* AssPull:
** Classic Tails randomly shows up out of nowhere without any explanation after you finish the battle after Death Egg Robot/Big Arm. Of course, it's explained from WordOfGod that they were unable to make a cutscene with Classic Tails' first appearance, due to time constraints.
** Blaze, who lives in AnotherDimension, somehow came over to Sonic's dimension for his birthday without any explanation. No one questions this, either.
* AuthorsSavingThrow: The finale of the game established once and for all, in-canon, that Dr. Eggman's real name is still Dr. Ivo Robotnik, intended to curb the fandom debates about which of them was his real name or not. The good doctor humorously notes this when addressed as his real name by Tails, saying [[LampshadeHanging "Nobody calls me that anymore."]]
* SugarWiki/AwesomeMusic: [[AwesomeMusic/SonicTheHedgehog It has its own section on this page.]]
* BaseBreaker: [[TheBusCameBack A large number of the supporting cast returning]]. Some people complained about it and said it ruined the game ([[FanDumb despite the confirmation that they're just NPCs coming at the same time]]), the people [[JustifiedTrope pointing out that it makes sense]] and that the people complaining that are [[MisaimedFandom forgetting that the game is]] [[MilestoneCelebration celebrating 20 years of the]] [[VideoGameLongRunners Sonic franchise]], and the people that have been waiting for those characters to make a reappearance in a main Sonic title.
* BestLevelEver: This game was pretty much meant to reimagine some of the series' best levels ever.
* BreatherLevel: [[VideoGame/SonicUnleashed Rooftop Run]], sandwiched in between [[BadFuture Crisis]] [[LethalLavaLand City]] and [[EternalEngine Planet]] [[MarathonLevel Wisp]].[[note]]The main stages, at least...[[/note]]
* BrokenBase: As with ''VideoGame/SonicUnleashed'' and ''VideoGame/SonicColors'', fans will often argue over which version is the "superior" version of the game.
** The entire game itself can qualify with fans claiming that its a good game despite its [[ExcusePlot obvious lack of a plot]], while others claim that the lack of one really drags it down. That said, in a rarity for Sonic fans, the general consensus is that the game itself is solid, with its only glaring flaw being the plot.(Or lack therof)
* DisappointingLastLevel: The Final Boss fight in the HD version has received its share of criticism, with the primary complaints centering around the visual design being very confusing and overall vagueness about how to beat it.
** This isn't limited to the final boss. The last part of the game has levels that take a huge spike in difficulty, and both Classic and Modern Sonic have to drag themselves through really [[MarathonLevel long levels at the end.]]
** Whereas most levels are actually expanded upon, making them more grand and interesting, it can be said that Planet Wisp (the last proper level before the final boss) suffers from the opposite. Wherein VideoGame/SonicColors most stages had two to three different Wisp powers on average, each stage (Classic or Modern) only uses a single Wisp power-up. If that's not bad enough, the levels are also some of the [[MarathonLevel longest in the game]], making sure to overuse the gimmick Wisp power well before you reach the end.
* EightPointEight/[[HePannedItNowHeSucks They Panned It Now They Suck]]: Game Informer's review for ''Sonic Generations'' gave it a 6.75 -- equal to ''[[VideoGame/SonicTheHedgehog2006 Sonic 2006]]''. And the main reason for this was because the reviewer wanted to [[FanDumb bitch about]] [[HateDumb how the stages from the newer games]] and the presence of newer characters made the game suck regardless of actual gameplay. This only cemented Game Informer as one of the most vocal outlets for the ''Sonic'' HateDumb.
** One [[http://youtu.be/jqOssrGoVYY?t=26m50s YouTube reviewer]] even went so far as to call Game Informer out on their biased opinions in the middle of his own review.
** While IGN's review gave the game a fairly good score otherwise, the reviewer going out of his way to pan the music accompanying Modern Sonic's stages and questioning those who ''do'' like it caused a significant amount of backlash regardless.
* SugarWiki/FunnyMoments: [[Funny/SonicGenerations It has its own page.]]
* GameBreaker: [[http://www.youtube.com/watch?v=H4E2EbU0GGg The Spin Dash for Classic Sonic from the first demo.]] Or his Spin Dash overall.
