INTO the boss' brain). And the body of the designer of level 24 of the fan-made Doom II level pack Requiem can be seen upside down on a cross in that level.
- Degraded Boss: Barons of Hell, Cyberdemons, Spider Masterminds...
- The Vagary from Doom 3.
- The first two Hell Knights in Doom 3 (a Bruiser Brothers homage) are much stronger than any subsequent specimens.
- Demon Slaying: You'd better believe you're going to be doing this a lot.
- Descending Ceiling: Some cleverly disguised.
- Determinator: No matter how inadequately prepared or out numbered Doomguy was, he never buckles when taking on the legions of Hell.
- Devil but No God: Besides the Soul Cube in Doom 3, there's not a holy thing in sight.
- Doom RPG 2 gives us the Soul Cube, Holy Bible (as a useless random pickup) and a Holy Water Gun, which instantly blesses any water put in it. Yes, even TOILET water. And you can drink from it too.
- Diagonal Speed Boost: Strafing and running forward simultaneously is faster than doing either independently.
- Did You Just Punch Out Cthulhu?: The Icon of Sin. Did you just blow the Devil's brains out?
- Diegetic Interface: Probably averted in the whole series (although the HUD could be indication shown inside the player Power Armor), but the trope explicitly appears in Doom 3: when the player is wielding a machinegun, the ammo counter disappears from the HUD and is replaced by a number displayed on the weapon itself.
- Difficulty Spike: The first two levels of Episode 4 are the hardest in the first game. Everything after that, though still pretty damn hard, pales in comparison.
- Digitized Sprites: Many monsters were made from clay and then converted to sprites.
- Distress Call: How both the original game and the movie start.
- And what you're spending the first half of Doom 3 trying to send, before spending the latter half trying to close the hell portal before your reinforcements arrive.
- Do Not Run with a Gun: The player is the only entity in the original games able to fire and move at the same time. Some mods change this.
- Doomy Dooms of Doom: Uh...
- Drought Level of Doom:
- Doom II's Level 9, "The Pit", is famous for not having quite enough ammo to destroy all the monsters, even on a full playthrough. Those wanting 100% completion usually had to resort to using the fists or chainsaw for good chunks of the level.
- "Hell Beneath", the first level of the new episode from Ultimate Doom, is similarly low on ammo. Even with the level's hidden rocket launcher, killing everything is difficult.
- Dual Boss: The two Barons of Hell at the end of the first episode of the original game. They get a repeat in Doom 3.
- Dummied Out: A couple of things that were supposed to happen in the original games were effectively dummied out by coding errors:
- The "Ouch Face" was an expression for the Doomguy head in the middle of the status bar that was supposed to show if the player received more than 20 damage at a time. In practice, the code was written in such a way that it would only appear if the player took damage and gained at least 20 health during the same tic, something that was extremely unlikely to occur without the player actually trying to make it happen. The "Ouch face" is fixed in many source ports (such as, Boom, ZDoom)
- The message "picked up a medikit that you REALLY need!" was supposed to appear if the player had less than 25% health when they picked the kit up. Unfortunately, the code checks the player's health after applying the health change for picking up the medkit, meaning it is physically impossible for the player to have less than 26% health; as a result, the message is never displayed at all (this is also fixed in source ports like ZDoom).
- There was also the BFG. The classic BFG is probably the most complicated and illogical weapon ever put in an FPS, largely due to it holding over all of the mechanics from a scrapped alpha version of itself. This "billion fireballs gun" fired a ragged burst of 40 projectiles and was scrapped because it "looked like Christmas" and slowed the game to a crawl. The Doom BFG might appear to just fire a big ball that does splash damage, but it actually does this:
- After a delay of just under a second, the BFG fires the green energy ball.
- On impact, the projectile deals a large amount of direct (not splash) damage to whatever it hit.
- The BFG's invisible mechanics come into play now. The weapon fires a spread of 40 hitscan "traces" (or "rays") evenly distributed across a 90-degree arc pointing in the direction the BFG ball was fired in, from the player's current position, with each ray dealing 15d8 damage. Coupled with the average damage of impact being 450 damage, the average damage of the BFG (with very little deviation, due to the 601 dice rolls) was 3150 damage. This is 150 more health than the final boss of Doom has.
- Most people are not aware that you can kill someone with the BFG with your back to them after firing it in a totally different room.
- Initially, an Easter Egg game of Asteroids was to be accessible from the computer map, but this was almost entirely cut. (Some references to deleted files remained in code.)
- Another piece of code that was dummied out was intended to allow for doors to slide sideways. This was meant to be used in Doom II's secret levels which are based on Wolfenstein 3D levels. The code was commented out when id decided to scale down the amount of Wolf 3d assets in the WAD file. Therefore the doors in the secret levels still open just like those found throughout the rest of the game (unlike the original Wolfenstein 3D doors that opened sideways).
- Since Doom and Doom 2 practically use the same executable, any Doom 2 content is technically "dummied out" in the original doom (with the original Doom mode forcefully disabling Doom II specific content in custom maps.) The lack of such protection caused problems in betas v1.5 and v1.6, where the super shotgun could be obtained by an all weapons cheat but either crashed the game or prevented you from selecting the regular shotgun.
- Earn Your Happy Ending: After destroying Mars, venturing home to Earth to find that it's been taken over, saving the entirety of the human race, then venturing to hell and BLOWING HELL UP Doomguy deserves this whole-heartedly.
- Embedded Precursor: The Limited Collector's Edition of Doom 3 and Resurrection of Evil on the original Xbox includes the original Doom and Doom II. The latter also includes the Master Levels of Doom II. The BFG Edition also includes the first two Doom games.
- Empty Room Until The Trap: This series gets off on this. You'll probably run into a seemingly empty room, maybe containing some goodies, until you fall into a trap where a horde of demons wants to destroy you.
- The End... Or Is It?: The text-crawl endings to the non-PC editions of the original all suggest that demons may have made it to Earth. The PC version makes it abundantly clear with the cutscene following the text that, yep, they did. And the Doomguy's pet bunny Daisy was their first victim.
- Enemy Rising Behind: It was possible in Doom although the enemies were generally easier to defend against, but were uncommon. In Doom 3, monster closets are more numerous, and make less noise, making them much more frustrating to some players.
- Enemy Summoner: Pain Elementals and the Icon of Sin in Doom II; Archviles in Doom 3.
- Energy Ball: Plasma Gun, BFG and some enemies (Hell Knights, mostly) fire them.
- Epic Fail: What did the UAC want to do? Make teleporters. Result? Hell invades Earth.
- However, in Doom 3, once the UAC higher ups learn about the direction Betruger is taking the project in, they send Campbell and Swann to investigate and — if necessary — pull the plug on the project.
- Equipment-Based Progression: In the classic games, the player gets stronger as they find better and powerful weapons, and finding your first ammo backpack permanently gives you double the ammo capacity. In Doom 64, your Unmaker has Artifacts that makes it a much more powerful weapon.
- Everything Fades: In the first two Doom games the bodies of enemies stick around forever. In Doom 3, demons disappear in a fizzly animation. This was probably to lighten the load on the game's engine and RAM usage by cutting down on rendered objects. Some mods do undo this and the bodies of humans and zombies generally remain, unless damaged to the point they disintegrate.
