A sequel number snarl 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. Basically, this happens when the [[NumberedSequels numbering of sequels]] gets really, ''really'' complicated.

A subtrope of NumberedSequels. See also ColonCancer. If the numbering doesn't start with 1, but is otherwise logical, see NPlusOneSequelTitle. If it's chapters within a single work that are numbered oddly, that's UnusualChapterNumbers.



[[folder:Card Games]]
* ''TabletopGame/MagicTheGathering'' started numbering its core sets by 4th edition, the fifth set after Alpha, Beta, Unlimited and Revised, by counting Alpha and Beta as the first and second versions of the Limited Edition. 'Classic' 6th Edition was the first base set to use an expansion set symbol on the cards; prior sets were identified by print quality, border size/color and date. Numbering continued until 2007's 10th edition (10E), then started yearly numbering in 2009 with Magic 2010 (M10), the date of each set being a year ahead of the set's release year, up until 2014's Magic 2015. The last core set is stated to be Magic Origins, a 2015 unnumbered set with a sunrise symbol and the set code ORI.

* ''The Comicbook/IncredibleHulk'' was originally canceled after six issues. After appearing in various other mags and becoming more popular, the Hulk was given a new solo feature in the ''Tales to Astonish'' anthology. When Marvel finally found a better distributor, ''The Incredible Hulk'' became its own mag again, but it neither started over with a new #1 nor did it continue the original numbering, it continued that of ''Tales of Astonish'', with #102. This resulted in confusion over whether the revival should be considered a resumption of the original series or a second volume – Marvel's Web site uses the former interpretation while their trade collections prefer the latter.

[[folder:Films -- Live-Action]]
* ''Literature/TheRing'':
** A 1995 film, named ''Ring'' and re-released 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 ''Film/TheRingTwo''.
** Korean film ''The Ring Virus''.
* The ''Franchise/{{Rambo}}'' series goes ''Film/FirstBlood'', ''Film/RamboFirstBloodPartII'', ''Film/RamboIII'', and then ''Film/{{Rambo|IV}}'' (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/Dawn of the Dead|1978}}'' was dubbed under the title of ''Zombi'', spawning two sequels produced by Creator/LucioFulci (who was responsible for the Italian dub): ''Film/{{Zombi 2}}'' and ''Film/Zombi3D''. 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'' (a.k.a. ''Zombie 5''). In the UK, all four of these movies were released under the title ''Zombie Flesh Eaters'' title and were numbered appropriately.

* ''Literature/TheChroniclesOfNarnia'' started out in chronological order but the [[Literature/TheHorseAndHisBoy fifth]] and [[Literature/TheMagiciansNephew sixth]] books were, respectively, a {{interquel}} and a {{prequel}}. Later editions of the series number the books in chronological order, but many fans maintain that reading them in publication order is more rewarding because the prequel contains [[CallForward references that only make sense if you've read the other books first]]. As for Creator/CSLewis himself, he never really cared about the order in which people read his books.
* The books of ''Literarture/LorienLegacies''. We present you (with the actual order in parentheses):
** ''I Am Number Four'' (actually the first);
** ''The Power of Six'' (actually the second);
** ''The Rise of Nine'' (actually the third);
** ''The Fall of Five'' (actually the fourth);
** ''The Revenge of Seven'' (actually the fifth);
** ''The Fate of Ten'' (actually the sixth);
** ''United as One'' (actually the seventh; or the last). Over here, we've already lost it.
* The numbering of the books in the ''Literature/{{Relativity}}'' series is straightforward until you get to book 7. At that point, the storyline [[SimultaneousArcs splits off in two directions,]] with the two different paths referred to as "Book 7" and "Book 7½". Also, the first book of side stories is logically called "Relativity Side Stories Book 1", but its original title was "Relativity Book 4½". For bonus confusion it was released [[OutOfOrder one week]] ''[[OutOfOrder prior]]'' [[OutOfOrder to Book 4.]]

[[folder:Live-Action TV]]
* ''Franchise/PowerRangers'':
** ''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.
** Years later, part of [[Series/MightyMorphinPowerRangers the first season]] was ReCut and presented as a new season in itself. Officially, it was Season 18, but fans were reluctant to name glorified reruns as a full season and generally considered the following span of ''new'' episodes, ''Series/PowerRangersSamurai'', as the actual Season 18. Within a few years, official sources followed suit and ignored the ReCut in official season counts.
** Beginning with ''Series/PowerRangersSamurai'', franchise installments began being stretched over two years, with the second year of each having an updated NewSeasonNewName, leaving fans unsure whether to count each as one two-year season or two one-year seasons. ''Series/PowerRangersMegaforce'' complicates things further since each of its two years adapts a ''different'' ''Franchise/SuperSentai'' series while the others adapt just one series for the duration.
* ''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 quite confusing. Does Nu Who start again, which means distinguishing between two Season Ones? (Wiki/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? (Wiki/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.
** Interestingly, this has been introduced in-universe with the Doctor themself. Originally, when regeneration was introduced, it wasn't stated that William Hartnell's character was in fact the First Doctor. The Fourth Doctor episode "The Brain of Morbius" has a scene indicating prior regenerations. However, it was later firmly established that the First Doctor was the original incarnation. Then comes "The Name of the Doctor" and "The Day of the Doctor", which introduced a new regeneration between 8 and 9. It was stated that the Doctor doesn't consider the War Doctor to be worthy of the title, so he doesn't count in the numbering. Add in "Time of the Doctor", which stated that Ten's aborted regeneration actually counted, and you have a situation where the current, Twelfth Doctor could technically be considered the Fourteenth.
*** Played for laughs in a cinema prelude to Twelve's debut, where Strax notes that the numbering of Doctor gets "tricky" as you go on.
-->'''Strax:''' The Eleventh Doctor...possibly the Twelfth. Technically, the Thirteenth! Who can say?
*** The Doctor herself gets around the whole business by counting personalities and regenerations separately. X Doctors, one incarnation who didn't claim the title, one extra regeneration burned.

