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Simply put: when a 2D original's transition to a 3D turns out to be difficult, usually because a VideoGame3DLeap often requires more skill and talent than some developers have.

There are two aspects of dimensionality when it comes to games. A game can be rendered in 2D or 3D, and the gameplay can be 2D or 3D. All 4 combinations have been seen.
Switching from one of these combinations to another, especially going from 2D/2D to 3D/3D is fraught with peril. Particularly in the early days of 3D rendering, art styles that were painstakingly developed in 2D could be lost in the transition to 3D rendering due to lack of hardware capable of bringing it to life in 3D. And of course, there are some art styles that simply don't work in 3 dimensions at all.

Gameplay offers some very perplexing challenges too. A direct adaptation of 2D gameplay into 3D gamespaces can cause things like the dreaded CameraScrew. 3D gameplay, by necessity of both viewpoint and larger gamespace, needs to take things a bit slower than their 2D cousins.

Then, there's the version where developers forgot about trying to port the 2D gameplay into a 3D world, and just use 3D gameplay that is not entirely unlike what the 2D gameplay had. Freedom overload can ensue, where developers become so enamored with building a gigantic world that they forget to actually put interesting things into it. Puzzles that would have been simpler in a 2D game can become exceedingly complicated because of the changed viewpoint.

Oddly enough, for [=RPGs=] and adventure games, 3D rendering once was much more limiting than 2D. Consider a set of shelves with miscellaneous bottles on it. In 2D, this is part of the background; it costs comparatively little. In 3D, each bottle must have polygons, which means the quality of that bookshelf goes way down. You only get so many polygons per frame, so they should be spent on actual characters. Some games tried to cheat by using 3D backgrounds but computationally cheap sprites for the actual objects; this seldom resulted in a pleasant experience to the eye.

Add to this the lack of tilemapping: a common 2D technique for reusing images. Through tilemapping, it was possible for designers to create large terrain, with stuff in it, fairly easily. The time to develop one area would be pretty much the same as any other. You couldn't do that with 3D in the early days; every room had to be hand-built from scratch. You could reuse textures, maybe certain decorations (chairs, tables, etc), but that's about it: the basic blocking of each area had to be done from scratch.

What you get is that some games that had large 2D worlds seemed to get compressed in their 3D outings. This isn't as much a problem nowadays, but in the early days of 3D rendering, it was pretty widespread.

Be aware though, sometimes good 3D video-game adaptations are accused of this, mainly because the [[TheyChangedItNowItSucks fans don't like to see their original product change]]. Notice that very similar games with no 2D predecessors were often well received.

On the other hand, when this trope was common, not being in 3D could also invoke ItsTheSameNowItSucks among fans, so some game producers [[MortonsFork didn't have a real choice but to try]].

Do not confuse with TheyChangedItNowItSucks, which is about the ''reception'' of such games.

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!!Examples:

[[AC:ActionGame]]
* ''VideoGame/BlasterMaster'' made its only journey into the third dimension with the PlayStation game ''Blaster Master: Blasting Again''. While some of the spirit of the 2D games was preserved in the transition, the presentation took a serious hit, and the hero and his vehicle became harder to control. The next installment, the prequel/spinoff game ''Blaster Master Overdrive'', went back to 2D graphics.
* ''VideoGame/{{Bomberman}}'' hit the Polygon Ceiling a bit harshly with the ''[[{{Nintendo64}} 64]]'' series. They later tried again when the Gamecube rolled around and broke through the ceiling just fine with ''VideoGame/BombermanGeneration'' and ''VideoGame/BombermanJetters'', having made the smart move of giving only the single-player mode 3D gameplay while keeping the multiplayer the same as with the 2D games. It's a pity, though... they could have paved the way for a ''lot'' of [[IncrediblyLamePun remarks]] about why he's called Bomberman.