- Evil Is Not a Toy: Surprisingly averted in Doom 3. The Doctor not only makes a deal with Hell to open the gates and let their armies through so they could invade the Earth but is still rewarded when the plan fails and granted a powerful demonic body and legions of demons to serve him.
- Evil Laugh: Dr. Betruger gives several of those in a demonic manner. They range from cool to goofy to downright scary.
- Arch-viles give several of those also, when hunting you down.
- Evil Versus Evil: You can set up scenarios like this quite easily, and some demon types, such as Cacodemons and Barons of Hell, actively despise each other.
- Evolving Weapon: The Unmaker in Doom 64. When you first get it, it fires only a single laser and isn't anything special. If you manage to collect all three Demon Artifacts hidden throughout the game, though, it shoots multiple lasers in a spread pattern and is even more powerful than the BFG 9000 (to the point that only about a half-dozen shots are needed to kill the Final Boss.
- Exactly What It Says on the Tin: Betruger. This requires being German or knowing a bit of the language, mind, but it's funny in either case. Translates into something like "deceiver", "cheater" or "swindler.
- Excuse Plot: Demons have invaded Phobos/Earth/Mars! Go kill them all in an over the top and gory fashion.
- Expansion Pack: Final Doom contained two of them in one stand-alone game.
- Ultimate Doom was a re-release of Doom featuring an additional episode.
- Resurrection of Evil is a straight, simple expansion pack for Doom 3 on PC. The Xbox version, however, was a standalone game due to being a console release.
- Exploding Barrels: Doom II has a level full of them — Barrels O' Fun — a classic example.
- Doom 3 has a variant on these with the yellow toxic barrels. Once you shoot them, they simmer for a couple seconds before exploding (though they will explode automatically if caught in the splash of another explosive).
- Face-Heel Turn: Sergeant Kelly though whether it was before the game began or at some point during it is not made clear.
- Dr. Malcolm Betruger could be a another example too. In a log, it's said he once had been a normal human being but after he went into the portal to Hell and came back, he "changed".
- Fake Difficulty: A lot of the difficulty in Doom 3 comes from the fact that it's very dark, and the flashlight is the only way to see what you're doing. You cannot use the flashlight and a weapon at the same time. The "Duct Tape" mod and BFG Edition drops the difficulty by an order of magnitude merely by letting you tape the flashlight to your smaller guns and mounted on your shoulder, respectively; it turns out it's a lot easier to play a game when you're allowed to see where and what you're shooting.
- The SNES port removed the ability to circle-strafe, making bigger enemies much harder to quickly defeat.
- Fan Remake: Doom 64 EX, a successor to the Doom 64: Absolution total conversion, is a fan-made recreation of the Nintendo 64 game for PC with new added features.
- The PlayStation version of Doom has a total conversion on PC (requiring GZDoom) with some enhancements and side mods to recreate the feel of the original game.
- Fate Worse Than Death: What happens to the souls that power the Artifact? It is Hell's weapon after all, so odds are that it isn't pleasant.
- Fire and Brimstone Hell: When you do see it. Doom 3's Hell is this, mixed with pulsating flesh and rivers of blood.
- In the original game Hell was mainly made of flesh, marble, wood, and stone, with the occasional river of blood and the wall of skinned faces. There are, however, exceptions, such as Mt. Erebus, which featured a charred mountain and floors of glowing, ashen rock streaked with lava.
- Fireballs: They're most notably fired by Imps.
- First-Person Shooter: It's the Genre Popularizer. They were known as "Doom clones" for several years before the name "first person shooter" became common.
- Flying Face: Lost Souls, Pain Elementals, and Cacodemons.
- Foreboding Architecture: Dark areas and/or textures tend to contain Spectre demons.
- If you see random spider webs and cocooned people lying around, chances are you're about to stumble on some Trites.
- Frickin' Laser Beams: The Unmaker shoots a power laser that pierces through demonic enemies.
- Game-Breaking Bug: The PlayStation version has a TEXTURE CACHE OVERFLOW bug that crashes the game due to overloading the system's memory (especially on first-generation PlayStations) when a very large number of enemies are present.
- Another PS1 bug that broke the game for anyone attempting to finish a level with 100% kills would sometimes occur if a monster was impacted by splash damage or was simply shot at when too close to a wall. The monster (this tended to happen most with the Lost Soul floating skull or any of the zombie soldiers) could be sent into the wall. The monster would still be visible and still in fact attempt to shoot or attack the player, but would otherwise be unkillable (and unable to harm the player). Adding to the surreal nature of the bug, the monsters would then start moving off into the distance until they effectively vanished from view (but could still be seen using the show monsters map cheat). This glitch appears to be unique to Doom proper and not the PS1-exclusive Final Doom sequel.
- Game Mod:
- Lots of IWAD's and total conversions for the original Doom games are still being produced, even after almost twenty years after the release of the first game.
- Common mods for Doom 3 include some of the following:
- "Duct Tape Mod," in response to not being able to use a gun and your flashlight at the same time.
- "Perfected Doom 3", adding new graphics, more excitement and a shoulder mounted flashlight.
- "Last Man Standing Coop", allowing the player to play the whole game coop, with new game modes and gameplay fixes.
- For the original games, there are way too many mods to mention them all.
- Many of the mods for the classic games can be found at the /idgames archive or at the numerous message boards which are still fairly active. Another alternative would be to use a modern server browser, that comes with an auto-downloader.
- Ghouls Vs Humans is a mod that allows you to fight with all kinds of classes and scare the hell out of you.
- ZDoom Wars is a first person Real-Time Strategy that allows you to fight with all kinds of armies from different games.
- Modder "Scuba Steve"'s Action Doom mods: The original is an homage to arcade action games like Contra and Metal Slug, complete with you being a One-Hit-Point Wonder, while Action Doom 2: Urban Brawl is a Beat 'em Up like Double Dragon done in a first-person perspective.
- Batman Doom: Besides sounding awesome, it was a great technical breakthrough in the early Doom days.
- Some mods actually make it to the mainstream media because of the Rule of Fun:
- A mod made at the height of the 2010 World Cup, gives the Doomguy a most fearsome weapon: a vuvuzela. The expression on his face is what sells it.
- It's not the first of its kind. One previous mod added in a stereo. Sounds pathetic? Well, not even demons can withstand a Rick Roll, apparently.
- True Capitalist Doom (Based off of True Capitalist Radio) replaces the protagonist with Ghost, shotguns with "crushing cans", the BFG with a Hadoken, The CyberDemon to play the "FU Texas" song, and so forth. Ghost himself said he liked the mod.
- Aeons of Death adds literally hundreds of new monsters, weapons, items and even character classes from many other famous first-person shooters, including Quake, Heretic, Hexen, and even Half-Life!
- Version 6 also adds six of the player classes from Team Fortress 2, the Postal Dude, of all people, and even the Infected were brought into the fray, along with a Portal Run mode, and Monster Mayhem, which has you dealing with enemies spawning in every-so-often in addition to those already in the maps.
- Brutal Doom is Exactly What It Says on the Tin — your weapons have all received a power upgrade (and your wimpy peashooter has been replaced with an assault rifle that can fire on full automatic and is capable of scoring headshots on enemies), the action is much Bloodier and Gorier than the original game with many enemies now capable of being smeared all over the vicinity, the Berserk Pack now gives you the option of doing Fatalities on enemies, and your enemies have received an upgrade as well and are fully capable of ripping you to shreds, making gameplay a lot tougher than the original.
