* Video game example, kind of: The entire fourth installment of the original seven-part (six-part?) ''VideoGame/LeisureSuitLarry'' series was never made, largely because lead designer Al Lowe couldn't figure out how to logically continue the series from the third game on and chose to skip straight to the fifth one. Its nonexistence is a major plot point in the fifth game and it pops up in other series by the same company, never playable.
** Another explanation is that ''Larry 4'' was originally going to be a massively multiplayer online adventure game (in the early nineties!), but development never got off the ground as modem technology was still much too primitive at the time, so in the end the small minigames that were used to beta-test the project's online capabilities were packaged together and sold as ''The Sierra Network''.
*** Leisure Suit Larry 4 turns up as a gag/plot point in ''VideoGame/SpaceQuest 4''. [[spoiler:Vohaul smuggled his consciousness onto a disk of Leisure Suit Larry 4, and the Xenonian scientists are so eager to play it that they load it into the planet-controlling supercomputer.]] When you're in Vohaul's lair later in the game, one of the programs on his computer is "[=LSL4=]."
** Legend has it that Al Lowe had intended to end the series with 3 and thus once said that "there won't be a [=LSL4=]". [[ExactWords Well... there isn't.]]
* ''VideoGame/StarFox2'', was never released, even though the Japanese version was practically completed. The plot would have continued the story from the previous game, and would have introduced Star Wolf as major antagonists. The game was canceled most likely due to the pending release of the Nintendo 64. Shortly after the game's termination, ''VideoGame/StarFox64'' began development, and rebooted the storyline from scratch. Eventually the ROM was leaked to the internet, and an English FanTranslation was released.
* Many computer games, after their initial publishing run, suffer from a problem somewhat unique to the medium. As ScienceMarchesOn, it can be quite rewarding to produce a VideoGameRemake or UpdatedRerelease especially designed for newer computers, except that the source code and other assets of many commercial games are rarely held onto. For example, when the ''[=xu4=]'' and ''[=Exult=]'' projects wanted to make source ports of ''{{Ultima}} IV'' and ''VII'', Origin admitted that it had lost everything. And when ''VideoGame/{{Fallout Tactics|BrotherhoodOfSteel}}'' was under development just a few years after the previous ''VideoGame/{{Fallout}}'' game had been released, it turned out that virtually all of the original game's [=3D=] assets had been lost, and nearly all of it ended up being remodeled.
* Speaking of ''Fallout'', there's [[VideoGame/FalloutVanBuren the original sequel]] to ''VideoGame/{{Fallout 2}}'' made by Black Isle, code-named "[[http://fallout.wikia.com/wiki/Van_Buren Van Buren]]", which was about 85% done when Black Isle's parent company Interplay went bankrupt and the game was never seen again. ''VideoGame/{{Fallout 3}}'' was eventually made five years afterwards by Creator/{{Bethesda}}, yet had nothing to do with Van Buren.
** ''VideoGame/FalloutNewVegas'', however, does reference several concepts that would have been part of Van Buren, specifically Caesar's Legion, the Van Grafs and Hoover Dam. It's no coincidence that [[Creator/ObsidianEntertainment the development team for New Vegas]] was comprised of many former members of Black Isle.
** ''Ultima X: Odyssey'': It was canceled just four months after EA shut down Origin.
* Many games that [[NoExportForYou don't make it overseas]] are this to the foreign fans of a series who are cursed with hearing people who actually did get it talk about it, but will never play it themselves. If they're lucky, it's an old game that will get a FanTranslation. If not, they're screwed.
* The [[UltraSuperDeathGoreFestChainsawer3000 excessively violent and knowingly offensive]] ''VideoGame/ThrillKill'' was pulled from distribution before it could offend, likely to avoid fears of a [[MurderSimulators moral outcry]], and because AO-rated games are not allowed on consoles. The game developers were [[CreatorBacklash rightfully annoyed]] by this; leaking a beta version of the game before releasing another fighting game, ''Wu-Tang: Shaolin Style'' using the same game mechanics, albeit marginally toned-down (i.e., LESS bloody and gory).
* Several {{Amiga}} magazines were sent review copies of ''Putty Squad'', and even the hardliners at ''Magazine/AmigaPower'' graded it 91%--but the Amiga port never publicly surfaced beyond a coverdisk demo. Only an {{SNES}} version was published.
* The fourth game in Creator/{{Atari}}'s ''Swordquest'' series, ''Airworld'', was never developed, probably due to TheGreatVideoGameCrashOf1983. One of Parker Brothers' ''Film/ReturnOfTheJedi'' games also never made it past the concept art stage (the other unreleased game, ''Ewok Adventure'', was discovered as a prototype).
* Similar to the Leisure Suit Larry example above, there was an installment of ''SamAndMaxFreelancePolice'' made called ''Sam & Max: Freelance Police!!''. However, LucasArts cancelled it and it wouldn't be until another two years before Telltale Games would make a Sam & Max game. Like [=LSL=] above, the game is referenced in the Telltale Games series as a "particularly gruesome case".
** The gruesomeness (and bitterness) around the LucasArts sequel is that the game was ''finished and already rated by the ESRB'', before being caught up in the studio's decision to leave the adventure game business entirely.
* The reason why many Sega Saturn classics like ''VideoGame/PanzerDragoon'' Saga and ''VideoGame/ShiningForceIII'' have never been re-released is because Sega lost the original programming code for the games. Same for their System-16 (and then some) arcade games.
** Speaking of which, a 1990 Tokyo Toy Show tech demo of the original ''VideoGame/SonicTheHedgehog'' (which was the very first glimpse of the game and also the first time the game could be played by the public) can also considered as this due to a similar situation (the original ROM for the tech demo was lost internally at Sega).
