Basically, this happens when the [[NumberedSequels numbering of sequels]] gets really, ''really'' complicated. A SequelNumberSnarl often occurs when {{Sequel}}s and {{Interquel}}s start filling up the chronology, but then gets fouled up by the addition of an {{Oddly Named Sequel|2ElectricBoogaloo}} or two (or five...) whose title ''doesn't'' include a number. [[ContinuityReboot Reboots]] and {{Alternate Continuit|y}}ies can make even more of a mess.

A subtrope of NumberedSequels. See also ColonCancer.
!! Examples:


* ''Literature/TheRing'' series is somewhat baffling.
** A 1995 film, named ''Ring'' and rereleased as ''Ring: Kanzenban''
** Hideo Nakata series: ''Ring'', ''Rasen'', ''Ring 2'' (which ignores the events of ''Rasen'') and a prequel ''Ring 0: Birthday''
** American films ''Film/TheRing'', ''Rings'' (a short DVD-only film) and ''TheRingTwo''
** Korean film ''The Ring Virus''
* The ''Franchise/{{Rambo}}'' series goes ''Film/FirstBlood'', ''Film/RamboFirstBloodPartII'', ''Film/RamboIII'', and then ''Film/{{Rambo}}'' (also known as ''[[MarketBasedTitle John Rambo]]'' or ''[[NumberedSequels Rambo IV]]'' in certain countries). Film critic Roger Ebert pointed out that technically, ''Film/RamboIII'' should have been entitled ''Rambo II: First Blood Part III'', which, he supposed, would have caused film executives heads to explode in confusion.
* In Italy, ''Film/DawnOfTheDead'' was dubbed under the title of ''Zombi'', spawning two unauthorized sequels by local producer Lucio Fulci: ''Zombi 2'' and ''Zombi 3''. In the U.S., ''Zombi 2'' was retitled ''Zombie'' and marketed as a standalone movie with no ties to ''Dawn of the Dead'', but ''Zombi 3'' kept its original numbering, making it seemed as if there was another movie in-between. To add further confusion, two unrelated movies by ''Zombie 3'' co-producer Claudio Fragasso [[MarketBasedTitle were marketed as]] Zombie sequels in the U.S.: ''After Death'' (aka ''Zombie 4'') and ''Killing Birds'' (aka ''Zombie 5''). In the U.K., all four of these movies were released under the title ''Zombie Flesh Eaters'' title and were numbered appropriately.

[[folder:Live Action TV]]
* ''Franchise/PowerRangers'' gained a bit of this in terms of season numbers when Disney decided to ReCut part of [[Series/MightyMorphinPowerRangers the first season]]. Officially, the ReCut is Season 18, but fans are reluctant to name glorified reruns as a full season and generally consider the following span of ''new'' episodes, ''Series/PowerRangersSamurai'', as the actual Season 18.
** ''Samurai'' itself was stretched over two years, with the second half retitled ''Power Rangers Super Samurai'', leaving fans unsure whether to count it as one two-year season or two one-year seasons.
** And then there's ''Series/PowerRangersMegaforce''. It was first declared to be a two-year series, appearing to be the same situation as ''Samurai''. But then it came out that ''Megaforce'''s second year would adapt material from ''two'' ''Franchise/SuperSentai'' series instead of just one, complicating matters. We'll have to wait until it actually airs to see how this is going to play out.
** Long before these, there was ''Mighty Morphin' Alien Rangers'', a transitional period between the third season of ''Series/MightyMorphinPowerRangers'' and ''Series/PowerRangersZeo''. It's commonly considered Season 3b, being too short to be a season in itself and sharing enough with ''Mighty Morphin''' S3 to be lumped in with it.
* ''Franchise/SuperSentai'' itself also underwent a similar situation. The first two Sentai shows, ''Series/HimitsuSentaiGoranger'' and ''Series/JAKQDengekitai'', which Toei co-produced with Ishinomori Production, were not counted among the later Super Sentai shows that Toei produced independently starting with ''Series/BattleFeverJ''. As a result, the premiere of ''Series/KousokuSentaiTurboranger'' served as the tenth anniversary of the series, while ''Series/GoseiSentaiDairanger'' was originally considered the fifteenth series. Somewhere along the lines, ''Goranger'' and ''J.A.K.Q.'' were retroactively added to the franchise's count, making the earlier anniversary shows before their inclusion seem odd in retrospect.
* The ''Franchise/KamenRider'' franchise has a similar issue, not with the number of shows, but with the official number of main Riders:
** The first ''Series/KamenRider'' series had two main Riders: Rider 1 and Rider 2. Simple enough.
** The second series, ''Series/KamenRiderV3'', featured a secondary character named Riderman, a villain who underwent a HeelFaceTurn. Despite the fact that Riderman was not a main character, he shows up in many of the subsequent crossover movies and specials as the fourth main Rider.
** Series/KamenRiderStronger, the seventh Rider (and fifth series), had a female sidekick named Tackle. Unlike Riderman though, she is not counted as an official Rider.