* 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 Music/GeorgeHarrison songs, as a supposed Vol. 2.
* Music/{{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.

* UsefulNotes/MicrosoftWindows. Internal and external version numbers haven't matched in years. Part of this complexity stems from the different versions being entirely different code bases over the years. Earlier versions were based on the old MS-DOS system (indeed, Windows was originally an add-on program to DOS, not an operating system). This applies to every version up to and including the 95/98/Me versions (DOS-based Windows 4.x, internally). Meanwhile, the NT code base was introduced as a high-end, network-friendly system, released in parallel and aimed at businesses. The ''first'' version of that was NT 3.1 (the same version number DOS-based Windows was on at the time; the user interface of NT 3.1 looked and functioned just like the DOS version). NT 4.0 was released at the same time as Win 95 (and looked just like it, despite not being internally compatible). It wasn't until Windows XP (NT version 5.0) was released that the home and business lines were fully merged. Vista was NT 6.0, but when it went over like a lead balloon, they intentionally pushed the external number up to 7, while the internal system number was 6.1, as the core internals are only slightly tweaked; Windows 7 was mostly a user-end overhaul. Windows 8 followed, again overhauling the user-end stuff, so it's internal number is 6.2; it was even more criticized than Vista (because 7 actually was popular and not too old), so a patch job called 8.1 was released, making the internal number 6.3. For the follow up, they wanted to show a big jump, so they skipped the name straight to Windows 10. [[strike:But it's just 6.4 internally!]] Surprisingly, the build number is also 10--specifically 10.0.10240 for the RTM release.

[[folder:Tabletop Games]]
* The various ''TabletopGame/DungeonsAndDragons'' editions are titled ''Dungeons & Dragons'', ''Dungeons & Dragons Basic Set'', ''Advanced Dungeons & Dragons'', ''Advanced Dungeons & Dragons 2nd Edition'', ''Dungeons & Dragons 3rd Edition'', ''Dungeons & Dragons v3.5'' (a minor revision), ''Dungeons & Dragons 4th Edition'' (plus its {{Retool}} ''Essentials'', which isn't counted as a new edition), and ''Dungeons & Dragons 5th Edition''. While the relationships between early versions isn't hard and fast (they were considered the same game, just aimed at different audiences, and were largely compatible until the Basic Set was revised in 1981), there's no way 5th Edition is actually the 5th version of the game.
* The RPG ''TabletopGames/RuneQuest'' was originally published by {{Creator/Chaosium}} in 1978. A slightly revised 2nd edition was published not too long after. An expanded 3rd edition was released in 1983, developed by Chaosium but published by Creator/AvalonHill as part of a deal that gave AH ownership of the name (an aspect of the deal everyone later said was a big mistake). So far straightforward, as each edition was just numbered, and fans and creators called them [=RQ1=], [=RQ2=], and [=RQ3=] respectively.\\\
Then things went off the rails, as Avalon Hill mismanaged the line, and the game went stagnant for some years, as Chaosium didn't have the rights to the name anymore to make a new edition. Eventually Chaosium founder Greg Stafford left management of the company, taking the rights to the Glorantha setting (which he created) with him. ''Stafford'', not Chaosium, was the one to reacquire the ''[=RuneQuest=]'' name from Avalon Hill (which had been itself bought by {{Creator/Hasbro}}). He licensed the name to Mongoose Publishing, which finally released a new edition, simply titled ''[=RuneQuest=]'' like prior editions, in 2006, though they couldn't use the previous ''texts'' as a base, as Chaosium still owned that, and had to rewrite it as close to the previous editions as they could. When a revised edition was released four years later, Mongoose titled it ''[=RuneQuest II=]'', not to be confused with the ''actual'' second edition from the early 80s. These became known as "[=MRQI=]" and "[=MRQII=]", respectively. Mongoose lost the license just a year later, but the lead authors of [=MRQII=] picked it up and through a new company released a 6th edition, [=RQ6=] for short, which was really just a director's cut of [=MRQII=].\\\
Re-enter Chaosium. Or more accurately, re-enter Greg Stafford to Chaosium. Although he had left management of it years before, Stafford still was a major owner of the company, and when it ran into financial trouble, he re-took control, which reunited ''RuneQuest'' with its original publisher. A new edition was announced (despite the relative newness of the 6th edition). During development they initially referred to it as "[=RQ4=]", as it's the fourth edition written by Chaosium, but it's the seventh overall (and ignoring the editions between was seen as something of an insult to their authors), so they dropped that. The full title of the new edition is ''RuneQuest: Roleplaying in Glorantha'', which they abbreviate as "[=RQG=]". Just so happens that "G" is the 7th letter of the alphabet, so at least it's the right position. So the whole edition order goes: [=RQ1=], [=RQ2=], [=RQ3=], [=MRQI=], [=MRQII=], [=RQ6=], [=RQG=].

[[folder:Video Games]]
* ''Adventure Quiz: Capcom World'' was followed by ''Adventure Quiz 2: Hatena? no Daibōken'', the handheld game ''Capcom Quiz: Hatena? no Daibouken'', and ''Adventure Quiz: Capcom World 2'', making the sequel the third game or fourth game if counting the handheld game.
* ''VideoGame/DragonSlayer'' includes:
** ''Dragon Slayer'', the first game of the ''Dragon Slayer'' series.
** ''VideoGame/DragonSlayerIIXanadu'', the second game of the ''Dragon Slayer'' series, and the first game of the the ''Xanadu'' series, followed by ''Xanadu Scenario II'', ''VideoGame/{{Faxanadu}}'', ''The Legend of Xanadu'', ''The Legend of Xanadu II: The Last Dragon Slayer'', ''Xanadu Next'' and ''Tokyo Xanadu''.