[[AC:AdventureGame]]
* {{Adventure Game}}s, generally speaking, have not dealt with the transition to the 3D era well (TelltaleGames' games being an exception), as they usually require ''a lot'' more attention to detail than your average FPS, platformer or what have you. Rarely will players need to explore too much or pay attention to ''everything'' in a run-and-gun shooter, whereas an adventure can easily require one to, for instance, look behind furniture, under objects, or to search ''everywhere'' for that one missing piece of the puzzle. The difference in developing time and resources was rather significant - though it's gotten less so nowadays, due to procedural generation making creation easier and a much higher detail requirement in most other game types equalizing things.
* After an extremely successful run with ''VideoGame/GabrielKnight'', the series went through two separate clashes with this trope. The first sequel had full-motion-video ''gameplay'' in a 2D environment, while ''VideoGame/GabrielKnight 3'' went into 3D. While both sequels had strong storylines, they were very difficult to play.
** Jane Jensen later said that they did not foresee the amount of details (and work) a full 3D game required. For her future projects she would prefer a 2D game on pre-rendered 3D backgrounds it would look good enough while being much cheaper.
%%* ''[[VideoGame/KingsQuestMaskOfEternity King's Quest 8]]'' was the FranchiseKiller.
* ''VideoGame/TheLegendOfKyrandia'' 1 and 2 were widely praised, while the 3rd got a mixed reception. Transition from painted to rendered backgrounds and objects was not the main peeve, but it definitely [[TheyChangedItNowItSucks affected the game atmosphere]]. The primitivism of models also did not help.
* Dialogs in ''VideoGame/StarControl 2'' used bright-colored low-resolution[[note]]about half of a 320x200 screen[[/note]] still pictures with a bit of animation. That seemed adequate. ''Star Control 3'' upgraded that to [[RealIsBrown dim]] higher-resolution[[note]]up to 640x480[[/note]] videos with compression artifacts. The animatronic puppets were intended to look like a more realistic 3D, but instead [[http://www.mobygames.com/game/dos/star-control-3/screenshots/gameShotId,4821/ Spathi]] looked like a flayed carcass, [[http://www.youtube.com/watch?v=RGwRDMr-IKw Pkunk]] looked like a sock puppet and [[http://mx.utabby.com/v?i=hH57VFpUGj8 humanoids]] went to UncannyValley.
* The {{Nintendo 64}} ''Franchise/{{Castlevania}}'' games are pretty much the poster boy of this trope for the entire series. True they did make a few more on {{Playstation 2}}, but ask any fan and he'll tell you the series only truly shines in 2-D and point you in the direction of ''VideoGame/CastlevaniaSymphonyOfTheNight''.

[[AC:FightingGame]]
* There are two key aspects to the Polygon Ceiling here. First, the 3-D gameplay is usually slower than its 2-D counterpart, making the games less dynamic (something required for a fighting game). Second, the projectiles, which are a key element of 2-D fighters, hardly ever work effectively in 3-D.
* ''Franchise/StreetFighter'', originally had stumbled into 3-D gameplay with its non-canon ''VideoGame/StreetFighterEX'' line (especially and most specifically ''[=EX3=]''), which had very mixed reactions. They later fixed things with the "2.5D" ''VideoGame/StreetFighterIV'', which utilizes 3-D graphics but retains the 2-D gameplay mechanics, the result being well-received, and reviving the fighting game genre in the process. Because of the successful 2.5D approach of [=SFIV=], Capcom later pulled the same 2.5-D move when it was time to bring ''CapcomVsWhatever'' from the SpritePolygonMix of ''VideoGame/MarvelVsCapcom2'' and ''[[SNKVsCapcom Capcom vs. SNK 2]]'' to the full 3-D of ''VideoGame/TatsunokoVsCapcom'' and ''VideoGame/MarvelVsCapcom3''.
* ''Franchise/MortalKombat'' is particularly guilty of this, with the gameplay and fatality systems being rebuilt with almost every new game.
** ''VideoGame/MortalKombat4'' was a weird case. Even when it was fully 3-D, the gameplay was not greatly altered from the previous games (with only one limited way to move on the Z-Axis), making it very faithful to the original 2-D games.
** The following games ''Deadly Alliance'', ''Deception'' and ''Armageddon'' varied in quality but were said to be somewhat decent.
** For ''Special Forces'', it probably doesn't help that the creative team behind it (including series co-creator John Tobias) quit Midway [[{{Pun}} midway]] through development, thereafter the remaining brood rushed it to development.
** With the release of ''MortalKombat 9'', they've gone back to the series' roots with 2.5D gameplay a la ''Street Fighter IV''.
* ''OneMustFall Battlegrounds'' attempted to do jump to 3D but failed due to many functionality problems. It was one of the most promising games ever made, but the bugs, lack of pilot/robot progress, inability to go through the arenas fast and awkward controls made for a big disappointment.
* ''VideoGame/TheKingOfFighters'' got around this with a "2.5D" subseries a la ''SFIV'' (in fact, predating it), the ''Maximum Impact'' line. For those who still aren't comfortable with the idea, it is explicitly an AlternateContinuity; the main games still use sprites. In a strange inversion, ''KOF XII'', which is sprite-based, proceeded to bomb. One of the reasons is how they scaled back on everything - half of the roster had been cut, and the main gameplay mode was nothing more than a glorified time trial.
** Came back with a vengeance with ''KOF XIII'' which rectified the previous games shortcomings and added some new modes.
* [[http://insomnia.ac/commentary/domination_101/2d_vs_3d/ This article]] by Seth Killian, who would later become Capcom's [[PromotedFanboy adviser for all things Street Fighter]], pretty much explains why 2D has remained viable in the face of 3D.