** The main riders of the ninth and tenth series, Series/KamenRiderBlack and Series/KamenRiderBlackRX, were originally counted as one Rider since they were different alter-egos of the same character (RX being an upgraded form of the original Black). Thus, RX was counted as the eleventh Rider when the older Riders guest-starred in his show. However, Black and RX have been counted as separate characters ever since RX guest-starred in a two-part episode of ''Series/KamenRiderDecade'' where he teamed up with an alternate universe version of himself who retained his original Black form.
** All of the Rider shows from ''Series/KamenRiderAgito'' and onward had numerous secondary Riders (including movie-exclusive characters) in addition to the titular protagonists[[note]]''Series/KamenRiderRyuki'' for example had 13 Riders (some of them villains), plus two pseudo-Riders[[/note]]. ''Series/KamenRiderDecade'' established the official number of Riders by counting all of the Riders from Rider 1 to [[Film/KamenRiderJ J]] (with Black and RX being established as separate individuals at this point) and counting only the titular Riders from Series/KamenRiderKuuga and onward.
** The official count leaves out the alternate versions of the first three Riders who were in the reboot movies (''[[Film/KamenRiderTheFirst The First]]'' and ''[[Film/KamenRiderTheNext The Next]]''), as well as Film/KamenRiderG (a Rider created for a one-off parody).
* ''Series/DoctorWho'' season numbering can be equally confusing. Does Nu Who start again, which means distinguishing between two Season Ones? (TheOtherWiki calls Creator/WilliamHartnell's first season Season 1, and Creator/ChristopherEccleston's season Series 1, as does Creator/TheBBC website - while still being at pains to point out that it's all the same series.) Or do you just keep going past Season 26, as many fans do? (ThisVeryWiki's Recap page lists both.) Creator/StevenMoffat confused things further by claiming in ''Magazine/DoctorWhoMagazine'' that if Creator/MattSmith's first season wasn't Season 31 (because it's all one thing), then it was Series 1 (since it was as much a split from what had come before as the initial relaunch), before later admitting that he'd called it Series 5 in all practical situations. And then there's the split series 6A and 6B (Not to be confused with ''[[{{Fanon}} Season 6b]]'') ... or season 32A and 32B.

* The Traveling Wilburys named their first album ''Traveling Wilburys Vol. 1'', and their second album ''Traveling Wilburys Vol. 3'' -- either as a joke, or to reference their involvement in the charity album ''Nobody's Child: Romanian Angel Appeal'', which featured a track by the Wilburys, as well as two GeorgeHarrison songs, as a supposed Vol. 2.
* {{Chickenfoot}}'s second album is ''Chickenfoot III'' to spoof SophomoreSlump.
* The original 1984 version of "Do They Know It's Christmas?" was performed by a SuperGroup named Band Aid. A cover was made in 1989, whose supergroup was called Band Aid II. However, when a second cover was made in 2004, the supergroup was called Band Aid 20.

* Windows 7. In the software numbering, it's 6.1. Going on major design changes, it ''is'' the seventh iteration (NT/95/98/ME being the fourth, 2000/XP being the fifth, Vista being the sixth). But as far as major releases go, it's the ninth (NT/95, 98, 2000/ME, etc).
** This has continued with Windows 8 (software number: 6.2) and Windows 8.1 (6.3).
** The sequel to Windows 8 is not named Windows 9 as everyone was expecting, but rather Windows 10. Internally it's 6.4.

[[folder:Tabletop Games]]
* The various ''TabletopGame/{{Dungeons and Dragons}}'' editions are titled ''Dungeons and Dragons'', ''The Dungeons and Dragons Basic Set'', ''Advanced Dungeons and Dragons'', ''Basic Dungeons and Dragons'', ''Advanced Dungeons and Dragons Second Edition'', ''Dungeons and Dragons 3rd Edition'', ''Dungeons and Dragons Revised Edition'' (referred to as ''D&D 3.5'' by the fans and the publisher), ''Dungeons and Dragons 4th Edition'', ''Dungeons and Dragons Essentials'', and the upcoming ''D&D Next'', which was renamed ''Dungeons and Dragons 5th Edition'' for its official release, despite actually being the 10th version of the game.

[[folder:Video Games]]
* ''VideoGame/SilentHill'' had three {{numbered sequel}}s, a prequel (''[[VideoGame/SilentHillOrigins Origins/Zero]]''), a subtitled sequel (''[[VideoGame/SilentHillHomecoming Homecoming]]''), and a reimagining of the first (''[[VideoGame/SilentHillShatteredMemories Shattered Memories]]''). The next, ''[[VideoGame/SilentHillDownpour Downpour]]'', was slated to be released as ''8'' until someone realized the problem.
* ''VideoGame/SuperMetroid'' and ''VideoGame/MetroidFusion'' were called "Franchise/{{Metroid}} 3" and "Metroid 4" respectively in their opening sequences. ''VideoGame/MetroidPrime'' came out the same time as ''Fusion'', and was intended to be just an aside between the original and ''Return of Samus''. But then the ''Prime'' series was a runaway success, creating 2 sequels and 2 spin-off titles. And ''then'', there's ''VideoGame/MetroidOtherM'', an interquel between ''Super'' and ''Fusion'', that came out in 2010. This may prompt Nintendo to drop the classic system of numbering if the 2D sequel to ''Fusion'' ever comes out.