- Samsara is an Ultimate Showdown of Ultimate Destiny mod that allows you to play as Doomguy himself, Chex Warrior, Corvus, B.J. Blazkowicz, Parias, Security Officer and Ranger.
- REELism is a not-at-all-serious score-centric round-based survival mod in which an RNG slot machine activates at the beginning of each round to change up the game, altering special effects (such as flight, exploding enemies, or other gameplay-related stuff), weapon spawns (or lack thereof) and enemy types. Things tend to get very frantic, and that's before the boss that appears in the sixth round; as a time-waster that can be played in short bursts, it's a lot of fun.
- Gameplay and Story Segregation: The Mother Demon in Doom 64 has the power to resurrect fallen demons, making them stronger than before. You fight it at the end of the game after wiping out a small army of demons, and it never tries to revive any of them.
- Gatling Good: The Chaingun. It's been a series staple and can mow down most enemies in seconds. The only time it becomes ineffective is against bosses (except for Vagary and Sabaoth AKA the mutated Sergeant Kelly in Doom 3).
- Giant Mook: Revenant, Mancubus, Hell Nobles, Arch Vile, and in Doom 3: Resurrection of Evil, Bruiser.
- Glass Cannon: Lost Souls, which die quickly for high-level enemies but can quickly eat away a good 20% or so health if they land a hit.
- Cherubs do an incredible amount of damage for their size. Also Pinkies, that are pretty weak and don't do much damage per hit, but attack nonstop, and fast, if close enough. Combined with the Interface Screw, they can bite away with impunity.
- In Doom II, the Chaingunners and Revenants are this, the former only having marginally more health than former humans, but able to really put the hurt on you and even other monsters, while Revenants have relatively little health (2 Super Shotgun blasts will kill one) but shoot homing rockets at you, and pummel you to pulp up close.
- Guide Dang It: Some of the secret areas can reach this level. The Containment Area in Episode 2, for example, not only has a secret room within a secret room, but there's a secret passage within that secret room leading to another part of the stage, and there's another secret room within that secret passage.
- Guilt-Based Gaming: When the player attempts to exit, a humorous quit message is shown, mockingly trying to convince the player to stay and play some more.
- Harder Than Hard: The aptly-named "Nightmare!" difficulty, the only setting where monsters you've killed will respawn several seconds after they die. The monsters also shoot more rapidly than on all the other difficulty levels. And cheat codes are disabled. The only good thing about it is that ammo pickups contain double the normal levels of ammo... and you will need it all.
- "Nightmare!" difficulty wasn't even included in the earliest releases of the game. It's very hard in single player mode, but it's fine for co-op multiplayer games, which let the players respawn, too.
- Heart Container: Health and armor bonuses respectively can raise your health and armor past 100 though you cap at 200. Soulspheres gives you an extra 100 health and Mega Armors gives you 200 armor instantly.
- Heroic Mime: The Doomguy (with the exception of the Comic) doesn't seem to have a whole lot to say. This may be because there is nobody to talk to.
- But he can express himself with the great communicator.
- In Doom II, he talks to several people through comlinks, albeit offscreen.
- Heroic Sacrifice: Presumably the marine and Dr. McNeil in Resurrection of Evil.
- Hero-Tracking Failure: Enemies tend to miss their shots when the player is circle-strafing around them, unless the enemies are able to surround the player.
- Highly Conspicuous Uniform: The Marines wear sensible fatigues, but their body armor comes in Day-Glo Lime Green and Peacock Blue.
- Hit Scan: All bullet-based weapons and the invisible part of the BFG's fire cycle in the first two games.
- In some cases (particularly Nightmare difficulty) this can make zombie marines even worse than their tougher imp counterparts. At least with imps you get a chance to dodge the projectiles that get shot at you.
- Holodeck Malfunction: The premise of the "Cleimos" WAD.
- Homage: Doom II also had two secret levels lifted almost directly from Wolfenstein 3D, the second of which ended with an appearance by a quartet of (soon-to-be) dead Commander Keens.
- Ret Canon: The Doomguy in the cellphone-only Doom RPG series is related to B.J.
- Hyperspace Arsenal: Where the hell is the Doomguy keeping all of those weapons? Not to mention the ammo; at the start of the game the player can hold 50 full-sized rockets, in addition to other ammunition and weapons. When you later find a backpack, you double your ammo carrying capacity. A hundred explosive warheads are rather impossible to fit inside a military grade backpack, and that is not accounting for your twenty kilos of bullets and five full boxes of buckshot.
- Hyperspace Is a Scary Place: Teleporting in Doom 3 will result in you seeing a terrifying blood-tunnel filled with screams. And occasionally Hell.
- Idiosyncratic Difficulty Levels
- In the original games:
- In Doom 64 (all difficulty levels correspond to the number of enemies):
- Be Gentle!
- Bring It On!
- I Own Doom!
- Watch Me Die!
- In Doom 3:
- Recruit: damage taken reduced to 60%, less enemies;
- Marine: normal damage taken, normal enemy rate;
- Veteran: damage taken increased to 170%; slightly higher enemy rate;
- Nightmare: damage taken increased to three hundred percent, more enemies, and your health constantly decreases to 25 points no matter what. Know that shiny Soul Cube you got at the start of the game? You will need it.
- Idiosyncratic Wipes: The classic screen melt effect in every transition from the original. Some sourceports add some extra wipes.
- Incendiary Exponent: The Lost Soul. According to the Doom II manual: "Dumb. Tough. Flies. On fire. 'Nuff said."
- Indecisive Medium: The film adaptation has a suspicious amount of scenes shot in "first person".
- Infinite Flashlight: The only upside of the torch in Doom 3 is that it'll never run out of juice.
- Insurmountable Waist High Fence: Central to much of the level design of the first two games, which did not feature any kind of jumping. Later source ports added jumping, allowing players to skip huge swaths of the classic levels by simply hopping over these obstacles.
- Taken to the extreme in Ballistyx from TNT: Evilution — the exit linedef is on a chest-height altar that's supposed to be lowered into the ground near the end of the level, meaning you can finish a normally six minute or so map in under two seconds by simply jumping up onto it. Dead Simple in Doom II likewise has the exit switch on a waist-high platform, allowing you to finish it in three seconds just by jumping.
- Interquel: The Ultimate Doom, which was published after Doom II, contained a fourth episode for the original Doom, which occurred before the events of Doom II.
- In the Style of...: Bobby Prince's music for the game is based on heavy metal — John Romero lent Prince a set of metal CDs for reference, and thus the soundtrack is filled with Suspiciously Similar Songs.
- Jump Physics: You can't jump, but you can fall fifty feet without getting hurt.
- Jump Scare: The third game places ample amounts of these in each level, so much that about 20 minutes into the game, you would already became wiser to stay on your guards whenever entering a seemingly empty hallway/room.
- Kaizo Trap: Halls of the Damned has a fake exit switch that instead dumps you into a room with a Cacodemon and a ton of Marines.
- King Mook: The Spider Mastermind to the Arachnotrons in the original games. Vagary to the Trites in Doom 3; a Queen Mook, if you will.