** There are several others which are mostly context specific. For example, Classic's Flame Shield skill neuters almost every obstacle and enemy in his Crisis City level aside from bottomless pits, and the jump dash you get from it has ridiculous range. Classic's Homing Attack is also pretty intense because it removes the challenge in trying to aim for an enemy to bounce on to reach higher places.
*** The Homing Attack does have one obvious drawback, though: you don't obtain the same forward momentum you would by doing a regular Spin Jump. Relying on Homing Attack might result in you missing a higher route due to not having enough air.
* SugarWiki/HeartwarmingMoments: [[http://www.sonicstadium.org/wp-content/uploads/2011/08/Sonic-Generations-Picnic-Screenshot.jpg This image, showing his fellow supporting cast celebrating his birthday.]]
** Right at the end of the credits, the 20th Anniversary badge comes up, and the voice of a crowd of people yells "Happy Birthday, Sonic!". The voices? It ''is'' the voice of the fans; it's a combination of 2 recordings from the ''Sonic Boom'' and ''Summer of Sonic'' events from the same year!
* HilariousInHindsight:
** Remember the [[http://www.youtube.com/watch?v=ZxXycBv3Rlk 3D recreation of Mushroom Hill on YouTube?]] [[http://www.youtube.com/watch?v=pe8LoLwlJ_M Sega now did it for real!]]
** The composers took one too many cues from [[OverclockedRemix Malicious]] [[http://www.youtube.com/watch?v=pPJ-XwR3RhQ Fingers]] for the [[VideoGame/Sonic3AndKnuckles Big Arm boss battle]] [[http://www.youtube.com/watch?v=qWMxoqlKX30&hd=1 theme]].
** The Japan-exclusive pre-order compilation [=CDs=] for the game are titled "History of the First Stage" (White Edition for the [=PS360=] version, Blue Edition for the 3DS). Guess what the level selection for the 3DS version primarily consists of.
** Shadow being fought in Radical Highway instead of outside Space Colony ARK in the 3DS version of the game [[FridgeBrilliance suddenly makes a whole lot more sense]] once you remember that, instead of referencing the final boss of the Hero side of ''VideoGame/SonicAdventure2'', recreates that game's ''intro movie'' instead (an OffscreenMomentOfAwesome until now). That, alongside technical limitations and the fact that Radical Highway is also the level where you play as Shadow for the first time ''in the entire series'', completely [[JustifiedTrope justifies]] the trope.
* HollywoodPudgy: In-universe, Knuckles asks the Classic Sonic if he gained weight. This causes Classic Sonic to sadly rub his round stomach.
* IKnewIt:
** Tony Harnell announced back in February 2011 a new version of "Escape from the City" was made. A couple months later, it's used for Modern Sonic's City Escape.
** [[spoiler:Classic Dr. Eggman teams up with Modern Dr. Eggman. Further, Classic Tails calls him Dr. Robotnik, but he says that nobody uses that name anymore.]]
* MemeticMutation:
** The games very ''existence'' has spawned a minor meme called "X Generations", where other series are put into a similar concept to this game, including {{Mario}}, MyLittlePony and even LooneyTunes.
** Silver's giant trash ball has been compared to ''VideoGame/KatamariDamacy''.
** On the Sonic Stadium Message Boards, [[VideoGame/SonicUnleashed Rooftop Run]] has received [[SarcasmMode some flak]] for having a tree on its rooftop, meant to mock the sentiments that the FanDumb usually have. [[http://img4.imageshack.us/img4/8532/25888010150212137766673.jpg A tree on a rooftop!?]] It's been ruined forever!
** Prior to the release of the game: [[WesternAnimation/{{Futurama}} SHUT UP AND TAKE MY]] [[ItMakesSenseInContext RINGS!]] and any variation of it.
** It's often joked or speculated that the Time Eater is the personification of the ''[[BrokenBase Sonic]]'' [[BrokenBase Fanbase.]]
*** It was also joked that Time Eater's true identity was the infamous barrel platform from ''[[VideoGame/Sonic3AndKnuckles Sonic 3]]''. A trap that is very well known for eating up time.
** A joke that spawned from Modern Sonic's final line ("[[spoiler:Enjoy your future, it's going to be great!]]") is to accompany it with any variant of [[spoiler:Modern Sonic warning his past self afterwards that [[VideoGame/SonicHeroes 2004]], [[VideoGame/SonicTheHedgehog2006 2006]], and [[VideoGame/SonicUnleashed 2008]] are going to be rough years, or a GilliganCut of Classic Sonic going through said rough years]].