* ''Franchise/StreetFighter'', which was released in the order ''[[VideoGame/StreetFighter I]]''-''[[VideoGame/StreetFighterII II]]''-''[[VideoGame/StreetFighterAlpha Alpha]]''-''[[VideoGame/StreetFighterIII III]]''-''[[VideoGame/StreetFighterIV IV]]''. Chronologically, it's ''I''-''Alpha''-''II''-''IV''-''III''.
** Then there's the ''VideoGame/StreetFighterEX'' series, a polygonal offshoot of ''VideoGame/StreetFighterII''. In terms of plot, the original game was intended to be a side-story set during the events of ''II'', but since the series was developed by Arika (who own the rights to the new characters introduced in the series), it evolved into its own continuity instead.
* ''VideoGame/FinalFantasyIV'' was originally released in America as ''II'', and ''VideoGame/FinalFantasyVI'' as ''III''. Synchronising the sequels as of ''VII'' confused Americans briefly, but the numbering has caught on.
** The VirtualConsole releases of ''Final Fantasy IV'' and ''VI'' in America, being straight emulation of the SNES versions, kept the earlier Americanized numbering, despite the fact that there were already ports of those game for the PlayStation and GameBoyAdvance that restored the original numbering.
** Then you have ''VideoGame/FinalFantasyX2'' (and later, ''VideoGame/FinalFantasyXIII2'', which would be followed by [[VideoGame/LightningReturnsFinalFantasyXIII a second sequel]] to ''XIII''), which muddy things further.
** ''Then'' you have ''VideoGame/FinalFantasyXI'' and ''VideoGame/FinalFantasyXIV'', which are [=MMOs=] and have more in common with each other than with any of the other numbered entries or than the direct sequels have in common with the numbered entries that spawned them.
** A case can also be made for ''VideoGame/FinalFantasyXV'', considering that it began life as ''Final Fantasy Versus XIII''. Despite [[{{Vaporware}} eventually]] becoming the fifteenth numbered entry, it still counts as part of the ''Franchise/FabulaNovaCrystallisFinalFantasy'' series that consists of ''XIII'' (and its sequels) and ''[[VideoGame/FinalFantasyType0 Type-0]]''.
* ''VideoGame/{{StarCraft|I}}'' was initially released on 31 March 1998. By 2009 the franchise included various novels, add-ons, etc., as well as a major ExpansionPack, ''Brood War''. When ''[[VideoGame/StarCraftII Starcraft II]]'' came out in 2010, there was a noticeable DoubleTake by some fans at the fact that it was "only" the first sequel.
* Similarly, the ''VideoGame/{{Homeworld}}'' franchise consists of three major installments, ''Homeworld'' (1999), ''Homeworld: Cataclysm'' (2000), and ''Homeworld 2'' (2003)
* ''VideoGame/CallOfDuty'' had its fourth game named ''Call of Duty 4: VideoGame/ModernWarfare''. Its sequels are named ''Modern Warfare 2'' and ''Modern Warfare 3''. Then there's ''VideoGame/CallOfDutyBlackOps'', which is arguably a spin-off from ''Modern Warfare'', but isn't given the ''Modern Warfare'' tagline.
* The Gorky series began with ''Gorky 17'' (also known as ''VideoGame/{{Odium}}''), then ''Gorky Zero'' and then ''Gorky 02''.
* While officially titled simply ''VideoGame/{{Mortal Kombat|9}}'', the 2011 reboot of [[Franchise/MortalKombat the series]] is considered by developer Creator/NetherrealmStudios to be the ninth proper fighting game installment in the franchise, counting the earlier crossover game ''VideoGame/MortalKombatVsDCUniverse'' as the eighth. However, the sequel to it, which would be ''Mortal Kombat 10'' under that numbering scheme, was briefly titled "Mortal Kombat 2" during the early planning process (or as Ed Boon jokingly put it, "[[ Mortal Kombat 10: We Lost Count"]]). And one could be easily forgiven for mistaking ''Deadly Alliance'', ''Deception'', and ''Armageddon'' for spin-offs instead of the fifth, sixth, and seventh entries in the main series respectively. The tenth game was eventually titled ''VideoGame/MortalKombatX'' (as in the letter "X", not ten).
* The ''VideoGame/LegacyOfKain'' series started out with ''Blood Omen: Legacy of Kain''. The sequel shifted the subtitle to the forefront and was titled ''Legacy of Kain: Soul Reaver''. This was followed by ''Legacy of Kain: Soul Reaver 2'' and then by ''Legacy of Kain: Blood Omen 2'', the reasoning being that they were sub-series, the ''Blood Omen'' games featuring Kain as protagonist and the ''Soul Reaver'' games following Raziel. The developers finally did away with the "numbered sub-series" idea when they released the fifth and currently final game titled ''Legacy of Kain: Defiance'' which follows both.