[[AC:FirstPersonShooter]]
* ''VideoGame/{{Blood}}'' hit the ceiling hard with the with release of ''Blood II: The Chosen'', which traded the first game's sprite-based 3D Build Engine for the full-3D [=LithTech engine=]. The game was rushed out to compete with the likes of ''VideoGame/HalfLife1'' and ''VideoGame/{{Unreal}}'', resulting in an ObviousBeta. On top of that, many felt the second game lacked the feel that made the first game fun.
* The {{System Shock}} games hit this ceiling in regards to the visuals. The original used a 2D "pseudo-3D" engine that was so advanced for 1994 that a major reason the game bombed was because most people couldn't run it at a playable framerate. The sequel went the opposite way (due to both rushed development and an attempt to make it playable for everybody) and used the dated Dark Engine, resulting in the game looking notoriously ugly, with its blocky polygons and blurry textures occasionally managing to get beat out by the original's crisp, detailed 2D environment despite coming out ''five years later''. Compare them: [[http://www.mobygames.com/images/shots/l/3396-system-shock-dos-screenshot-a-corridor-leading-to-the-central.gif SS1]] and [[http://www.visualwalkthroughs.com/systemshock2/where/8.jpg SS2]].
** Note that this only applies to the visuals. Gameplay-wise, they're both regarded as classics.