** ''Dragon Slayer Jr: Romancia'', the third game.
** ''Dragon Slayer IV: Drasle Family'', the fourth game, known as ''VideoGame/LegacyOfTheWizard''.
** ''Dragon Slayer V: Sorcerian'', with add-ons ''Sorcerian Utility Vol. 1'', ''Sorcerian Additional Scenario Vol. 1'', ''Sorcerian Additional Scenario Vol. 2 – Sengoku Sorcerian'', ''Sorcerian Additional Scenario Vol. 3 – Pyramid Sorcerian'', ''Sorcerian New Scenario Vol. 1 – The Visitor from Outer Space'', ''Selected Sorcerian 1'', ''Selected Sorcerian 2'', ''Selected Sorcerian 3'', ''Selected Sorcerian 4'', ''Selected Sorcerian 5'', and ''Gilgamesh Sorcerian''.
** ''Dragon Slayer: The Legend of Heroes'': The sixth ''Dragon Slayer'' game, and the first game of ''[[VideoGame/KisekiSeries The Legend of Heroes]]''.
** ''Lord Monarch'': Real-time strategy spinoff, considered the seventh ''Dragon Slayer'' game.
** ''Dragon Slayer: The Legend of Heroes II'': The eighth ''Dragon Slayer'' game, second in ''The Legend of Heroes'' series. Did not have an English release.
** ''The Legend of Heroes'' drops ''Dragon Slayer'' from the title, and continues with ''The Legend of Heroes III: Shiroki Majo'', ''The Legend of Heroes IV: Akai Shizuku'', and ''The Legend of Heroes V: Umi no Oriuta''. The localized titles are ''The Legend of Heroes II: Prophecy of the Moonlight Witch'', ''The Legend of Heroes: A Tear of Vermillion'', and ''The Legend of Heroes III: Song of the Ocean''.
** The sixth entry in ''The Legend of Heroes'' consists of ''The Legend of Heroes: Sora no Kiseki First Chapter'', ''The Legend of Heroes: Sora no Kiseki Second Chapter'', and ''The Legend of Heroes: Sora no Kiseki The 3rd'', the first two localized as ''The Legend of Heroes: Trails in the Sky'' and ''The Legend of Heroes: Trails in the Sky the Second Chapter''.
** The seventh entry of ''The Legend of Heroes'' is ''The Legend of Heroes: Zero no Kiseki'' and ''The Legend of Heroes: Ao no Kiseki'', not localized into English.
** The eighth entry in ''The Legend of Heroes'' consists of ''The Legend of Heroes: Sen no Kiseki'', ''The Legend of Heroes: Sen no Kiseki II'', and ''The Legend of Heroes: Sen no Kiseki III'', the first two to be localized as ''The Legend of Heroes: Trails of Cold Steel'' and ''The Legend of Heroes: Trails of Cold Steel II''.
** ''Nayuta no Kiseki'': An action spinoff in the same universe as ''The Legend of Heroes'', not part of the main series.
* ''VideoGame/PacMan2TheNewAdventures'' is more like the tenth ''VideoGame/PacMan'' sequel.
* ''Franchise/SilentHill'' had three {{numbered sequels}}, 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 [[VideoGame/{{Metroid 1}} original]] and ''[[VideoGame/MetroidIIReturnOfSamus Return of Samus]]''. But then the ''Prime'' series was a runaway success, [[VideoGame/MetroidPrimeTrilogy creating two sequels and three 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'':
** The release order of the main games in the series are: ''VideoGame/StreetFighterI'', to ''VideoGame/StreetFighterII'', to ''VideoGame/StreetFighterAlpha'' and then ''Alpha 2'', to ''VideoGame/StreetFighterIII'', to ''Street Fighter III 2nd Impact'', to ''Alpha 3'', to ''Street Fighter III 3rd Strike'', to ''VideoGame/StreetFighterIV'', then ''VideoGame/StreetFighterV''. Chronologically, it's ''I''-''Alpha 2-Alpha 3''-''II''-''IV''-''V''-''2nd Impact''-''3rd Strike''.[[note]]In the case of the original ''Alpha'' and ''III'', they're [[BroadStrokes overwritten]] by the events of ''Alpha 2'' and ''2nd Impact''.[[/note]]
** The ''VideoGame/StreetFighterEX'' series is a [[TwoAndAHalfD polygonal]] offshoot of ''VideoGame/StreetFighterII''. In terms of plot, the original game was intended to be a sidestory set during the events of ''II''.[[note]]Its WorkingTitle was even "''Street Fighter {{Gaiden|Game}}''".[[/note]] However, since the series was developed by Arika, who own the rights to the new characters introduced in the series, it evolved into [[AlternateContinuity its own continuity instead]].
* ''Franchise/FinalFantasy'':
** ''VideoGame/FinalFantasyIV'' was originally released in America as ''II'', and ''VideoGame/FinalFantasyVI'' as ''III''. Synchronizing the sequels as of ''VII'' confused Americans briefly, but the numbering has caught on. The UsefulNotes/VirtualConsole releases of ''Final Fantasy IV'' and ''VI'' in America, being straight emulation of the SNES versions, kept the earlier Americanized numbering, although there were already ports of those game for the UsefulNotes/PlayStation and UsefulNotes/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. As though to confuse things further, it came in three parts (''[[VideoGame/StarCraftIIWingsOfLiberty Wings Of Liberty]]'', ''[[VideoGame/StarCraftIIHeartOfTheSwarm Heart of the Swarm]]'' and ''[[VideoGame/StarCraftIILegacyOfTheVoid Legacy Of The Void]]''), and it's difficult to know whether to consider each of them separate video games or expansion packs or what.
* Similarly, the ''VideoGame/{{Homeworld}}'' franchise consists of ''Homeworld'' (1999), ''Homeworld: Cataclysm'' (2000), ''Homeworld 2'' (2003), and the prequel ''Homeworld: Deserts of Kharak'' (2016), originally announced as ''Homeworld: Shipbreakers''.