* The ''VideoGame/AceCombat'' series contains six numbered games (of which ''[[VideoGame/AirCombat 1]]'' and ''[[VideoGame/AceCombat2 2]]'' weren't originally part of the main continuity, and ''[[VideoGame/AceCombat3Electrosphere 3]]'' is set [[DistantFinale after]] ''[[VideoGame/AceCombat04ShatteredSkies 04]]'', ''[[VideoGame/AceCombat5TheUnsungWar 5]]'', and ''[[VideoGame/AceCombat6FiresOfLiberation 6]]'') and five oddly-numbered ones: ''[[VideoGame/AceCombatAdvance Advance]]'' (prequel to ''3''), ''[[VideoGame/AceCombatZeroTheBelkanWar Zero]]'' (prequel to the entire series and, more specifically, ''5''), ''[[VideoGame/AceCombatX X]]'' (released before ''6'' but set after it), ''[[VideoGame/AceCombatXiSkiesOfIncursion Xi]]'' ([[HeroOfAnotherStory interquel]] to ''X''), and ''[[VideoGame/AceCombatJointAssault X2]]'' (which was eventually stripped of the "number" because it had nothing to do with ''X'' except the [[PlayStationPortable platform]]). Thankfully, Namco StoppedNumberingSequels at ''VideoGame/AceCombatAssaultHorizon''.
* An OlderThanTheNES example of this trope is Atari's ''Sprint'' series of arcade games. ''Sprint 2'' started the series in 1976, followed by ''Sprint 4'', ''Sprint 8'', ''Sprint One'' (switching from Arabic numerals to words), ''Super Sprint'', ''Championship Sprint'', and finally ''Badlands'' (which is ''Sprint'' in a [[AfterTheEnd post-apocalypse]] setting). The confusing thing is that the numbers in the first four ''Sprint'' titles do not indicate the game's order in the series. It actually indicates how many human players can race at the same time. So ''Sprint One'' got its name for being a one player game, even though it was the fourth in the series chronologically.
* The first game in the ''VideoGame/{{Gex}}'' trilogy is simply called ''Gex'', and the last one is called ''Gex 3: Deep Cover Gecko'', but the second game is called ''Gex: Enter the Gecko'', no "2" involved.
* The ''VideoGame/{{Battlefield}}'' series has this. ''Battlefield 2'' was actually the third installment, for instance (which makes some sense; ''Battlefield Vietnam'' wasn't as well-received as ''1942''). ''VideoGame/{{Battlefield 3}}'', on the other hand, is at the very least the ''eleventh game'' in the series.
* ''Franchise/ResidentEvil'' had its first three numbered installments on the PlayStation, which were then followed by ''VideoGame/ResidentEvilCodeVeronica'' on the [[SegaDreamcast Dreamcast]]. Despite not being a numbered installment (a result of the game originally developed as a Dreamcast exclusive before Sega discontinued their hardware sales and allowed the game to be ported to other consoles), ''Code: Veronica'' is considered a main title, not only continuing the story from where ''VideoGame/ResidentEvil2'' left off, but actually brought back Albert Wesker as the main antagonist after he was killed off in the original game. The numbered series would move onto the [[NintendoGameCube GameCube]] with a remake of [[VideoGame/ResidentEvil1 the original]] (along with ports of the previous sequels), ''VideoGame/ResidentEvil0'' (a prequel) and ''VideoGame/ResidentEvil4'' before going for multiplatform releases from the get-go with ''VideoGame/ResidentEvil5''.
* The arcade version of ''VideoGame/{{Contra}}'' was followed by a solo sequel titled ''Super Contra'' and both games were eventually remade for the NES (the latter being shortened to ''Super C''). The NES games were followed by an SNES sequel titled ''Contra III: The Alien Wars'' and all subsequent sequels were left unnumbered until the release of ''Contra 4'' for the NintendoDS, which was actually the eleventh (non-port) installment in the series and an interquel set between ''Contra III'' and ''Contra Hard Corps''. To add further confusion, ''Contra III'' was actually the fourth game, since there was a GameBoy game titled ''Operation C'' released between ''Super C'' and ''Contra III'' (which was likely not counted at the time since it was a portable release).
** Note that this was never much of an issue in Japan, where none of the Contra sequels were numbered: ''Contra III'' was originally titled ''Contra Spirits'' and when ''Contra 4'' was localized there, it was retitled ''Contra: [[SuperTitle64Advance Dual Spirits]]''.
* The original ''{{Shinobi}}'' was released for the arcades in 1987, which was followed by two separately-developed sequels in 1989: an arcade sequel titled ''Shadow Dancer'', which featured the same play mechanics as the first game (but with the addition of a canine companion); and a sequel for the SegaGenesis titled ''The Revenge of Shinobi'', which featured completely different play mechanics from the arcade games (with a few elements borrowed from the SegaMasterSystem version of the first game, such as a health gauge and multiple ninjutsu spells). The Genesis later received two additional ''Shinobi'' games in the forms of ''Shadow Dancer: The Secret of Shinobi'' in 1991 (a remake of the arcade ''Shadow Dancer'' with the same play mechanics, but with different stages) and ''Shinobi III: Return of the Ninja Master'' in 1993 (the true sequel to ''The Revenge of Shinobi'')[[note]]In Japan, ''The Revenge of Shinobi'' and ''Shinobi III'' were titled ''The Super Shinobi'' and ''The Super Shinobi II'' respectively[[/note]]. To add further confusion, there was also a Master System-exclusive sequel released in Europe and Brazil titled ''The Cyber Shinobi: Shinobi Part II''.