- Kubrick Stare: In Parts 1 & 2, as Doomguy takes more damage, his head dips lower and lower, producing this effect.
- Large Ham: Betruger. So very much. He starts off overacting, and gets more and more over the top and Narm-tastic as the game goes on - apparently Hell turns you into the offspring of William Shatner. He's SUPPOSED to be scary, and does have a few cool evil laughs, but it's mostly I'LL SWALLOW YOUR SOUL type stuff he yells at you from the great beyond.
- Laughably Evil: The demons in Doom 3 are, in an easter egg, this, believe it or not. In a hidden PDA, the demons try to instruct their fellows in how to invade:
"Virgin blood is best."
"Goat blood must be no older than 3 days."
"Entrails must be removed and apportioned either before death, or no later than 30 min."
"Candles must be sorted by tallest in back to shortest in front - never the other way around!"
"Most important - pentagrams must be drawn from the center to the outside and left to right."
- The Legions of Hell: Your opponents.
- Level-Map Display: You can always look at a map of what you've explored so far. If you find a computer map, you can see the entire level.
- Except in E1M8. Here the computer map is given to you right from the beginning. The level is named "Phobos Anomaly", but the map does not show the anomaly itself...
- Life Drain: A variant with the Soul Cube. When it's flung, it kills the demon and transfers all of its remaining life energy to you. Goes well with the lack of medkits late in the game.
- Like a Badass out of Hell: Literally. In the first game, he goes from Phobos, to Deimos, to Hell, and then back. In the sequel, he more or less destroys hell. And in Doom 64, he finally decides to stay in Hell to make sure the demons don't try to invade Earth ever again.
- Limited Special Collector's Ultimate Edition: The Limited Collector's Edition of Doom 3 on the Xbox includes the two previous games. It also added a second secret level to the first episode in Ultimate Doom and another secret level in Doom II. It also includes an slideshow of Doom 3's concept art, an episode of G4's Icons on id Software, and interviews with the developers.
- Literary Allusion Title: The name Doom was chosen as a Shout-Out to Tom Cruise's pool cue in The Color of Money.
- Living Structure Monster: Icon of Sin, a wall with a picture of a demon on it, the Final Boss in Doom 2, attacks you by summoning his various demonic flunkies to fight you. His weakpoint is on a point on his "head".
- Logic Bomb: In early versions of the classic games, monsters can fight each other if they hit each other. But if they somehow hit themselves (typically via barrels, as detailed in this article), they will tear themselves apart.
- Lowered Monster Difficulty:
- In the backstory, the Redshirt Army with its heavy weapons is completely useless, yet your character can kill lower-level enemies with the pistol or shotgun... But notice how you only start finding heavier weapons in later levels. They're retrieved from your former buddies who managed to survive long enough to get deeper into the bases.
- Doom II introduced Hell Knights, which are a Palette Swap of the Baron of Hell from Doom. They do just as much damage, but have significantly less health. The downside? They appear in numbers larger than Barons would have.
- Inverted in The Lost Mission, where the first enemies you face have noticeably less health than normal. Given that the campaign drops you straight into the action against mid-level demons while armed with nothing but a pistol, it's explained by game design.
- Ludicrous Gibs: Dealing enough damage will make certain monsters burst into red splatters.
- The Soul Cube tends to do this to monsters.
- Mad Scientist: Dr. Malcolm Betruger, to literally diabolic levels.
- Magikarp Power: The Unmaker in Doom 64 goes through this. When you first pick it up, it only fires a single laser at a slow rate. Finding the first Artifact makes it shoot faster, the second gives it a Spread Shot effect, and the third further ups the effect, effectively reaching beam spamming levels.
- Marathon Level: Going by the "par time" at the end of the levels, E2M4 and M6 are 6 and 4 minutes respectively, while it usually never goes to 3 minutes, and Doom II has 7 minutes in Maps 17 and 28. Most maps on Episode 3: Inferno are really long and convoluted as well.
- Meaningful Name: The name of Dr. Betruger in Doom 3 means something along the lines of "scammer" in German. They probably intended it to be more like "traitor", but that would be "Verräter."
- The third episode of Doom (Inferno!) draws its name and its episode names from The Divine Comedy. The fourth episode (Thy Flesh Consumed), and its levels except the secret level (Fear), draw their names from Bible quotations.
- Meat Moss: In Doom 3, some areas are covered with, for lack of a better word, flesh masses that look like turds. If you shoot them, they sound like steel.
- And of course, the original Doom series had plenty of fleshy walls and floors once you started descending into Hell.
- Medieval Stasis / Schizo Tech: A very strange example in Doom 3. It's 2145, humanity has an established base on Mars, has mastered plasma technology, and is foraying into the science behind atomic structure (the MFS Compactor comes to mind) and teleportation... yet:
- The most commonly found storage medium is a square-foot disk with capacity for only a few minutes of video and/or audio.
- Security forces lack any kind of enhanced vision, being forced to rely on hand-held flashlightsnote (armor-mounted in BFG Edition) with very bad quality reflectors full of artifacts and dark spots.
- All projectile-based weapons seem to use black powder given just how much smoke they produce per shot.
- All UAC workers must use a standard issue PDA that is clunkier and less versatile than most of the cheapest tablets you can find in 2012.
- Mega Corp.: Union Aerospace Corporation, and in Doom 3, Martian Buddy. Interestingly, despite the mention that the UAC can operate outside of legal and moral obligations, the common "corrupt" aspect of this trope is pretty much averted through Doom 3. The trouble was caused by a lone Mad Scientist who was often at ends with the Corporation's board of directors, who are smart enough to realize that uncontrollable demons running loose are not a good source of revenue, unlike a certain other corporation.
- Mission Pack Sequel: Doom II to its forerunner. Same engine, only a single new weapon (the double-barreled "Super Shotgun"), and a handful of new enemy types (one of which is just a slightly weaker palette swap so it can be spawned more often than its stronger brother). However, Tropes Are Not Bad because Doom was a great game and a slew of new maps is not unwelcome. That being said, some of the level design choices in the back half of Doom II don't exactly hold up as well as you'd hope...
- In turn, Final Doom is this to Doom II — both were originally full 32-map mods for Doom II before they were picked up to be published by id.
- Monster Closet: The Trope Codifier, along with Teleporting Keycard Squad. Often times rooms would be just a pedestal with an item on them, but taking the item opens up all the walls to reveal nasties. If you see a key or very good item, expect the baddies to pop out as soon as you get it.
- They did it with Doom 3, where it stretched believability to the breaking point. "They're breaking through the walls!" (radio transmission)
- Mook Maker: the final boss of Doom II spews out various enemies, which can telefrag you if you're not careful. And then there's the Pain Elementals, who chuck Lost Souls at you.
- The Archviles in Doom 3 are this too, not limited by the number of corpses. Mostly because of Everything Fades.
- Moral Guardians: Along with Grand Theft Auto and Carmageddon, this was one of the go-to scapegoats for grandstanding politicians for nearly a decade.
- The fact that Columbine shooter Eric Harris was revealed to play it certainly didn't help matters (not only that, but he made a Doom WAD of his own called UAC Labs, which made it onto DoomWorld's Top 10 Infamous WADs list).