* ''VideoGame/CallOfDuty'' had its fourth game named ''Call of Duty 4: VideoGame/ModernWarfare''. Its sequels are named ''Call of Duty: Modern Warfare 2'' and ''Call of Duty: Modern Warfare 3''. Then there's ''VideoGame/CallOfDutyBlackOps'', which went off on its own sequel-numbering scheme on top of being sequels to ''World at War''. Everything else that's not ''Black Ops'' since then - ''[[VideoGame/CallOfDutyGhosts Ghosts]]'', ''[[VideoGame/CallOfDutyAdvancedWarfare Advanced Warfare]]'', and ''[[VideoGame/CallOfDutyInfiniteWarfare Infinite Warfare]]'' - [[StoppedNumberingSequels hasn't bothered with numbers]] because none of them follow on from another game's story.
* 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 NeatherRealm Studio]] 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, "[[https://twitter.com/noobde/status/365589415143276544 Mortal Kombat 10: We Lost Count"]]). And one could be easily forgiven for mistaking ''[[VideoGame/MortalKombatDeadlyAlliance Deadly Alliance]]'', ''[[VideoGame/MortalKombatDeception Deception]]'', and ''[[VideoGame/MortalKombatArmageddon 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'' (although, that's as in the letter "X", not the Roman numeral for 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.
* ''VideoGame/AceCombat'':
** The 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]]'' ([[EpisodeZeroTheBeginning prequel to the entire series]] and, more specifically, ''5''), ''[[VideoGame/AceCombatXSkiesOfDeception X]]'' (released before ''6'' but set after it), ''Xi'' ({{interquel}} [[HeroOfAnotherStory to]] ''X''), and ''[[VideoGame/AceCombatJointAssault X2]]'' (which was eventually stripped of the "number" because it had nothing to do with ''X'' except the [[Usefulotes/PlayStationPortable platform]]). Thankfully, [[Creator/BandaiNamcoEntertainment Namco]] StoppedNumberingSequels at ''VideoGame/AceCombatAssaultHorizon'', in part because, like ''X2/Joint Assault'', [[AlternateContinuity that game is set in a different continuity from the numbered games]].
** Following ''Assault Horizon'', Project Aces would release ''[[VideoGame/AceCombatAssaultHorizonLegacy Assault Horizon Legacy]]'' (which actually has nothing to do with ''Assault Horizon'', being a [[VideoGameRemake remake]] of ''2'' that better ties the game into the Strangereal world, hence why it's known as ''Ace Combat 3D: Cross Rumble'' [[MarketBasedTitle in Japan]]), ''[[VideoGame/AceCombatNorthernWings Northern Wings]]'' (a [[DashedPlotLine "midquel"]] [[TheGreatestStoryNeverTold spanning the events of]] ''04'', ''5'', and ''6''), and ''[[VideoGame/AceCombatInfinity Infinity]]'' (another title set in the real world instead of Strangereal [[note]]the others being ''Joint Assault/X2'' and ''Assault Horizon''[[/note]], [[MythologyGag only with elements of nearly every other preceding game in the series]] and a WholePlotReference to ''04''). Then they announced ''[[AceCombat7SkiesUnknown Ace Combat 7]]'' for the UsefulNotes/PlayStation4, bringing this trope back in full force after a brief wane.
* An OlderThanTheNES example of this is Atari's ''VideoGame/{{Sprint|2}}'' 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. ''VideoGame/{{Battlefield 1}}'' is actually the ''fifteenth'' entry in the series; the odd title choice is because the game covers the events of UsefulNotes/{{World War|I}} '''[[UsefulNotes/WorldWarI I]]'''.
* ''VideoGame/{{BEMANI}}'' games often have spinoff games between numbered versions. The smallest example of this trope is every ''VideoGame/{{beatmania}} IIDX'' game from ''beatmania IIDX 2nd Style'' onwards actually being the ''n''+1st game due to ''beatmania IIDX substream'' being released between ''1st Style'' and ''2nd Style''. Things get even more complicated with other numbered ''BEMANI'' games.
* ''Franchise/ResidentEvil'' had its first three numbered installments on the UsefulNotes/PlayStation, which were then followed by ''VideoGame/ResidentEvilCodeVeronica'' on the [[UsefulNotes/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 [[UsefulNotes/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 ''VideoGame/SuperC''). The NES games were followed by an SNES sequel titled ''VideoGame/ContraIIITheAlienWars'' and all subsequent sequels were left unnumbered until the release of ''VideoGame/{{Contra 4}}'' for the UsefulNotes/NintendoDS, which was actually the eleventh (non-port) installment in the series and an interquel set between ''Contra III'' and ''VideoGame/ContraHardCorps''. To add further confusion, ''Contra III'' was actually the fourth game released, since there was a GameBoy game titled ''Operation C'' released between ''Super C'' and ''Contra III'' (which was likely not counted since it was a portable release and they weren't typically considered part of the main series in those days). What would have been counted as part of the main series was ''Contra Force'', an NES game originally planned for release before ''The Alien Wars'', which would have been numbered IV, but between a plot that had nothing to do with the series and a production delay, ''Contra III'' got that number. 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 ''VideoGame/{{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 UsefulNotes/SegaGenesis titled ''The Revenge of Shinobi'', which featured completely different play mechanics from the arcade games (with a few elements borrowed from the UsefulNotes/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'' (a.k.a. ''Super Wonder Boy: Monster World''), ''VideoGame/WonderBoyIIIMonsterLair'', ''VideoGame/WonderBoyIIITheDragonsTrap'' (a.k.a. ''Monster World II''), ''VideoGame/WonderBoyInMonsterWorld'' (a.k.a. ''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 the titles tend to vary in Japan. The original ''Wonder Boy'' became ''Super Wonder Boy'' on the Sega Mark III since it was the second ''Wonder Boy'' port in Japan following an earlier version for the [[UsefulNotes/OtherSegaSystems SG-1000]] (Sega's very first console), while ''Wonder Boy in Monster Land'' became ''Super Wonder Boy: Monster World'' due to the existence of the similarly-titled ''Waiwai Monsterland'' for the Super Cassette Vision. Since the west never had to deal with these issues, the Master System ports simply kept the original arcade titles. The later console games in Japan simply went by the ''Monster World'' moniker.