** ↑ & ↓ & ↻ (The music for Speed Highway includes the repeating line "Up and down and all around;" the meme itself coming from the original Speed Highway from ''VideoGame/SonicAdventure''.)
** From the battle with the final boss, [[spoiler:[[http://www.youtube.com/watch?v=AvhbjjeTWIU "That looks like a homing shot!"]] "Be careful, Sonic!", and all variations thereof.]]
** "'''DAT VIOLIN!'''" for the fantastic remixes of Crisis City and Rooftop Run.
** Classic Rooftop Run is frequently used in mashup remixes, effectively becoming this game's most popular track.
** Like all of Eggman's repetitive quotes in battles, "Time for a change of pace!" is quite popular in parts of the ''Sonic'' fanbase.
** "You've got thi''sss''onic!" from Shadow.
** [[spoiler:That tornado's carrying [[AscendedMeme a goalpost!]]]]
* SugarWiki/MomentOfAwesome: [[Awesome/SonicGenerations Has its own page here.]]
* MostAnnoyingSound: "[[VideoGame/SonicUnleashed Time for a CHANGE of PACE!]]" Eggman will say this damn phrase constantly in the Egg Dragoon boss battle. Grinding on the rails so you can get to Eggman? Pace change. Getting OFF the rails? Thou pace hath changed. Spawns the wall-jumping part of the sidescroll fight? Change of pace.
** MostWonderfulSound: Eggman's German voice, on the other hand, is just plain awesome. [[WordOfGod Even the producers stated Hartmut Neugebauer is the perfect voice for him out of all the different language versions]]. Of course this being the first Sonic game fully voiced in German (and other European languages) means almost every time a character opens his mouth it's a MostWonderfulSound...
** Sonic's friends during the Time Eater battle. The worst part probably being that, while they talk constantly, none of them seem to think it'd be smart to say something ''helpful'' until the last attack on the boss, which is the only part that tells you what to do anyway. So while you're sitting there pressing buttons to figure out what they do, they're all standing there telling you that "It looks like a homing shot!" over and over and over again.
* PolishedPort: The PC version, which reduced the loading times ''significantly''.
** The PC version's popularity is also due to the [[GameMod modding possibilities...]]
** Unfortunately, the PC version does not have the ability to play the original ''VideoGame/SonicTheHedgehog''.
* RescuedFromTheScrappyHeap: [[VideoGame/SonicTheHedgehog2006 Silver the Hedgehog]]. He goes from being one of the cheapest and most aggravating boss fights in the series back in his debut, to this game, where he gets a very enjoyable rival boss fight with a considerable amount of {{HSQ}}. Basically, what [[VideoGame/SonicTheHedgehog2006 Sonic '06]] did for Shadow, Sonic Generations did for Silver.
** Crisis City. While it was certainly one of the more acclaimed stages in ''VideoGame/SonicTheHedgehog2006'', it's definitely a LOT more fun in this game. The physics and engine in the Modern stage are far superior to the original, and it even provides some fantastic level design in its Classic stage.
* ScrappyMechanic: Black holes, during versus matches in the 3DS version. There's a reason this is the only instance this gameplay gimmick appears.
* StopHelpingMe: [[ExpositionFairy Omochao]]. Thankfully, the main menu contains the option to turn it off.
** The same can not be said of the rest of the cast in the final battle. It most certainly does not help that the final battle is also ThatOneBoss.
--> '''Voice #1:''' It looks like a homing shot!
--> '''Voice #2:''' Be careful Sonic!
** What makes them even more annoying is that, the ''one'' hint you really need, namely "aim at the core and boost" gets drowned out by a dozen repetitions of "that looks like a homing shot".
** Equally useless is the final instruction, which if misinterpreted will be played over and over for eternity:
--> '''Tails:''' Sonic! Press L1 and R1 at the same time to combine your powers! [[spoiler: ("And hold them" would have been useful 20 minutes ago, Tails.)]]
* TaintedByThePreview: After the level list was leaked, some fans were disappointed by the lack of variety between them. [[spoiler:At least, until it was shown that some levels will be radically different from the originals.]] Takashi Iizuka saying that the 3DS version will ignore levels from the GameGear [[SonicTheHedgehogChaos spin]][[SonicTheHedgehogTripleTrouble offs]] didn't help much either.