* The ''Franchise/WonderBoy'' sequels consist of ''VideoGame/WonderBoyInMonsterLand'' (aka ''Super Wonder Boy: Monster World''), ''VideoGame/WonderBoyIIIMonsterLair'', ''VideoGame/WonderBoyIIITheDragonsTrap'' (aka ''Monster World II''), ''VideoGame/WonderBoyInMonsterWorld'' (aka ''Wonder Boy V: Monster World III'') and ''VideoGame/MonsterWorldIV''.
** Most of these alternate titles were the result of the games being retitled in different regions, but even in Japan the Sega Mark III ports of the first two arcade games were released under different names as well (the original ''Wonder Boy'' was retitled ''Super Wonder Boy'' and ''Wonder Boy: Monster Land'' became ''Super Wonder Boy: Monster World'').
** ''Monster Lair'' (the third arcade game) and ''Dragon's Trap'' (a Master System game) were developed and released almost at the same time, resulting in two different games being titled ''Wonder Boy III''. To make matters more confusing, the Japanese version of ''Dragon's Trap'', ''Monster World II'', wasn't even released until a later Game Gear port, a few months after its own sequel, ''Monster World III'', was released on the Mega Drive. Yes, a Japanese video game series experienced a SequelFirst syndrome in its own native country.
* Franchise/SonicTheHedgehog is starting to get like this. Officially, it goes ''VideoGame/{{Sonic the Hedgehog|1}}'' (released 1991), ''[[VideoGame/SonicTheHedgehog2 Sonic 2]]'' (1992), ''[[VideoGame/Sonic3AndKnuckles Sonic 3]]'' (1994), ''Sonic & Knuckles'' (1994) which is an [[MissionPackSequel expansion]] of ''Sonic 3'', ''[[VideoGame/SonicTheHedgehogCD Sonic CD]]'' (1993), ''[[VideoGame/SonicTheHedgehog4 Sonic 4: Episode I]]'' (2010), and then ''Sonic 4: Episode II'' (2012).
** ''Sonic CD'' isn't part of the classic Genesis Sonic series despite being tied to ''Sonic 4: Ep. II'''s plot, and ''Sonic & Knuckles'' is "Sonic 3: Ep. II."
** There's also the Dreamcast games ''VideoGame/SonicAdventure'' (ported to the [=GameCube=] as ''Sonic Adventure DX''), followed by ''VideoGame/SonicAdventure2'' (ported to the [=GameCube=] as ''Sonic Adventure 2: Battle'', not to be confused with the GameBoyAdvance game ''VideoGame/SonicBattle''). Storylines from this series continue into the multiplatform releases of ''VideoGame/SonicHeroes'', and then further into ''VideoGame/ShadowTheHedgehog''.
** There's also ''Sonic 3D Blast'', which was renamed ''VideoGame/Sonic3DFlickiesIsland'' in Europe, which has no direct connection to any other game, not in the least ''VideoGame/SonicBlast'' for the GameGear.
* ''Franchise/AssassinsCreed'' seems to be heading down this road. The first game was simply ''VideoGame/{{Assassins Creed|I}}'', the sequel was ''VideoGame/AssassinsCreedII'', followed by ''VideoGame/AssassinsCreedBrotherhood'' and ''VideoGame/AssassinsCreedRevelations''. It then went back to numbered sequels with ''VideoGame/AssassinsCreedIII'', which is the fifth game. The rule is that a numbered sequel means a new historical protagonist and setting, while an unnumbered one continues from the last. That's not counting the spin-offs.
* The arcade sequels to ''VideoGame/OutRun'' consist of ''Turbo [=OutRun=]'' (1989), ''[=OutRunners=]'' (1993), ''[=OutRun=] 2'' (2003), ''[=OutRun=] 2 SP'' (2004) and ''[=OutRun=] 2 SP SDX'' (2006).
* ''Double Dragon V: The Shadow Falls'' is a fighting game spin-off of ''VideoGame/DoubleDragon'' that featured character from the ''Double Dragon'' [[WesternAnimation/DoubleDragon animated series]]. While there was never an official "Double Dragon IV", ''Double Dragon V'' seems to be counting the SNES-exclusive ''Super Double Dragon'' (aka ''Return of Double Dragon'') as the fourth game in the main series. Whether anyone considers ''Double Dragon V'' to be a true ''Double Dragon'' sequel is a whole 'nother debate (since it's a game of a completely different genre developed by Leland Interactive without Technos' involvement and with little resemblance to the previous games).
* ''VideoGame/BubbleBobble'' (originally released for the arcades in 1986) was followed by numerous sequels such as ''VideoGame/RainbowIslands: The Story of Bubble Bobble 2'' (a 1987 arcade sequel that played nothing like the first game), ''Parasol Stars: The Story of Bubble Bobble III'' (a TurboGrafx16 sequel to ''Rainbow Islands'' released in 1991), ''Bubble Bobble Part 2'' (an NES sequel to the original game released in 1993), ''Bubble Symphony'' (the third arcade game in the series, released in 1994 and also known as ''Bubble Bobble II'' in North America) and ''Bubble Memories: The Story of Bubble Bobble III'' (the last game in the main series, released for the arcades in 1996).