** ''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'':
** Officially, it goes ''VideoGame/{{Sonic the Hedgehog|1}}'' (released in 1991), ''[[VideoGame/SonicTheHedgehog2 Sonic 2]]'' (1992), ''[[VideoGame/SonicTheHedgehogCD Sonic CD]]'' (1993), ''[[VideoGame/Sonic3AndKnuckles Sonic 3]]'' (1994), ''Sonic & Knuckles'' (1994) which is an [[MissionPackSequel expansion]] of ''Sonic 3'', ''[[VideoGame/SonicTheHedgehog4 Sonic 4: Episode I]]'' (2010), and then ''Sonic 4: Episode II'' (2012). There are also 8-bit versions of ''Sonic'' and ''Sonic 2'' which run separately from the more well-known 16-bit games.
** 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 UsefulNotes/GameBoyAdvance game ''VideoGame/SonicBattle''). Storylines from this series continue into the multiplatform releases of ''VideoGame/SonicHeroes'', and then further into ''VideoGame/ShadowTheHedgehog'', before releasing yet another game titled ''[[VideoGame/SonicTheHedgehog2006 Sonic the Hedgehog]]''.
** 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 UsefulNotes/GameGear.
* The first game in the ''Franchise/AssassinsCreed'' series 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. While the snarl was justified with ''Brotherhood'' and ''Revelations'' for revisiting a previous protagonist instead of presenting an all-new story, ''VideoGame/AssassinsCreedIV'' was numbered ''and'' a prequel to ''III''. Numbering fell apart for good after that. ''VideoGame/AssassinsCreedRogue'' has a new protagonist and takes place between ''IV'' and ''III''. ''VideoGame/AssassinsCreedUnity'' and ''VideoGame/AssassinsCreedSyndicate'' both have completely new protagonists and take place in new time periods but do not get numbers. Then we now have ''VideoGame/AssassinsCreedOrigins''; the tenth game in the franchise whose Assassin's story is a prequel to the rest of the games. Although if sorted by the order of the modern times framing device instead of the historical time it just follows production order.
* 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).
* The ''VideoGame/DoubleDragon'' series started as a trilogy of games on the arcade and NES (as well as other platforms) consisting of the original ''VideoGame/{{Double Dragon|I}}'', ''VideoGame/DoubleDragonIITheRevenge'' and ''Double Dragon 3: The Rosetta Stone'' (or ''Double Dragon III: The Sacred Stones'', as the third NES game, which is an entirely different game only sharing the basic plot premise, was called). It was a followed by an unnumbered sequel (actually a reboot) for the Super NES titled ''Super Double Dragon'' (a.k.a. ''Return of Double Dragon'' in Japan), which was essentially treated as the unofficial "Double Dragon IV", to the point that when U.S. publisher Tradewest decided to develop a fighting game based on the ''WesternAnimation/DoubleDragon'' animated series, they named their game ''Double Dragon V: The Shadow Falls''. An official ''VideoGame/DoubleDragonIV'' would eventually be released decades later in 2017 for [=PS4=] and PC (via Steam), which was developed by the original team and follows the continuity of the NES versions.
* ''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 UsefulNotes/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-only game, whereas ''Joe & Mac 2/3'' was strictly for the SNES). For those curious, ''Tatakae Genshijin 2'' was ''Congo's Caper''.
* ''VideoGame/GrandTheftAuto'' has a total of seven mainline entries on PC and consoles. The initial sequel was naturally ''VideoGame/GrandTheftAuto2'', which retained the top-down format of the first game. It was followed by the revolutionary ''VideoGame/GrandTheftAutoIII'', which brought the series to [=3D=] and pioneered the open-world action genre. Then came the two prequels, ''VideoGame/GrandTheftAutoViceCity'' and ''VideoGame/GrandTheftAutoSanAndreas'', which were standalone games based on the ''[=GTA III=]'' engine. For a while it was rumored that Rockstar Games were going [[StoppedNumberingSequels to drop the numbers completely]] for future sequels and simply title each game after the location they took place in. This was later proven false when the next game, ''VideoGame/GrandTheftAutoIV'', resumed the numbering from where the third entry left off. This was followed by ''VideoGame/GrandTheftAutoV'', making it the seventh mainline game. Of course, this isn't counting the few expansion packs that were made (the two London Mission Packs for the original game and ''Episodes from Liberty City'' for ''[=GTA IV=]''), nor the four portable games (with the two ''City Stories'' games, originally for [=PSP=], getting ports on [=PS2=]).
* 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), ''VideoGame/{{Doom 3}}'', ''Doom 3: Resurrection of Evil'' (an expansion of the original ''Doom 3'') and the 2016 reboot [[RecycledTitle simply titled]] ''VideoGame/{{Doom|2016}}'' (initially announced as ''Doom IV'').
* ''VideoGame/{{Gradius}}'':
** ''Gradius'', the original 1985 arcade game, released as ''Nemesis'' in North America and Europe. Ported to various home consoles. The NES version kept the ''Gradius'' name abroad, whereas the MSX version went by ''Nemesis'' in Europe.
** ''Salamander'' is probably the most confusing entry in the series. It was originally developed as a sequel to ''Gradius'', but was eventually released as a spinoff instead. There were three main arcade versions produced, the original ''Salamander'' released in Japan and Europe (Version J and D, respectively), the ''Life Force'' release in North America (Version K), which had some minimal graphical changes but was mechanically identical to the original ''Salamander'', and the Japanese release of ''Life Force'' (Version N), which completely changed the backgrounds and enemy sprites and ditched the instant power-ups with a ''Gradius''-style selection meter system. The Famicom version of ''Salamander'' was essentially a combination of the Japanese ''Salamander'' and ''Life Force'' releases, adapting the graphical style of the former and the power-up system of the latter. The Famicom version was localized as ''Life Force'' on the NES. The MSX version of ''Salamander'' is actually a completely different game set in the same continuity as the MSX ''Gradius''/''Nemesis'' trilogy. The series eventually got a stand-alone sequel for the arcade exclusively in Japan, simply titled ''Salamander 2'', in 1996.