- Multi-Mook Melee: Many of the custom "slaughter maps" and Nintendo Hard megawads are mostly made up of these, with some fights in the infamous Deus Vult map (maps 1-4 are parts of the main map, which is map05) or the ever fun "Go 2 It", which involves a brawl against several Arachnotrons and Cyberdemons. The infamous nuts.wad has so many enemies note that on badly coded ports framerate slows down to a crawl, even if using a computer made 20 years after the original game. However, serious maps with that many monsters have also been made.
- My Brain Is Big: The Spider Mastermind and the Arachnotrons.
- Names to Run Away From Really Fast: "Betruger" means "swindler" in German, with the added bonus of sounding like the word "betrayer." Guess what he does to you.
- Nintendo Hard:
- The first several levels of Doom II are fairly standard difficulty, but things get really insane once you hit "Dead Simple" and "Tricks and Traps".
- The Plutonia Experiment, although it pales greatly in comparison to the freely-available Hell Revealed and Hell Revealed 2. Oh, and the entire game on Nightmare difficulty.
- Not to mention Alien Vendetta, Deus Vult 1 and 2, and the ZDoom version of NeoDoom. The stupid vixens with their ridiculously-high 10000 hit points (and especially the Mega Vixen with her even-more-insanely-overblown 25,000 hit points.) alone sent the difficulty curve skyrocketing through the roof in the later levels in case all the other overpowered custom monsters didn't already do that.
- For an idea of how much HP that actually is for those enemies, Cyberdemons only have 4,000. (and spider mastermind only having 3,000. This IS low enough for a point blank BFG-9000 blast to kill it in one shot, BTW.)
- No Fair Cheating: Using "-turbo" prints a chat message from time to time. In the original, and most ports of it, cheat codes are disabled entirely in Nightmare difficulty.
- No OSHA Compliance: Toxic ooze is easily accessible throughout many levels, though some of it is explained in-game by information suggesting this was due to neglect and the happenings of Dr. Betruger.
- The strategy guide for Doom II practically calls this trope out by name: (in regard to the Radiation Suit) "OSHA may not like it, but to get the job done, you're going to have to handle some toxic waste every now and then."
- An in-game audio log in Doom 3 features an "accident" report of a worker who, in a trance, stepped back into a particle beam that removed the back of his head. The new "safety" measures that the log author mentions implementing involve a locked cabinet. They do not involve barricading off the particle beam so that no one can accidentally wander into it.
- Novelization: Four books based off Doom and Doom II (with the first two being actual novelisations of the game's storyline, such as it was). And two more based off Doom 3.
- Nuclear Candle: The actual effect of the Light Amplification Visor is to brighten the whole map to max level.
- Number of the Beast: One of the release versions of Doom and Doom II is v1.666.
- The first map of Knee-Deep In The Dead has 666 linedefs in The Ultimate Doom.
- Obviously Evil: Malcolm Betruger. If his generally sinister attitude, name, and whited out eye aren't tipoffs, then it's difficult to say what is.
- Oculothorax: Pain Elemental and Cacodemon.
- Oddball in the Series: The two Doom RPG games for being RPGs in a shooter series.
- Doom 3 also counts for using a completely different engine, being the only truly 3D installment in the series (not counting spinoffs.) In addition, its slowed-down gameplay and increased horror elements separate it from every game besides Doom 64, another oddball for using these elements too (though it uses the Doom engine.)
- One-Hit Kill: All NPCs in Doom 3 will die in one hit. Even a punch into an unscathed NPC's toe.
- Only Six Faces: Doom 3 only has a handful of faces for the various human NPCs, which are re-used frequently. This is most noticeable in the opening Scenic Tour Level, where you can find two guys with the exact same head standing in the same room.
- One-Man Army: This may be the current benchmark. Did we mention that he BLOWS UP HELL BY HIMSELF?!
- One-Winged Angel: By the end of Doom 3, Betruger is transformed into a demonic dragon. In Resurrection of Evil, he puts up a hell of a fight with his new powers.
- The Only One: You play the lone space marine who was left on guard duty at the ship, now the only thing standing against the hordes of hell.
- Overdrawn at the Blood Bank: Doom was one of the few video games in the early 90s that demonstrates that 2D sprites can spill lots of blood shot and killed, and some enemies can be gibbed when killed by high-powered weapons.
- Password Save: In the PlayStation and Saturn versions of Doom and in Doom 64, although Doom 64 also supports a save function whereas the PlayStation and Saturn versions does not.
- Painfully Slow Projectile: Most monsters' projectile attacks move pretty slowly. Unless you're playing on Nightmare difficulty.
- In Resurrection of Evil you're able to use the Grabber to snatch an enemy's fireball out of the air and hurl it back at it.
- The BFG-9000, no matter the incarnation. In Doom 3, they travel so slow that you can literally shoot them out of the air before they hit you! This is, in fact, how you're supposed to defeat Sabaoth.
- Not just limited to the monsters, Doomguy's Plasma Gun in Doom 3 has this defect. Supposedly it balances out how the Plasma Gun has a zero-degree spread when sustaining fire, but it makes the Plasma Gun horribly inefficient when fighting enemies like Lost Souls, Cacodaemons, and to a lesser extent Cherubs.
- Path of Greatest Resistance: If a room is filled with bodies, you've already been there.
- Phlegmings: The Hell Knights from Doom 3 have this when they roar.
- Physical Hell: Doom's entire plot revolves around the idea that teleportation experiments on Mars resulted in portals to Hell itself, cue The Marine. Also, the Martians in Doom 3 already did the same thing by accident long ago, sacrificed most of their civilisation to fix it, and fled to Earth.
- Plagiarism: The Cacodemon is the head of the Astral Dreadnought monster taken from the cover of the Dungeons & Dragons supplement Manual of the Planes.
- Psychotic Smirk: The marine is rather passionate about battling Hell's hordes as, after a new weapon is picked up, the protagonist grins devilishly at prospect of blowing away demonic forces with it.
- The best part is when he makes the grin while his face is covered in blood.
- Punny Name: Several songs on the soundtrack, including but not limited to Kitchen Ace (And Taking Names) and Nobody Told Me About Id.
- Bye Bye American Pie was both a play on the song name "American Pie" and one of the level designers of Doom II, American McGee.
- Quad Damage: The Berserk Pack multiplies fist damage by ten times. For the rest of the level. You can gib weak mooks by punching them.
- There's a (hopefully) intentionally crappy mod out there called All Hell is Breaking Loose! Among such things as flying demons that shout "Fuck you!" and flip you off when they die, the zombie soldier gib animation is replaced with them burning to death. This means that you can set someone on fire with a punch.
- Also the second power of the Artifact from ROE is a berserk charge that lets you one-shot any enemy in the game (except bosses) with your fists. Considering the FIRST power is Bullet Time and the THIRD power is invincibility it's obvious why the Artifact is a major league Game Breaker.
- Rated M for Manly: Admit it, you've always wanted to kill demons with your bare hands. The sequel takes it Up to Eleven when you blow up Hell.
- Reassigned to Antarctica: The Doomguy in the original two games assaulted a superior officer who ordered him to fire on civilians. Rather than a court martial that would make them look like monsters if the reason for it got out, they decided to assign him to Mars — a barren rock whose only notable features were scientific outposts on its moons, and which was never expected to see any sort of action.