* ''Tatakae Genshijin 3'', the third game in the series and the second one to star [[VideoGame/JoeAndMac Joe & Mac]] (the protagonists of the original game) is known as ''Joe & Mac 2'' in the US and ''Joe & Mac 3'' in Europe (note that there was a ''Joe & Mac Returns'' released around the same time, but it was an arcade game, whereas ''Joe & Mac 2/3'' is an SNES game). For those curious, ''Tatakae Genshijin 2'' was ''Congo's Caper''.
* ''VideoGame/GrandTheftAuto...'' hoo, boy. It goes ''[[VideoGame/GrandTheftAutoClassic Grand Theft Auto]]'', ''Grand Theft Auto: London 1969'', ''Grand Theft Auto: London 1961'', (the ''London'' games actually being {{mission pack|Sequel}}s), ''VideoGame/GrandTheftAutoII'', ''[[VideoGame/GrandTheftAutoIII GTA III]]'', ''[[VideoGame/GrandTheftAutoViceCity GTA: Vice City]]'', ''[[VideoGame/GrandTheftAutoSanAndreas GTA: San Andreas]]'', ''[[VideoGame/GrandTheftAutoIV GTA IV]]'', ''[[VideoGame/GrandTheftAutoIVTheLostAndDamned GTA IV: The Lost and Damned]]'', ''[[VideoGame/GrandTheftAutoIVTheBalladOfGayTony GTA: The Ballad of Gay Tony]]'' (the latter two being DLC), and then ''[[VideoGame/GrandTheftAutoV GTA V]]''. If you include the portable games and ''Stories'' games, ''Grand Theft Auto V'' is the ''15th'' overall game in the series.
* The ''VideoGame/{{Doom}}'' sequels consists of ''Doom II: Hell on Earth'', ''Final Doom'' (built on the ''Doom II'' system), ''Doom 64'' (an [=N64=]-exclusive installment in the series), ''Doom 3'', ''Doom 3: Resurrection of Evil'' (an expansion of the original ''Doom 3'') and the upcoming ''Doom 4''.
* The ''Franchise/StarWars: VideoGame/DarkForces'' series continues the movies' approach at long chains of subtitles. The games include ''Star Wars: Dark Forces'', ''Star Wars: Dark Forces II - Jedi Knight'', ''Star Wars: Jedi Knight - Mysteries of the Sith'' (an expansion pack), ''Star Wars: Jedi Knight II - Jedi Outcast'', ''Star Wars: Jedi Knight - Jedi Academy''.
* ''VideoGame/SeriousSam: The Second Encounter'' (or "''TSE''") and ''Serious Sam 2'' (sometimes referred to as "''[=SS2=]''"" or "''II''") are actually two different games. The former is a MissionPackSequel to the original, while the latter is a completely new installmentóreleased well after ''The Second Encounter''ówith its own art style, setting and story line. Both of these were followed by ''Serious Sam 3: BFE'' ("''Before the First Encounter''") a prequel to the original game (referred heretofore as "''TFE''", or "''The First Encounter''"). And that's not counting ''Serious Sam HD'' and ''Serious Sam: The Second Counter HD'' which are {{Updated Rerelease}}s of ''TFE'' and ''TSE'', respectively.
* The main canonical games in the ''Franchise/MetalGear'' franchise, known collectively as the "Metal Gear Saga", consists of the original [=MSX2=] games, ''VideoGame/MetalGear'' and ''VideoGame/MetalGear2SolidSnake'', the original ''VideoGame/MetalGearSolid'' (which was originally titled "Metal Gear 3" during its early planning), its numbered sequels (''VideoGame/MetalGearSolid2SonsOfLiberty'', ''VideoGame/MetalGearSolid3SnakeEater'' and ''VideoGame/MetalGearSolid4GunsOfThePatriots''), the PSP game ''VideoGame/MetalGearSolidPeaceWalker'' (originally considered "Metal Gear Solid 5" during its development) and the upcoming ''VideoGame/MetalGearSolidVThePhantomPain''. There's also ''VideoGame/MetalGearSolidPortableOps'', a predecessor to ''Peace Walker'' not directed by Kojima, ''VideoGame/MetalGearRisingRevengeance'', a spin-off starring Raiden, and other sequels and spin-offs not part of the main continuity (''VideoGame/SnakesRevenge'', ''VideoGame/MetalGearGhostBabel'' and ''VideoGame/MetalGearAcid'').
* ''VideoGame/HalfLife'' started with ''Half-Life'', but then three subsequent games taking place at the same time chronologically that do add plot, ''Opposing Force'', ''Blue Shift'', and ''Decay'', were released. Then we get into ''Half-Life 2'', which is followed by ''Half-Life 2: Episode 1'', despite the fact that it's technically the second part if we count ''Half-Life 2'' as the first ''[=HL2=]'' episode. ''Half-Life 2: Episode 2'' is similarly the third part of the ''[=HL2=]'' story arc. There's also the bonus level demos ''Half-Life Uplink'' and ''Lost Coast''.