** ''Gradius 2'', the MSX sequel to ''Gradius'', known in Europe as ''Nemesis 2''. The X68000 remake is titled ''Nemesis '90 改''.
** ''Gradius II: Gofer's Ambition '', the arcade sequel to ''Gradius'' (released overseas as ''Vulcan Venture''), followed by ''Gofer's Ambition: Episode II'' on the MSX, known in Europe as ''Nemesis 3: The Eve of Destruction''. The Famicom version is simply titled ''Gradius II'' and was never localized for the NES, unlike its predecessors.
** ''Nemesis'', the Game Boy sequel to ''Gradius''. Followed by ''Nemesis II'', known as ''Gradius: The Interstellar Assault'' and ''Nemesis II: The Return of the Hero''. Both games were re-released as ''Gradius'' and ''Gradius II'' respectively on the ''Konami Game Boy Collection''.
** ''Cosmic Wars'', turn-based strategy spinoff based on ''Gradius''.
** ''Gradius III: From Legend to Myth'', known simply as ''Gradius III'' on the Super NES. The sequel to the arcade ''Gradius II''.
** ''Gradius Gaiden'', an appropriately titled GaidenGame for the original [=PlayStation=].
** ''Solar Assault'' and ''Solar Assault Revised'', 3D rail-shooter spinoff.
** ''Gradius IV: Resurrection''. The fourth arcade game in the ''Gradius'' series.
** ''Gradius Advance'', known as ''Gradius Galaxies'', known as ''Gradius Generation'', chronologically set as an interquel between ''Gradius III'' and ''Gradius Gaiden''.
** ''Gradius V''. A sequel to ''Gradius IV'', notable for being the only mainline entry released directly to consoles without a prior arcade version.
** ''[=Gradius ReBirth=]'', UsefulNotes/WiiWare sequel.
** ''Parodius'': Parody crossover series and SpiritualSuccessor to ''Gradius''. ''Parodius: The Octopus Saves the Earth'', ''It's Parodius! From Myth to Laughter'', ''Fantastic Parodius - Pursue the Glory of the Past'', ''Jikkyō Oshaberi Parodius'', and ''Sexy Parodius''.
** ''Paro Wars'', turn-based strategy spinoff based on Parodius, and SpiritualSuccessor to ''Cosmic Wars''.
** ''Otomedius'': AlternateContinuity spinoff series. ''Otomedius'', updated as ''Otomedius G (Gorgeous!)'', and its sequel, ''Otomedius X (Excellent!)'', has no continuity with ''Gradius'', and crosses over with ''Gradius'' around the ''Gradius II''-''Gradius III'' era, making it a sequel to ''Gradius''.
* 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 installment—released well after ''The Second Encounter''—with 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 ''VideoGame/MetalGear'' series naturally started with the [[VideoGame/MetalGear1 original 1987 game]], released for the [[UsefulNotes/{{MSX}} MSX2]] computer and then ported to the NES (which was the only version released in North America). This led to the production of not one, but two ''Metal Gear'' sequels: the sequel to the NES version was titled ''VideoGame/SnakesRevenge'' and was released for the west, whereas the [=MSX2=] sequel, ''VideoGame/MetalGear2SolidSnake'', was available only in Japan. Because of this a lot of people in the west before the internet essentially thought that ''Snake's Revenge'' was the only ''Metal Gear'' sequel, to the point that it was even referred to as ''Snake's Revenge: Metal Gear II'' in magazine coverage. This subtitle has since felt into disuse as awareness of the [=MSX2=] games became more widespread through the plot summaries in the original ''VideoGame/MetalGearSolid'' and their later inclusion in most versions of ''VideoGame/MetalGearSolid3''.
** ''VideoGame/MetalGearSolid'' itself, while being a sequel to the [=MSX2=] games (rather than the more widely available NES games at the time), also served as a soft reboot for the series, as it was the first installment in [=3D=] and was the first canonical game that was given a proper worldwide release (hence why it was titled ''Metal Gear Solid'' and not ''Metal Gear 3''). Thus, subsequent mainline entries reset the numbering of the series by being titled ''VideoGame/{{Metal Gear Solid 2|Sons of Liberty}}'', ''[[VideoGame/MetalGearSolid3SnakeEater 3]]'' and ''[[MetalGearSolid4GunsOfThePatriots 4]]'' (with the third game being a prequel to the very first ''Metal Gear''). Simple enough.
** Things wouldn't get complicated again until the release of ''VideoGame/MetalGearSolidPortableOps''. Released between ''[=MGS3=]'' and ''[=MGS4=]'', it was the first ''MGS'' game to be released for a portable system that was advertised as being a mainline entry rather than a non-canon spinoff (as was the case with ''VideoGame/MetalGearGhostBabel'' and ''VideoGame/MetalGearAcid''), essentially serving as a direct sequel to ''[=MGS3=]''. Creator/HideoKojima himself only had minimal involvement with its production, as he was busy with ''[=MGS4=]'' at the time. Kojima would later write and direct the next PSP game in the series, ''VideoGame/MetalGearSolidPeaceWalker'', which also serves as a sequel to ''[=MGS3=]'', but practically ignores the events of ''Portable Ops'' outside one throwaway line. ''Peace Walker'' was even titled ''Metal Gear Solid 5'' at one point and while the numbered title was dropped from the final release, its plot would be continued in the actual ''VideoGame/MetalGearSolidV''. As a result, there's some debate whether ''Portable Ops'' or ''Peace Walker'' should count as mainline installments due to their portable origins and lack of numbering in their titles (although ''Peace Walker'' did get ported to consoles). ''Portable Ops'' in particular tend to be omitted from most of the recent timelines, with ''Peace Walker'' only being recognized due to Kojima's involvement (although that may change due to Kojima's departure from Konami).