- Red Eyes, Take Warning: The Spider Mastermind (AKA Spiderdemon).
- Red Sky, Take Warning: Hell.
- In Doom 64, not only is Hell's sky red, but in some levels it's on fire.
- Reformulated Game: Doom 64. The redone levels and enemies, darker graphics and horror-inspired soundtrack gave the game a much different ambiance than the original game, even if the gameplay is for the most part still the same.
- Regenerating Health: Inverted in Doom 3's Nightmare difficulty, where your health constantly decreases by five points every five seconds until it hits 25.
- Ridiculous Future Sequelisation: A PDA message in Doom 3 says "The new Quake-43 game blows my mind."
- Right-Handed Left-Handed Guns: Completely averted in the original Doom games, where the Doomguy is very notably shown to be left handed; both in the way he holds his guns, and when he's using his fists.
- Road Runner PC: The Doom marine was intentionally faster than normal monster movement, and could be made faster with a command line option. What wasn't intentional was strafe-running (+40% speed boost), and wall hugging (massive speed boost).
- Rocket Jump: Ur Example in first-person shooters. There's no vertical lift, but it does toss you around. One secret was specifically designed to require a rocketjump... though it can be reached just by straferunning.
- The Scapegoat: For Columbine and other school shootings.
- Scenic Tour Level: In Doom 3. Unlike most examples, they give you a gun and even allow you to murder your co-workers even before things go to hell.
- Schizophrenic Difficulty: Episode 4 of Ultimate Doom suffers from this. The level progression goes like this: starts out really hard -> ungodly difficult -> not as hard -> pretty easy -> about medium -> really difficult again -> somewhat easy -> ends on a rather medium difficulty level.
- Schmuck Bait: In Doom 3 BFG Edition's Lost Mission, there's a room where a revenant blasts out the windows, forcing you to run through a few Imps to hit a button and close the emergency shutters. Unlike the control panels in most other similar situations, this one stays functional after you've fixed the problem. No prizes for guessing what happens if you hit it again...
- Sequence Breaking: Straferunning and Arch-Vile jumps are just a few examples of sequence-breaking tricks.
- Memorizing some of the security codes in Doom 3 and Resurrection of Evil can do anything from unlocking powerful weapons early to circumventing an entire PDA hunt.
- Sequel Difficulty Spike:
- The first several levels of Doom II are pretty standard difficulty. Things really ratchet up once you hit "Dead Simple" and "Tricks and Traps", with large groups of high-tier enemies appear very frequently.
- Final Doom (The Plutonia Experiment and TNT: Evilution) takes Doom II and ratchets it Up to Eleven.
- Like many expansion packs, Resurrection of Evil is noticeably more difficulty than the original Doom 3, with large groups of high-level demons regularly appearing to attack you, and the introduction of an insanely powerful Giant Mook (the Bruiser) who's equipped with dual full-auto rocket launchers that can gib you in seconds. This is balanced out by the new Artifact, which grants you superpowers for a limited period of time.
- Set a Mook to Kill a Mook: A vital survival technique, especially in levels with more monsters than you can shake a boomstick at. If an enemy damages another enemy, they will engage each other.
- The first area of E3M1 didn't have enough ammunition to kill all the Beef Gates. It was punch them to death, or get them fighting each other. Since Imps and Cacodemons both had ranged attacks, getting them to hit each other was relatively easy. Then the retaliation started...
- E2M9, the secret level in the second episode, had two rooms. One with Barons of Hell, the other with Cacodemons. Again, the trick was to get them fighting each other, then maneuver for survival. (Lampshaded in the novels.)
- Map 8 of Doom II has a room with a Cyberdemon and several Barons of Hell facing away from you. The trick? Cause infighting to dispose of one group, then take down what's left. No wonder it's called Tricks And Traps.
- Map 20 of Doom II contained a large antechamber with a Cyberdemon and a Spider Mastermind on two opposite platforms. No prizes for guessing the easiest way to waste them both. The level is appropriately named 'Gotcha!'
- This sequence exists mostly to try and answer the Ultimate Showdown of Ultimate Destiny-style question of who would win. (It's usually the Cyberdemon, but the Spider Mastermind's odds improve in inverse proportion to the distance between them. Gotcha! is just on the Cyberdemon's side, although Spidey does sometimes win. In some rare cases, they can end up killing each other.)
- Lost Souls behave differently with in-fighting. They will make at most one attack when damaged (but can still exchange blows), and resume attacks on the player.
- Shareware: One of the most well known examples, Doom is probably the one title above all others which destroyed forever the "shareware is shareware because it's nowhere near good enough to sell at retail" myth. It was the first shareware product ever to be reviewed in the main pages of British PC Format magazine, instead of being relegated to the shareware section.
- Doom II did not receive a shareware release, on the other hand. This was because, according to John Carmack, many people who downloaded the shareware episode Doom and beat it mistakenly considered themselves to have "beaten Doom" when they beat the demo.
- Also because shareware was essentially a distribution method: download the (longer than average) demo, and if you like it, mail order the full version. Doom II was conceived as a retail product from the start, so all of that was unnecessary. And then Id decided to rerelease Doom at retail, as well...
- Carmack has said in a 20th-anniversary interview that shareware was actually not such a great fit for Doom. Not because any problem with the strategy itself, but because the game was such an obvious generational leap forward in game technology at the time, it literally sold itself, without need of any marketing gimmicks.
- Shoot the Medic First: The Archvile in Doom II can revive fallen foes, so killing this guy first is essential. However, he can also deal out a ton of damage with his line-of-sight attack. In ZDoom, it is possible to create enemies that can resurrect fallen foes via Decorate. Again, death for these guys should be top priority.
- Shoot the Shaggy Dog: The original screws you over twice:
- First, after defeating the Barons of Hell in the final level of the first episode, the only way out is through the teleporter... which takes you to the lost Deimos base, where you're immediately overwhelmed by monsters and die (the coding in that room ends the level once you reach 11 HP or lower). Specifically, you die and go to Hell, but since Deimos was mysteriously teleported to Hell, nothing really happens. The debriefing text really drives it home: "Once you beat the big badasses and clean out the moon base, you're supposed to win, aren't you? Aren't you? Where's your fat reward and ticket home? What the Hell is this? It's not supposed to end this way!"
- And of course, the end of episode three. The Space Marine escapes from Hell and returns to Earth... only to find that the demons he had been fighting have already invaded. Cue the the sequel.
- Short-Range Shotgun: While the original pump-action shotgun was somewhat realistic, the double-barreled shotgun from Doom II was probably the Trope Maker, as it hit with the force of a bazooka but was was hopelessly inaccurate at further than arm's reach. Doom 3's only shotgun followed suit. Of course, considering how 2/3rds of the game are basically corridors, you'll spend a good amount of time within 2 meters of your enemy, which is why this gun is still the most practical gun to use in the game.
- Shout-Out: As mentioned in Homage above, the Wolfenstein 3D levels in Doom II. One of them even have dead Commander Keens hanging in the ceiling.
- On the source port side, ZDoom has the developer's console cheat "anubis". Typing it in and pressing enter results in every monster in the game fleeing at the sight of you. Why? Because the message displayed when you hit enter is QUAKE WITH FEAR. Typing "anubis" again and hitting enter deactivates the fear effect with the message "No more Ogre Armor".
