History VideoGame / DOOM

* SlidingScaleOfSillinessVsSeriousness: The first three games are generally pretty serious (''VideoGame/Doom3'' more so), but have bouts of goofiness and BlackComedy here and there. ''VideoGame/Doom2016'', in comparison, is much sillier, with a tongue-in-cheek plot involving an ObviouslyEvil MegaCorp fracking hell for resources, largely comedic codex entries, many cases of AscendedMeme, and [[https://www.youtube.com/watch?v=FNeN2CqB7F0 some pretty out there]] [[EasterEgg Easter Eggs]]. Even the Doom Marine has his moments in this one.

''Doom'' has been ported to many, many console systems over the years. The UsefulNotes/PlayStation and UsefulNotes/SegaSaturn 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 UsefulNotes/{{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 [[DoomDoors sound effect for doors opening]], which has been re-used in many SpeculativeFiction series for all sorts of things.

* HyperspaceArsenal: Where the [[{{Pun}} 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.

* TheArtifact: 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.

* InsurmountableWaistHeightFence: 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.

** At the end of Doom 64 the marine decides he has to stay in hell indefinitely to make sure the demons don't come back

* GettingCrapPasttheRadar: The rear of the Cacodemon sprites shows [[spoiler:two rather [[https://www.spriters-resource.com/resources/sheets/25/27868.png suspicious-looking holes.]]]]

** Amped up in the 2016 remake is an even MORE DIFFICULT "Ultra-NIGHTMARE!!" difficulty. Take the entirety of what makes the original "NIGHTMARE!" difficulty so brutal, and add YouOnlyLiveOnce to it. If you die, you return straight back to where you bust out of the sarcophagus..[[note]]This mode is only unlocked after completing the fifth chapter of the game.[[/note]]

** The ''Back to Saturn X'' series has gorgeous maps and impressive detail... and now realise that it's designed to run under the '''vanilla''' engine, within its mapping limits as noted above. The trickery used to make bridges appear 3D as well texture cheats to create the illusion of sloped or curved arches are incredible.

** NM100S - Nightmare, 100% secrets

** The name ''Doom'' was chosen as a ShoutOut to Tom Cruise's pool cue in ''Film/TheColorOfMoney''.

** And, to a lesser extent (at least in the base game), there's the fact that due to the way {{hitscan}} 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.

** It eventually made its way into ''Doom 3'', albeit with a redesigned appearance.
** The cover also depicts another Marine rushing to his friend's aid, even though there are no Marines in the game but you ([[EverybodysDeadDave at least, none that are still living]]).
*** Unless, of course, if you count multiplayer. But if that's the case, maybe that other Marine is not exactly rushing to his friend's aid...

* AmmunitionBackpack: 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 and 100 shells instead of 200 and 50, and so on).

* ArmorMeterPoints: The series lists both the player character's health and his armor. As the armor suffers cumulative damage, the monsters' attack points get apportioned in increasing share against the player character's health percentage.

** The BFG Edition and XBLA version of ''Doom II'' [[https://www.youtube.com/watch?v=1snCRIl16ks completely purges]] the secret ''VideoGame/Wolfenstein3D'' levels of every ''Wolfenstein'' element: NoSwastikas 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 levels have been renamed ("Wolfenstein" to "[[ClassicCheatCode IDKFA]]" and "Grosse" to "[[VideoGame/CommanderKeen Keen]]") The red crosses on health packs were also removed, replaced with little red-and-white pills because of complaints by the International Red Cross about use of their symbol. Purists were ''not happy''.

* PasswordSave: 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 do not.

* YourHeadAsplode: In the PS1 and Sega Saturn versions when you get gibbed, the status bar face explodes rather than being all caved in and dead like a normal death. The 3DO version explodes the face no matter how you die.

* ImperialStormtrooperMarksmenshipAcademy: Enforced with the Partial Invisibility power-up. Enemies can still see you, but since it implies that they can only tell the general area you're in, it drastically reduces enemy accuracy and causes them to fire wildly in your vicinity.

* ActionizedSequel: 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 SurvivalHorror elements to the mix.

* AllThereInTheManual: The backstories to just about all the classic series games.

* DamageSpongeBoss: Cyberdemons and Spider Masterminds.

In 2016, id Software released another game [[RecycledTitle simply titled]] ''Videogame/{{Doom|2016}}'', a re-railing of the franchise, known to most fans as ''Doom 4''. ''Doom'' used to be known as ''Doom 4'' when it was revealed in 2007, but the game went through TroubledProduction, so id decided to revive it. The reboot is more of an ActionizedSequel compared to ''Doom 3'', featuring faster gameplay and more emphasis on shooting rather than horror. It also purposely calls back to the gameplay of the first two titles by avoiding modern FPS mechanics like emphasis on cover, weapon reloading, and [[LimitedLoadout limited weapon loadouts]].

* ShortRangeShotgun: The original pump-action shotgun has a modest spread that will allow a good amount of its 7 pellets to hit at long distances, to where it can even be used as an effective sniping weapon in a pinch. The double-barreled shotgun from ''Doom II'' however plays this trope completely straight and was probably the {{Trope Maker|s}}; it shoots 20 pellets, that altogether will deal damage equivalent to a direct hit from a rocket, but its spread is huge and will deal vastly reduced damage at farther than arm's reach against anything that isn't a large target, while being absolutely pitiful against long-distanced targets. The sheer power and great ammo efficiency of it, combined with the player's tremendous movement that allows them to safely weave in for close-ranged shots, makes the Super Shotgun extremely useful to the point that it's generally the default weapon to use among higher-level players.

** The finale of Doom II says "You wonder where [[MeatPuppets bad folks will go when they die]], now."

* SplashDamage: The always venerable rocket launcher, along with the classic ExplodingBarrels. 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.

* StealthyMook: the Spectres are partially invisible versions of the pink Demons. This ability is not true invisibility (except in dark rooms) but is enough to trip up a player if they're not totally observant.

* SuperTitle64Advance: ''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 (like ''VideoGame/{{Hexen}} 64'' and ''[[VideoGame/DukeNukem3D Duke Nukem 64]]'' were,) when in fact it is a unique game.

* TropeCodifier: For the FPS genre. For years, all FPS games were known as "''Doom'' clones".

** "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 straferunning, an engine bug.)
*** An [[http://teamtnt.com/bugfixes.htm official patch]] from [=TeamTNT=] was made available to fix this bug as well as a node-building error that would prevent 100% Kills. It wasn't until the Website/GOGDotCom release of ''Final Doom'', however, that this patch was integrated into a widely-released version of ''Evilution''.

* ViolationOfCommonSense: You'd have to be crazy in order to take on and kill a Cyberdemon with nothing but your fists. Yet that's exactly what you have to do to get the "You Have Huge Guts" achievement in the XBLA release of ''Doom II'', and the "Knuckle Sammich" achievement in the [=PS3=] collection. At the very least, you can soften him up first.

* TheWarSequence: 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.)

->''"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..."''
-->-- '''Creator/TerryPratchett'''

* ExpansionPack: ''Final Doom'' contained two of them in one stand-alone game.