** The 3DS version in general is detested by a large portion of the fanbase, mostly because Classic Sonic seems to have ''[[VideoGame/SonicTheHedgehog4 Sonic 4]]'' physics, Modern Sonic levels are purely 2.5D, the classic levels for the Classic Era have the exact same layout as the games they're from, the graphics aren't very good for a 3DS game, it has less levels than its console counterparts, the stages chosen almost entirely ignore the handheld history of the franchise, all the stages are first stages in some fashion except Casino Night and [[VideoGame/SonicRushSeries Water Palace]][[note]]Green Hill was the first stage in ''Sonic 1'', Mushroom Hill was the first stage in ''Sonic & Knuckles'', Emerald Coast was the first stage in ''Sonic Adventure'', Radical Highway was the first Shadow stage in ''Sonic Adventure 2'', and Tropical Resort was the first level in ''Sonic Colors''.[[/note]], and so on.
** The reveals of [[BaseBreaker Shadow]] and [[TheScrappy Silver]] as boss battles. [[spoiler:Then it turned out that both Rival battles were incredibly fun to play, and have been a considerable boon to the popularity of the characters ever since, particularly Silver's.]]
** The Death Egg Robot has been subject to claims of ItsEasySoItSucks, though it ''[[JustifiedTrope is]]'' the first[[labelnote:*]]arguably second, if one counts the Metal Sonic rival battle as a complete boss fight[[/labelnote]] proper boss in the game. Big Arm also was subject to this, also having been nerfed from its ''Sonic 3'' appearance.
* ThatOneBoss: The Time Eater. Awkward controls, lack of clarity on what exactly to do, a cluttered screen, the standard ring-draining mechanic as the rest of the series, and [[ArsonMurderAndJaywalking Sonic's friends never shutting up]]. On the other hand, the battle on the 3DS version is much easier.
* ThatOneLevel: [[VideoGame/SonicTheHedgehog2006 Crisis City]] for being much more punishing and unforgiving towards mistakes [[DifficultySpike than the previous levels]], as pointed out by fans and many reviews. [[spoiler:The tornado stealing the goal post in Act 1 doesn't help.]]
** [[VideoGame/SonicColors Planet Wisp]] Act 1 is also this for many people, for a combination of its [[MarathonLevel incredible length]] and the clunky mechanics of the Pink Spike Wisp. Not the best of combinations. Act 2 also gets this, but not quite as badly, as the Orange Rocket Wisp is devoid of any control issues the former has.
* TheyChangedItNowItSucks: A few people have been complaining that Sky Sanctuary [[FanDumb isn't yellow enough]].
* TheyWastedAPerfectlyGoodCharacter: No Classic Amy or Knuckles, despite being prominent characters from before the ArtShift. There's no Modern Metal Sonic either, despite him being the only other villain besides Eggman to be prominent before and after the ArtShift.
* TheyWastedAPerfectlyGoodPlot: Many fans feel the plot was too thin, the linking between events could have been done better, and had many missed opportunities regarding character interaction and more nudges or references to previous games in the series. This is especially true after the [[SonicAdventure2 two]] [[SonicTheHedgehog2006 previous]] anniversary games had far more engaging plots. Although the latter is generally considered not very good either, but this is the YMMV tab.
* VillainDecay: [[spoiler:Subverted:]] Eggman is once again overpowered by the MonsterOfTheWeek, two times, after the Death Egg Robot boss and the Egg Dragoon boss, but only ''after'' his defeats at Sonic's hands have left him vulnerable. [[spoiler:And then [[TheReveal it's revealed prior to the final boss]] that Eggman discovered the Time Eater after the events of ''VideoGame/SonicColors'' and teamed up with his past self to tame it, leading to the Eggmen putting the events of the game in motion.]]
* {{Woolseyism}}: Dr. Eggman's Western name of Dr. Ivo Robotnik which was incorporated as the character real/birth name to make the transition to the original Japanese name Dr. Eggman as his nickname/alias, was [[LampshadeHanging lampshaded by Classic Eggman himself, who derisively tongue-in-cheek notes that nobody calls him that (Robotnik) anymore.]]


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