- Also, the ancient Martian panel showing off the last Martian using the Soul Cube is actually a recreation of the cover art above. Parts of the mural are broken off (notably heads), though.
- In the film, Dwayne Johnson actually had to fight to keep the "BFG" reference. There's also Pinky (who gets chainsawed), a Hellknight, and Reaper saying "Hell on Earth".
- Doom 3 had Nabcom retro arcade consoles scattered about the early levels. This included one console you could actually play, Turbo Turkey Puncher, a Game Within a Game based on graphics from the original Doom games.
- Doom II has this:
- Episode 4 of Ultimate Doom and all the levels within, excluding the secret one, have names based on biblical verses.
- Doom II was released the same year Kurt Cobain killed himself with a shotgun. MAP21: Nirvana has a shotgun in the very first sector.
- Doom 3 will compliment the user on their memory if you open the console and type in a classic Doom cheat code.
- E4M1 of Ultimate Doom has the Nine Inch Nails logo inscribed in a secret area.
- Sighted Guns Are Low Tech: How exactly would one aim any of the guns in the third game in Real Life?
- None of the weapons in classic Doom except the pistol and the shotguns have sights, eithernote .
- Slave Mooks: The zombies in all of the games.
- Smoldering Shoes: The Cyberdemon's death animation in the original series.
- A Space Marine Is You: Possibly the Ur Example, although most of the cliches are only found in the backstory from the game manual.
- Speedrun: These games developed one of the earliest online speedrunning fanbases.
- Splash Damage: The always venerable rocket launcher, along with the classic Exploding Barrels. BFG, the biggest gun in the game, does not deal blast damage in the traditional sense, though; it instead fires a cone of invisible beams (from the player, not the projectile) when the main projectile hits anything.
- Spider Tank: The Spider Mastermind(s) and the Arachnotrons.
- Standard FPS Guns: Fists, Chainsaw, Pistol, Shotgun, Chaingun, Rocket Launcher, Plasma Rifle, BFG. Doom was very important in creating/popularizing this one.
- Stock Sound Effects: Pretty much everything, from the monster roars to the launch sound of the monster spawn cubes in MAP30 (all three of the officially-published Maps 30), thanks to id licensing sound FX from the Sound Ideas library. This is why all, or nearly all, of the FX used in Doom sound familiar to movie buffs; they've been used in many movies and TV shows, both before Doom and since. In fact, one of the stock sounds is known today as Doom Doors.
- The Stoic: The marine from Doom 3. Never shows any form of emotion on his face, even fear, just frowns when new sorts of monsters appear. The only time he shows fear is when he meets the Cyberdemon.
- Strange Secret Entrance: Some of hidden levels in the series are like this. For example, getting to one secret level required you to blow yourself off a ledge by firing your rocket launcher into a wall at point blank range.
- Stupid Evil: Dr. Malcolm Betruger, who apparently has no actual motive for attempting to transform Earth into Hell and its people into screaming demon-fodder. It is implied, however, that he has been possessed or is in some way controlled by the demons. The novels indicate he was an ordinary scientist who was subject to More Than Mind Control, alternatively The Lost Mission campaign indicates he always had an obsession with the occult and was offered ultimate power by the demons in exchange for Earth.
- Summon Bigger Fish: See Set a Mook to Kill a Mook above. If you can get powerful monsters to fight each other or mow down cannon fodder, you can save yourself a lot of trouble.
- Supernatural Goldeyes: Picking up invincibility (or turning on God Mode) turns the Doomguy's eyes gold.
- Super Title 64 Advance: Doom 64. It was originally supposed to be called The Absolution, but got its name changed to follow along with the naming convention of other 64 titles. Unfortunately, this led to people mistaking it for yet another port of the original game, when in fact it is a unique game.
- The PlayStation port of Doom has the subtitle "Custom PlayStation Edition".
- Surprisingly Sudden Death: The first time you see a Lost Soul in Doom 3, it rips itself away from within a female scientist's head.
- Symbol Swearing: Doomguy's reaction upon finding the Unmaker in Doom 64: "What the !@#%* is this!"
- Tank Controls: The default setting for the PlayStation and Saturn versions of Doom and Doom 64. You can change the controls in the PlayStation and Saturn versions although the customization is not as extensive as Doom 64.
- Tele-Frag: Just like "frag", it was also first coined in Doom multiplayer matches. Some Doom levels allow you to telefrag monsters (e.g., E4M2 in Ultimate Doom). Doom II's final boss can also telefrag you if its monster-spawning projectile makes its impact right where you're standing. note
- If you're playing Doom 3's co-op mod, telefrags are possible (yes, STILL) at the beginning of the level if your teammate spawns on top of you. Seen here, as Grah kersplats Draikk simply by materializing.
- Telefrags also ignore whether the telefragged is invulnerable or not and just outright splats them. To be exact, "invulnerable" (whether by Power-Up or by God Mode cheat) means "immune to attacks scoring 1000 Hit Points or less of damage", but a telefrag does 10,000 HP damage.
- Teleporter Accident: A teleporter breaches hell in the backstory.
- And they just plain fail in Doom 3. Only they actually succeed. Betruger's teleporter "malfunction" was a deliberate reaction to Swann and Campbell nosing around.
- "He went to one galaxy, his ass went to another."
- Doom 3 has a PDA Audio entry detailing a lab monkey being split in half. Literally. The upper half went there and the lower half stayed behind.
- Teleporting Keycard Squad: More often than not, you can expect to find a horde of demons swarming upon you when you pick up a keycard.
- There Is No Kill Like Overkill: The "Russian Overkill" mod adds dozens of ludicrously-overpowered weapons (and some that are not quite so overpowered but are either funny, clever, or just plain bizarre) that effectively remove any challenge the game ever had. At least one weapon's alternate-fire mode can one-shot a Cyberdemon. To say that some of these guns can wipe out an entire level's monster population with a single round is, in many cases, barely an exaggeration.
- Title Drop: In Doom 3, Councillor Swann states that if the demons get control of the ships, everyone on Earth is "Doomed". In The Lost Mission from the BFG Edition, the load screens for Hell and Hell Outpost include a pair of quotes from the bible about the coming "Day of Doom".
- Doom 64 has a sort-of example, with the final map being named after the original title for the game: The Absolution.
- Trope Codifier: For the FPS genre. For years, all FPS games were known as "Doom clones".
- The rude, manly space marine has become ubiquitous since then.
- The "crate maze", as first seen in E2M2: Containment Area, has also become an FPS cliché. It originated as a good way to have a large area without overtaxing the engine.
- To Hell and Back: Once per game. All of them one hell of a trip.
- Unique Enemy: In Doom 3, in the second level you encounter a "fast zombie" in the infirmary. It can run almost as fast as you can, and would have made a pretty challenging enemy if encountered in large numbers. The one you see in the infirmary is the only one in the entire game, with all other zombies being the standard "slow shambling" type.
- Fridge Brilliance kicks in when you realize said zombie...isn't actually a zombie, but rather an insane man that went to town on his body with a scalpel and had been, until the moment all hell broke loose, kept heavily sedated (As noted in the Doctor's audio log).