* ''VideoGame/{{Kingdom Hearts|I}}'' was followed by ''VideoGame/KingdomHeartsChainOfMemories'', then ''VideoGame/KingdomHeartsII'', which is actually the third game. It was then followed by an interquel, ''VideoGame/KingdomHearts358DaysOver2'', a prequel, ''VideoGame/KingdomHeartsBirthBySleep'', and a sequel, ''VideoGame/KingdomHeartsCoded''. After that came ''VideoGame/KingdomHearts3DDreamDropDistance'', which is implied to be followed by ''VideoGame/KingdomHeartsIII''. To simplify, ''Kingdom Hearts II'' is the third game and second sequel, and ''Kingdom Hearts III'' will be the eighth game and the sixth sequel. It's not ''too'' confusing a system when you remember that the numbered games are on consoles, rather than handhelds.
* The ''Franchise/SuperMarioBros'' franchise has two different games titled ''VideoGame/SuperMarioBros2'': the original Japanese version (aka ''VideoGame/SuperMarioBrosTheLostLevels'') and the version that the rest of the world is familiar with (which later saw a release in Japan as ''Super Mario USA''). This was done since Nintendo of America considered ''Lost Levels'' to be [[MissionPackSequel too much of a rehash]], in addition to being [[SequelDifficultySpike too difficult compared to the original]], and wanted their own version of ''Super Mario Bros. 2'' to publish in its place (presumably to avoid the conundrum of having to renumber ''VideoGame/SuperMarioBros3'' when it came time to localize that game in the west, which is what they would've done had they decided to just skip ''Lost Levels'' completely without releasing a substitute game).
** Strictly speaking, ''VideoGame/SuperMarioLand 3: VideoGame/WarioLand'' and ''VideoGame/SuperMarioWorld 2: VideoGame/YoshisIsland'' weren't really proper sequels, but rather spin-offs of their predecessors, which is why their respective sequels dropped the original titles and went by the subtitle instead (e.g. ''Wario Land II'' instead of ''Super Mario Land 4'', ''Yoshi's Island DS'' instead of ''Super Mario World 3''). Interestingly, the original ''VideoGame/SuperMarioWorld'' was originally going to be titled ''Super Mario Bros. 4'' and this {{working title}} was still used on the packaging of the Japanese version (it isn't used in the actual title screen).
** The ''Super Mario Advance'' series had its own numbering system, despite the games themselves simply being GBA ports of the NES/SNES titles. This led to the fourth entry of the ''Advance'' series having the rather weird title of ''Super Mario Advance 4: Super Mario Bros. 3''. Thankfully, they didn't use the full title of ''Yoshi's Island'', dropping the ''Super Mario World 2'' portion to make room for ''Super Mario Advance 3'' instead.
* The attract sequence of ''Real Bout VideoGame/FatalFury 2: The Newcomers'' markets it as the "[=7th=] Episode of ''Fatal Fury''", the previous ones being ''Fatal Fury: King of Fighters'' (first), ''Fatal Fury 2'' (second), ''Fatal Fury Special'' (third), ''Fatal Fury 3: Road to the Final Victory'' (fourth), ''Real Bout Fatal Fury'' (fifth) and ''Real Bout Fatal Fury Special'' (sixth). Out of these seven games, only ''Fatal Fury Special'' was an upgraded version of the previous game (''Fatal Fury 2''). The original ''Real Bout Fatal Fury'' carries over the character roster from ''Fatal Fury 3'', but has a completely different combat system than the one used in previous games, while ''Real Bout Special'' and ''Real Bout 2'' are each substantially different from the last as well. The pattern seems to be that numbered sequels were focused on introducing new characters, while the "''Special''" entries [[DreamMatchGame brought back previously retired characters]]. But then along came ''Garou: Mark of the Wolves'' and wiped the whole slate clean by bringing back only Terry Bogard. Between ''Real Bout 2'' and ''Garou'', there was also ''Fatal Fury: Wild Ambition'', a [[BroadStrokes retelling]] of the original ''Fatal Fury'' with the addition of characters from later titles (plus two newcomers and [[VideoGame/ArtOfFighting Ryo Sakazaki]], "returning" from ''Special'', as [[LegacyCharacter Mr. Karate II]]), and ''Fatal Fury: 1st Contact'', a portable version of ''Real Bout 2'' for the NeoGeoPocket Color.
* The ''VideoGame/{{MOTHER}}'' series is straightforward enough... in Japan. ''Outside'' of Japan, ''MOTHER 2'' is the first game released, as ''VideoGame/{{Earthbound}}''. However, the first ''VideoGame/{{MOTHER|1}}'' game was initially considered for release in the United States, and a nearly-finished prototype to this end, titled "''Earth Bound''", was found in the late 1990s. For the purposes of keeping things straight, this English version of the game is commonly referred to as "''Earthbound Zero''". Averted with ''VideoGame/{{MOTHER 3}}'', however; very few places call it ''Earthbound 2'', and pretty much everyone calls it by its Japanese title. ([[NoExportForYou Not even being considered for localization probably helped matters there.]])