** There's also the infamous ''VideoGame/SonicXtreme''.
* Yet another "lost video game": Despite what many fans believe, the ''WesternAnimation/TinyToonAdventures'' video game ''Defenders of the Universe'' never got past development stage. Dialogue and graphics were already produced at that time but Creator/{{Treasure}} simply terminated the project because publisher Conspiracy continuously held off the release date from 2001 all the way up to the spring of 2002, had it been finished. According to rumors, Conspiracy had major financial troubles that led them to pushing the release date numerous times, as well as terminating many of their other planned products. The company told Treasure that "business complications" was the reason they had to wait. It was not until eight years later when an image of a prototype version was shown, and still it looked incomplete (even though the ESRB already reviewed the game at the time of termination, possibly citing that the game was ''almost'' complete). Another project, ''Scary Dreams'', was released the same year, but only in Europe (North America did not acknowledge that game's existence until ''three years later'').
* This happens ''constantly'' with embedded online games (mostly Flash nowadays, but some older ones used Shockwave)
** Anything that was on Bonus.com in the late '90s/early 2000s, since the site is now defunct and most of the media on it (mostly games but some stories too) were endemic to it.
** Millsberry was an advertisement game for General Mills. It ran for 6 years but shut down in 2010.
* The ''VideoGame/SuperMarioWorld'' [[GameMod romhack]] ''Notte Luminosa'' was taken down from SMW Central after it was revealed that the creator lied about having terminal cancer, in an attempt to get other people to make LetsPlays of the game.
* The Eyewitness series of educational video games has one of these, if it ever was made. There is an Eyewitness Virtual Reality Shark game referenced to in the others, but no physical copies exist. Not even torrents. It's likely that this one game never was made.
* There's actually quite a lot of VideoGame/SuperMarioWorld [[GameMod rom hacks]] that fall into this. Some examples include anything from before the time SMW Central was 'hacked' and wiped clean six or so years ago, any resources use in the Japanese hacks Ore World 2 and The Mario (since the authors websites have vanished along with their asm and code), anything from the first VIP 5 uploader (taken down because people used it for things other than VIP 5 submissions), anything from the original Japanese hack hosting/submission site (which vanished without a trace a few years back) and Super Mario World Freedomn since the author's website has been taken down.
* Many user-uploaded cities and components such as buildings and maps of past ''VideoGame/SimCity'' games like 2000 and 3000 (the first with an Internet component) have been lost as fan sites compiling those city files for others to play have shut down, bought by larger media companies that didn't care about those archives, or corrupted during site upgrades.
* This happens to most [=MMOs=] once they shut down.
** ''VideoGame/TheSims Online'' has been lost, but there have been attempts to restore it. The original attempt failed due to EA sending a cease-and-desist letter to the developers, but there are others trying with different engines.
** ''WesternAnimation/FostersHomeForImaginaryFriends'' once had an MMO type game called "Big Fat Awesome House Party". By the time it ended in 2009, it had over 13 million users.
* ''Mire Mare'', the fifth ''VideoGame/SabreMan'' game, was never made, despite being mentioned by name in the ending of ''Underwurlde''.
* ''Franchise/MetalGear'':
** There was a ''Metal Gear Solid'' port for the very unpopular Tiger Electronics [=Game.com=] console that was never released due to Konami being unhappy with the market performance of the platform (although some of its resources, code and level design found its way into ''VideoGame/MetalGearGhostBabel'').
** ''VideoGame/MetalGearSolid2'':
*** Original plans for the game was for it to be called ''Metal Gear Solid III'', to reinforce the game's censorship/editing of sequences theme (where did the missing ''II'' go?). This was soon abandoned, but early (internal) trailers still refer to it by this name.
*** There is a large and expensive chunk of that was modelled, animated, acted and complete, but cut from the game at the last minute [[TooSoon as the 9/11 terror attacks happened towards the end of development]] (the scenes depicted Arsenal Gear laying waste to various New York landmarks). The model of the ruined New York and several of the props and character models used in the sequence can be looked at on the ''Documents of [=MGS2=]'' disc, which also presents the script of the sequence; and the novelisation (released in the 2010s) retains this sequence - however, the section itself remains in the Konami vault and no footage of it has ever been shown.
** ''VideoGame/MetalGearSolidMobile'', an award-winning {{Interquel}} set between ''VideoGame/MetalGearSolid'' 1 and 2 with a whole new plot and game mechanics, was released just before touch-screen phones became the new thing, and thus was immediately rendered incompatible with everything. Since it was only available for digital download from companies that have now shut down and since phones of that era are impossible to emulate for various reasons, obtaining and playing it is almost impossible, even with piracy - only the [=NGage=] version is available on illegal channels and it requires a cracked [=NGage=] to play (a discontinued and highly unpopular piece of hardware that goes for hundreds even second hand). There are a few hacker groups working on it, but it's not likely to happen. It doesn't help that it was only available in Japan and to people using Verizon phones in America - so [[NoExportForYou many people in Europe thoroughly missed out]].
** ''Piece Walker'', a rather enjoyable promotional game for ''VideoGame/MetalGearSolidPeaceWalker'' where you compete with another player to complete jigsaws, is down from the website and can no longer be played. It has not been released again in any form.
* Similar to the ''Panzer Dragoon Saga'' example above, the GameBoyAdvance version of ''Mega Man Anniversary Collection'' was cancelled because Capcom lost the original code for the original GameBoy Mega Man games and proved too expensive to rebuild them.
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