- Unwinnable by Mistake:
- E2M4: In version 1.1, approaching the yellow key, retreating to a different room, and returning causes the crushing ceiling to be permanently lowered and sometimes blocking access to the key. That version forgot the original ceiling height whenever the crusher stopped.
- "Dead Simple" from Doom II: The central stair raises once you kill all Arachnotrons. If played on Nightmare, Arachnotrons can respawn and be killed off again, allowing you to raise the central stairs out of reach.
- "Pharaoh", the first secret level from TNT: Evilution, is Unwinnable in single-player mode, but not co-op mode. This is due to the yellow key being marked as "Multiplayer-Only". (But you can still complete it using straferuning, an engine bug.)
- You can patch your TNT-IWAD with Doom Patcher. It will create an IWAD without said bug. However, it won't fix the node-building error which is also present, so you will still be unable to get 100% kills. It's far better to use the official TeamTNT PWAD to fix both these bugs.
- "Even Simpler" from Doom 64 is basically a remake of "Dead Simple," only with Pain Elementals thrown in. You have to kill every enemy, including the Lost Souls they shoot out, to advance. If they're killed next to some walls, however, the Souls they are supposed to shoot out get sucked into the walls, making it impossible to kill them.
- In Doom 3 a number of doors are supposed to lock behind you once you walk through them. However, it's possible to walk through one of these doors and then back out before they close (usually because an enemy jumped out at you), and end up on the wrong side of the door when it locks, causing you to be unable to proceed furthur.
- Unwitting Pawn: The marine from Doom 3 will become this if he sends the signal from Mars to Earth for reinforcements, playing right in to Dr. Betruger's hands. If not, Betruger will send it himself.
- Updated Re-release: After 8 years, Doom 3 was re-released as Doom 3: BFG Edition. It's primarily geared towards bringing the game to consoles (the only previous console release was for the original Xbox, and had noticeably decreased graphics to run on the system), but is available for purchase on the PC as well. The updated release includes improved lighting and rendering (although not as modernized as, say, the fan-made Sikkmod mod), support for 3D TV display, and (only on the PC version) support for the Oculus Rift VR headset. It also has console-oriented features such as achievements and save checkpoints. A new set of levels called "The Lost Missions" are part of the game as well. The entire game has been tweaked to be more action-oriented and closer to the feel of the original games, in contrast to the slower-paced, more survival horror-like presentation Doom 3 originally had. This includes faster player speed, less ammo hunting, slightly redesigned levels, an armor-mounted flashlight, etc.
- Ultimate Doom added no new monsters or weapons (not even the new ones added in Doom II), really just a new episode, to the original game. It was basically an excuse to get Doom (formerly distributed as shareware) sold in retail stores.
- The Xbox LIVE Arcade version of Ultimate Doom and Doom II has updated graphics and music, and online multiplayer. These treatments were also added for PlayStation Network's Doom Classic Complete compilation.
- Video Game Cruelty Potential: All of the survivors you meet in Doom 3 can be straight up murdered either for giggles or to charge the nightmare mode item; you can even do this before the demonic invasion begins. In fact, this is actually a smart thing to do, as many of the civilians in the intro sequence become zombies. One of the cruelest is activating a machine that will strip or melt the flesh off a scientist's bones, complete with a few seconds of horror and terror as the scientist realizes what is about to happen to him. In the BFG Edition, this one gets you an achievement.
- Villain-Beating Artifact: The original version of Doom 3 requires that the player use the Soul Cube to take care of the final boss Cyberdemon. This was changed both in later patches of single-player mode and in co-op mode.
- The Unmaker and Demon Artifacts in Doom 64 are a partial example. Neither are required to beat the Mother Demon, but each of the artifacts shuts down one of the enemy spawn points in the final level, as well as powering up the Unmaker until it's the most powerful weapon in the game.
- The Walls Have Eyes: Some wall sprites have moving walls of faces staring at you, and in later episodes/levels of Doom the switches are now stone heads whose eyes glow when you hit them on. Other switches are just eyes protruding out of fleshy patches, closing when activated.
- The War Sequence: Custom levels pitting the player against massive hordes of enemies (called "slaughter maps") are somewhat popular amongst the Doom community, the official Doom levels have a couple of their own as well, the most infamous being Go 2 It from Final Doom, which is a remixed version of the first stage from Doom II with over 200 enemies, including 19 Arch-Viles and 13 Cyberdemons (fortunately, you don't have to fight them all at the same time; unfortunately, you do have to fight up to 4 at a time.)
- Weird Moon: Most of the first game occurs on Phobos and Deimos, which are the Martian moons. They are both represented as sort of small planets / big moons with an atmosphere. The actual Phobos and Deimos are just tiny bare rocks and the whole areas of Episode 1 (Phobos) and Episode 2 (Deimos) of the game are each bigger than the moons themselves.
- Well-Intentioned Extremist: The Archvile is an evil healer. His death sound is a girl saying "why?" (much distorted); he wonders why on earth anyone would want to kill him, since from his point of view he's only doing good (by resurrecting dead monsters). He's also trying to burn you to death in the meantime, which he apparently can't imagine you'd be upset about.
- Who Forgot the Lights?: Doom 3 is widely thought of as suffering from this; in particular, the "duct tape mod" that allows weapon-mounted flashlights remains the most popular download for the game.
- THERE'S NO DUCT TAPE ON MARS.
- Entire sections of Doom 1 and 2 would either take place in dim light, or flickering Blackout Basement-styled areas.
- Fortunately, keen players were able to see in all but the darkest of areas without the light-amp goggles on DOOM's default rendering (the engine rendered everything below a certain light level as pure black). However, playing the games on Zandronum's OpenGL option causes these areas to become near pitch black. There's still the savior of the automap.
- Doom 64 likes to throw in dark levels as well, the Dark Citadel being the most egregious example.
- With This Herring: Hand waved in the first couple of Doom games, where you initially do battle with the legions of Hell while carrying a single pistol. This is explained by the Excuse Plot saying that you were a sentry stationed outside the base while everyone else went in. Naturally, all those people with the huge guns got killed and you're the only one left. This does not come off as being particularly convincing. This is averted in Brutal Doom, in which the pistol is replaced by an assault rifle which remains useful for the whole game.
- Played painfully, unjustifiably straight in Doom 3's Expansion Pack, Resurrection of Evil. Aside from the unmitigated, Genre Blind stupidity required to head back to Mars after the events of Doom 3, the company still doesn't equip the marines tasked with exploring ancient ruins with anything deadlier than a pistol. At least they've taped a flashlight to the gun.
- Played straight in the Doom clone Fortress of Dr. Radiaki, in which you start as a top-notch agent sent to investigate mysterious island... with a pistol and a goddamn baseball bat. Underfinancing, indeed.
- You Have Failed Me: Surprisingly averted for once. While it seems that Betruger suffers this fate by the end of Doom 3, the Expansion Pack Resurrection of Evil revealed that not only did the demons give him a safe sanctuary in Hell so that he wouldn't suffer from human retaliations, despite his plans failing, but they also gave him a new, stronger and flight-capable demonic body and supernatural powers as well a commanding rank in the demonic hierarchy.
- You Keep Using That Word: Doom started the FPS trend of misusing the word "chaingun" to refer to rotary guns; a chaingun is actually a single-barrel weapon which operates its bolt with an electrically-driven chain.