[[AC:PlatformGame]]
* 3D ''Franchise/SonicTheHedgehog'' games are typically accused of suffering from UnexpectedGameplayChange syndrome (''VideoGame/SonicAdventure'', ''VideoGame/SonicAdventure2'', ''VideoGame/SonicUnleashed'') and/or being too unpolished (''VideoGame/SonicHeroes'', ''[[VideoGame/SonicTheHedgehog2006 Sonic 2006]]'', ''VideoGame/SonicLostWorld''). In 2010 and 2011 respectively, Creator/{{SEGA}} released what ''most'' consider to be successful 3D Sonic games in ''VideoGame/SonicColors'' and ''VideoGame/SonicGenerations'', both of which kept the well-received daytime stages from Unleashed (though both games featured large amounts of 2D stages).
* ''VideoGame/EarthwormJim'' fell victim to this trope heavily, as it abandoned almost all of the gameplay elements (not to mention many of the series' characters) in its jump to 3-D. It also didn't help that the series creator, DougTennapel, was completely excluded from its development.
* ''VideoGame/{{Bubsy}}'' [[FranchiseKiller utterly splattered against the Polygon Ceiling]] with the release of Bubsy 3D, in which the entire game looked entirely unfinished and had a very restrictive control scheme. This was especially awkward considering the platforming success of SuperMario64, which was released several months before.
* While ''PrinceOfPersia 3D'' was not as well received as its predecessors, the Sands of Time reboot was widely regarded as a classic.
* [[InvertedTrope Inverted]] with the crossover games ''VideoGame/SpyroOrangeTheCortexConspiracy'' and ''VideoGame/CrashBandicootPurpleRiptosRampage'', whose [[Franchise/SpyroTheDragon source]] [[Franchise/CrashBandicoot franchises]] were originally 3D platformers but were made 2D, resulting in a widely-disliked pair of games.
* The ''Franchise/MegaMan'' franchise has made two runs at the Polygon Ceiling so far. The ''VideoGame/MegaManLegends'' series was a BaseBreaker, looking clunky and featuring gameplay that was Mega Man InNameOnly. ''VideoGame/MegaManX7'' looked gorgeous and played closer to Mega Man games, but sorta screwed up the gameplay; levels switched between true 3D and a more familiar 2.5D, and both had their own set of odd perspective and balance issues. Capcom dropped the 3D segments for ''[[VideoGame/MegaManX8 X8]]'', leaving ''X7'' an OddballInTheSeries.
* ''BionicCommando'' ran into this with the 2009 sequel. The following game, ''Rearmed 2'', returned to 2D gameplay.
[[AC:PuzzleGame]]
* ''VideoGame/{{Lemmings}} 3D''. ''Lemmings Revolution'' kept the 3D graphics, but reverted to 2D gameplay.
* Parodied in one minigame in ''WesternAnimation/LooneyTunes Duck Amuck'', where WesternAnimation/DaffyDuck wants to be in a really advanced game "with graphics up the wazoo", and becomes a very blocky collection of polygons.

[[AC:RealTimeStrategy]]
* Poor {{Stronghold}}, once Firefly had to start making 3D RTS games, it started to show very obvious problems that had gone worse with each sequel.

[[AC:RolePlayingGame]]
* ''DawnOfMana'' already deviated from formula by turning a successful 2-D action-RPG into an 3-D action-platformer with minimal RPGElements. It went on to have [[CameraScrew one of the worst camera systems]] for a [=PS2=] platformer, and mission-objective arrows that pointed directly at solid walls. It also [[LevelDrain stripped you of all your upgrades at the end of a level]], making what few RPGElements it had entirely pointless.
* The first eight ''MightAndMagic'' games used sprites for NPC's, monsters, trees, etc (in a 3D world in 6 thru 8) and were quite good. ''M&M 9'' was fully rendered. It was also full of bugs, had ridiculous looking characters with flat faces, trees with a few 'blades' of leaves, and a UI with a fraction of the functions of its predecessors.

[[AC:ShootEmUp]]
* The nearly-forgotten ''[[{{Gradius}} Solar Assault Gradius]]''. It's a perfectly fine game, but it's arcade-only and hard to play using emulators. All subsequent entries in the ''{{Gradius}}'' series went back to 2-D.

[[AC:SportsGame]]
* ''BackyardSports'' in 3D has downright ''blocky'' models.
* After a licensing dispute, ''Acclaim'' grabbed the ''NBAJam'' name from MidwayGames and made ''NBA Jam Extreme''. ''Extreme'' suffered from long load times, blocky character models, and painful overuse of the word "extreme." It added two changes to the formula established by the original ''Jam'': First of all, players no longer caught fire, but became "Smokin'", which could be achieved either by scoring three straight baskets without the opponent scoring or blocking three straight baskets. If the player did both, he became "Unstoppable." The second change was the addition of an "Extreme" button, which was even stronger than Turbo, but drained the Turbo meter twice as fast. Neither did much to change the gameplay. Now, ''Extreme'' is barely remembered, if at all.

[[AC:TurnBasedStrategy]]
* While the 3D ''VideoGame/{{Worms}}'' games definitely have their fans, general consensus is that they were inferior to the originals, and Team 17 responded in kind by returning to 2D only after Worms Mayhem.

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