* ''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''.
* ''Franchise/KingdomHearts'': The series features ''VideoGame/{{Kingdom Hearts|I}}'', ''VideoGame/KingdomHeartsII'', and ''VideoGame/KingdomHeartsIII'', which are all native to home consoles, feature a similar "Command Menu" gameplay style, and follow Sora, Donald and Goofy. However, the series also features a number of unnumbered side games and prequels released on a mix of handheld consoles and mobile phones (and in one case, internet browsers). They do have significant differences from the numbered games, often featuring unique gameplay and different player characters, which may explain why they don't get numbers, but this tends to confuse newcomers since the lack of a number implies that they aren't totally necessary to understand the overarching plot (they are). This naming convention has created a situation where, in release order, ''Kingdom Hearts'' is the first game, ''Kingdom Hearts II'' is the ''third'' game, and ''Kingdom Hearts III'' is the ''eleventh''.
* ''Franchise/SuperMarioBros'':
** The mainline Mario games have 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 (adapted from the Japan-exclusive ''VideoGame/DokiDokiPanic''). This was done since ''Lost Levels'' was essentially [[MissionPackSequel a level pack]] for the first game with the [[SequelDifficultySpike difficulty spiked up]], and Nintendo of America wanted a more original and less frustrating game to serve as their own version of ''Super Mario Bros. 2'' (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 would've happened had they decided to just skip ''Lost Levels'' completely without releasing a substitute game). Ultimately, both games were recursively made available in both Japan and overseas (with the former receiving ''Super Mario Bros. 2'' under the name ''Super Mario USA''), and were further canonized by the inclusion of their features in future games, so the snarl is now limited to their names.
** Strictly speaking, ''VideoGame/WarioLandSuperMarioLand3'' and ''VideoGame/SuperMarioWorld2YoshisIsland'' aren't really proper sequels of their respective predecessors, but instead [[PoorlyDisguisedPilot spin-offs]], which is why ''their'' own 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 game); meanwhile, ''Yoshi's Island'' didn't have the ''World 2'' moniker in Japan, so the full name was ''Super Mario: Yoshi's Island''.
** ''VideoGame/WarioLand'' gets another problem due to the release of ''VideoGame/VirtualBoyWarioLand'', which is actually the second game in the ''Wario Land'' series, but isn't counted amongst the numbered titles. This means that ''VideoGame/WarioLandII'', ''[[VideoGame/WarioLand3 3]]'', and ''[[VideoGame/WarioLand4 4]]'' are actually the third, fourth, and fifth games.
** The ''Super Mario Advance'' series has its own numbering system, despite the games themselves simply being GBA ports of the NES/SNES titles. The ''Advance'' games are released in no particular order: the first game is an UpdatedRerelease of the US ''VideoGame/SuperMarioBros2'', the second game is an updated rerelease of ''VideoGame/SuperMarioWorld'', the third game is an updated rerelease of ''Super Mario World 2: VideoGame/YoshisIsland'' (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), and the fourth game has the rather weird title of ''Super Mario Advance 4: VideoGame/SuperMarioBros3''.
** ''VideoGame/NewSuperMarioBros2'' is actually the third game in the ''VideoGame/NewSuperMarioBros'' series; the current pattern is that only the portable titles are numbered, while the home titles are named after the console they're on (the actual second entry is ''VideoGame/NewSuperMarioBrosWii'', released in 2009).
** ''VideoGame/MarioParty'' has the original plus nine numbered sequels, e, Advance, DS and Island Tour.
* ''VideoGame/LittleBigPlanet'' only counts the console games with numbered sequels. This means that ''[=LittleBigPlanet=] 2'' is actually the ''third'' game in the series (or fourth, if you count spinoff ''Sackboy's Prehistoric Moves''), because of the release of the PSP ''[=LittleBigPlanet=]'' in between the original [=PS3=] ''[=LittleBigPlanet=]'' and ''[=LBP2=]''. This also means that ''[=LittleBigPlanet=] 3'' can be anywhere from the fifth to the ''eighth'' game in the series ([=LBP1, LBP PSP, (Sackboy's Prehistoric Moves), LBP2, LBP Vita, (LBP Karting), (''Run Sackboy! Run!''), LBP3=]).
* 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 updated 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 UsefulNotes/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 ''MOTHER'' game was initially considered for release in the United States, and a nearly-finished prototype to this end, titled "''[=EarthBound=]''", 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''" (until its 2015 re-release as ''VideoGame/EarthBoundBeginnings''). Averted with ''VideoGame/{{MOTHER 3}}'', however; very few places call it ''[=EarthBound 2=]'', and 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 ''VideoGame/ClockTower'' was never released outside Japan, so when ''Clock Tower 2'' for the UsefulNotes/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 ''VideoGame/ClockTower3'' to retained its numbering for its worldwide release.
* ''VideoGame/TalesOfEternia'' was released in North America on the original [=PlayStation=] as ''VideoGame/TalesOfDestiny II'' due to Creator/{{Mattel}} owning the trademark for the name "Eternia" (the title remained unchanged in Europe, where it was released on the PSP). This would eventually cause a bit of confusion among fans when an actual ''Tales of Destiny 2'' was released in Japan for the [=PS2=], which was never released overseas.
* Despite consisting entirely of NumberedSequels, the continuity in ''Franchise/FiveNightsAtFreddys'' is rather confusing (and that is before you add ''FNAF World'', which is most likely in an AlternateContinuity to begin with). What we know for sure, though, is that [[spoiler: ''2'' definitely takes place before ''1'', ''4'' may be set either before ''2'' or at the same time at ''2'']], ''3'' is set after ''1'', and ''Siter Location'' is set before 3.