* ''VideoGame/GuiltyGear'' started off simple enough, with the first game, and then ''X'' and ''XX'' ([[CapcomSequelStagnation and the latter's many retoolings]]). But then ''Guilty Gear XX Accent Core Plus'' ended up being a plot-wise sequel, and then there was ''Guilty Gear 2: Overture'', and all the ''X'' and ''XX'' games were declared to be {{Gaiden Game}}s (albeit in-canon Gaiden Games). Fair enough, but then came the next game in the main continuity: ''Guilty Gear Xrd''.
* The first installment of From Software's first-person dungeon crawler series ''[[VideoGame/KingsField King's Field]]'' was only released in Japan, being a launch game for the original [=PlayStation=] over there. As a result, ''King's Field II'' dropped the numeral for its western release, while ''King's Field III'' was renumbered ''King's Field II''. The fourth entry [[StoppedNumberingSequels avoided this whole numbering conundrum]] somewhat by being titled ''King's Field: The Ancient City'' in the U.S. (it was still titled ''King's Field IV'' in Japan and Europe).
* The fifth entry of Tecmo's ''VideoGame/{{Deception}}'' series is titled ''Deception IV: Blood Ties''. This is due to the fact that the fourth game in the series was released in the U.S. under the title of ''Trapt'', which is actually the second game in the ''Kagero'' sub-series in Japan (between ''Kagero: Deception II'' and ''Deception IV'').
* The webgame ''WesternAnimation/ShaunTheSheep: Home Sheep Home'' had a sequel, with the same basic gameplay but slightly different graphics and more of a story, called ''Home Sheep Home 2: A Little Bit Epic: Lost in London''. The following two games, having the same graphics, were apparently seen more as {{Expansion Pack}}s to the second game, so they were also called ''Home Sheep Home 2: A Little Bit Epic'', with the [[ColonCancer third subtitles]] being ''Lost Underground'' and ''Lost in Space''.
* The German version of ''VideoGame/CommandAndConquerRedAlert'' was explicitly dubbed the second part of the series (it was actually a {{prequel}}, later retconned into something distinct, or whatever). Then [[VideoGame/CommandAndConquerTiberianSun the actual sequel to the first game]] was released as part three. They stopped renumbering the games after that, and consequently released ''VideoGame/CommandAndConquerTiberiumWars'' as part three, too (but the public wasn't confused as everybody knew what the deal was by that point thanks to TheInternet).
* The original ''ClockTower'' was never released outside Japan, so when ''Clock Tower 2'' for the PlayStation was localized, [[SequelFirst they dropped the "2" from the title.]] The later ''Clock Tower II: The Struggle Within'' is actually a spinoff originally titled ''Clock Tower: Ghost Head'', which at least allowed ''Clock Tower 3'' to retained its numbering for its worldwide release.

* The ''VisualNovel/CorpseParty'' series suffers from this. You have the original game, now known as ''VideoGame/CorpsePartyPC98'', and its remakes, which completely revamp the storyline and add the subtitles ''Blood Covered'' and ''[[ColonCancer Blood Covered... Repeated Fear]]''. There's also a [[FanSequel Fan]] {{Prequel}} to PC-98 called ''VisualNovel/CorpsePartyZero''. ''Blood Covered... Repeated Fear'' got a sequel called ''Book of Shadows'', the final chapter of which provides the title for its upcoming direct sequel, ''Blood Drive''. There's also ''Corpse Party 2U'', a DenserAndWackier side game. Now, even though ''Blood Drive'' has yet to be released, ''another'' sequel set some time '''after''' that called ''VisualNovel/CorpseParty2DeadPatient'' is already out, and ''it'' gets a proper number because it's centered on an entirely different cast while being set in the same universe. ''Whew''.

[[folder:Web Original]]
* Discussed in WebVideo/TheAngryVideoGameNerd's video "[[ Chronologically Confused about Movie and Video Game Sequels]]"
** Also served as the basis for an episode of sister series YouKnowWhatsBullshit.

* Apple's iPhone. First we have the iPhone, which is followed by the iPhone 3G, named so because of its 3G network capabilities. Back in 2008 (and still today), people (used to) ask whether there was an iPhone 2G. Since the original iPhone ran on 2G networks, some referred to it as the [[FanNickname iPhone 2G]]. The iPhone 3G was followed by the iPhone 3GS, a phone nearly identical to the iPhone 3G in terms of design, but with a better camera and processor (The "S" stands for speed.). Logically, a lot of people thought the next iPhone would run on 4G networks, and thus would be called the 4G. The next iPhone did not have such functionality, though. Instead, it was named the iPhone 4, since it was the [[NumberedSequels fourth version of the iPhone Apple produced]]. Logically again, people inferred that the next iPhone would be called the iPhone 5. Wrong again! It's the iPhone 4S, without 4G capabilities (unless you count AT&T's experimental HSPA+ as 4G). Apple's next phone (at long last, with 4G LTE capabilities) was then named the iPhone 5... [[FridgeLogic despite being Apple's sixth-generation iPhone]]. What will the next phone be called, people wondered. 5G? 5S? 6? The next iPhone actually WAS called the 5S, but it was released alongside another iPhone -- The 5C. The next iteration was the comparatively sane 6 and 6 Plus.