* [[Creator/{{Koei}} Koei Tecmo]]'s ''VideoGame/DynastyWarriors'' series has a less-severe version of ''Final Fantasy''[='s=] original problem in that the Japanese and English numbering are skewed by one. This is because the series started with a game called ''Dynasty Warriors'' that was a FightingGame under the name ''Sangoku Musou'' in Japan. The "sequel" underwent a dramatic GenreShift into the OneManArmy HackAndSlash style that is the ''Warriors'' signature and was thus titled ''Shin Sangoku Musou''. Every subsequent game in Japan has been numbered in accordance with that. However, in English territories, ''Shin Sangoku Musou'' continued the ''Dynasty Warriors'' name by being called ''Dynasty Warriors 2''. So ''Shin Sangoku Musou 2'' is ''Dynasty Warriors 3'', ''[=SSM3=]'' is ''[=DW4=]'', and so on.
* ''VideoGame/TonyHawksProSkater'' were numbered up to ''4''. The next three used subtitles instead. Then the eighth installment was called ''Project 8'', followed by four more games (plus spin-offs) without numbers. The series is capped off with a [[ObviousBeta rushed cash-in]] released in 2015 simply named ''Tony Hawk's Pro Skater 5''.
* The ''[[VideoGame/{{Soul|Series}} Soulcalibur]]'' series did not actually start with the original ''Soulcalibur'', but rather with ''Soul Edge''. However, Creator/{{Namco}} were forced to rename the {{PlayStation}} port ''Soul Blade'' [[MarketBasedTitle outside Japan]] in order to get around a trademark dispute with game designer Tim Langdell over the use of the word "Edge". As a result, when it came time to make the sequel, Namco decided to retitle the series ''Soulcalibur'' in order to avoid having two different names for the series between markets, although Langdell's ownership of the word "Edge" would later be proven fraudulent after a separate trademark dispute with Creator/ElectronicArts over ''VideoGame/MirrorsEdge''. Because of this, ''VideoGame/SoulcaliburV'' director Daishi Odashima originally wanted to title the sixth entry ''Soul Edge II'' to reflect the new direction he wanted to take with the series, but [[PublisherChosenTitle Namco wasn't having that]], likely due to the can of worms that would've opened up. The upcoming ''VideoGame/SoulcaliburVI'' doesn't help matters either; while bearing the name of a sequel, it is actually a ContinuityReboot of the series set around the time of ''Soul Edge'' and could be considered a second starting point in general.
* The ''VideoGame/GuitarHero'' and ''VideoGame/RockBand'' series have this as well. First we have ''Guitar Hero'' ''I-III'', simple. Then we have ''World Tour,'' which is counted as the official fourth game in the series. Then ''5'', yes ''5'', no Roman numerals, and ''Warriors of Rock,'' which is counted as the sixth entry in the main series. Then we have the band-centric games. The Aerosmith game was released in between ''III'' and ''World Tour'', weirdly the same year as ''World Tour,'' but built on ''III's'' engine, Metallica's game was released between ''World Tour'' and ''5'', followed by Van Halen's game. ''Then'' we have ''expansions''! ''Rocks the 80s'' was made after ''II'' but before ''III'', ''Smash Hits'' was released before ''5'' and after ''Metallica'', and ''Band Hero'' was released only a ''few months'' after ''5''. Then we have the portable games for the DS, 3 in all, and various mobile games! To say Creator/{{Activision}} milked the franchise would be an understatement. Then there's the reboot, ''Guitar Hero Live,'' which was a revamp to the series. If we were only to count the titles released to consoles, it'd be 13.
** ''Rock Band'', luckily, has a more manageable list of games. They have ''Rock Bands 1-4''. In 2009, 2 games were released in between ''2'' and ''3''; ''The Beatles: Rock Band'' and ''Lego Rock Band.'' In 2010, they released ''Green Day: Rock Band'' several months before ''3'' came out. There were also some mobile games and even track packs (which were just DLC packs put on a disc with a download code to export them to the main series), the only one of any real worth being the ''AC/DC Live'' pack, which you couldn't buy through the regular DLC store due to the band's stance on how they want their music sold. They also had ''Rock Band Blitz'' out in 2012, which is more of a revamped version of their previous ''Amplitude'' and ''Frequency'' titles that was more like the track packs, since the main songs in the game were available to get through buying it before they eventually came to the DLC store. Altogether, it's 9, with the main games, band-centric games, spin-offs, and the AC/DC track pack, not counting the mobile games.

[[folder:Visual Novels]]
* 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 direct sequel, ''Blood Drive''. There's also ''Corpse Party 2U'', a DenserAndWackier side game. Now, ''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 "[[http://www.youtube.com/watch?v=OEVzPCY2T-g Chronologically Confused about Movie and Video Game Sequels]]". Also served as the basis for an episode of sister series ''WebVideo/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... despite being Apple's sixth-generation iPhone. Apple appeared to have settled into a comparatively sane pattern by following iPhone 5 with 5S (along with 5C), 6 and 6 Plus, and 6S and 6S Plus. This trope comes back in full force in the eleventh-generation lineup: the iPhone 8, the iPhone 8 Plus, and the iPhone X (pronounced "iPhone ten")--named for the tenth anniversary of the original iPhone.
* [[UsefulNotes/ThePope Popes]] named Stephen. In 752, a priest from Rome named Stephen was elected to become pope, and would have been the second pope with that name. But he died suddenly of a stroke a couple of days later before being fully installed. Confusion exists as to whether he counts as a pope, and with it the numbering of subsequent popes named Stephen, who are either Stephen II through IX or III through X, depending on the interpretation; that numbering didn't become common until the 10th century, after most of these popes had come and gone, doesn't help. Many sources would list ''both'' numbers, showing "Stephen III (IV)", for example.
* [=Nvidia=]'s [=GeForce=] series of graphic processors starts with the [=GeForce=] 256 and then goes 2-4, FX, 6-9 before switching to hundred numbers (e.g. 100, 200, 300) and then to tens with the current [=GeForce 10=] and the upcoming [=GeForce 20=].