[[quoteright:343:http://static.tvtropes.org/pmwiki/pub/images/rsz_7sonic_w01_l_9724.jpg]]
[[caption-width-right:350:3 Eras, 2 Sonics, 1 Epic Adventure.]]
->"''Double the speed, double the fun!''\\
''Celebrate 20 years of Sonic with Sonic Generations.''"
-->-- '''Sega.com'''

''Sonic Generations'' is a main series title in the [[Franchise/SonicTheHedgehog Sonic franchise]], released in 2011 for the PlayStation3, {{Xbox 360}}, the PC (via {{Steam}}) and the Nintendo3DS to commemorate Sonic's [[MilestoneCelebration 20th Anniversary]]. The 360/[=PS3=]/PC versions of the game utilizes both 2.5D (mostly in the "Classic Sonic" sections) and a mix of 2.5D and 3D gameplay in the style of ''VideoGame/SonicColors'' Wii and ''VideoGame/SonicUnleashed'' HD's daytime stages (in the "Modern Sonic" sections), while the 3DS version's "Modern Sonic" levels are stylistically similar to the ''VideoGame/{{Sonic Rush|Series}}'' series and ''Sonic Colors'' DS. Both HD console versions and the 3DS version support stereoscopic 3D, though gamers without a 3D TV aren't required to use one to play the HD console versions as they can be played on any TV and the stereoscopic 3D on the 3DS version is not required to play the game properly and can be turned off, as it is typically used for visual effects on that version.

The story is that Modern Sonic and his friends are celebrating his birthday when a mysterious new enemy named the 'Time Eater' crashes the party and sends them back to the past, where Sonic [[MeetYourEarlyInstallmentWeirdness meets his younger self]], Classic Sonic. They both discover that the world is losing its color, [[TakenForGranite their friends]] [[AndIMustScream have been petrified]], and the timeline has been disturbed. Both Modern and Classic must team up to stop this mysterious enemy, rescue their friends, restore color to the world, and fix the timeline.

Their journey takes them through three eras: [[SegaGenesis Classic]], {{Dreamcast}}, and Modern. The 3DS and console versions have different levels, and share only the famous GreenHillZone from ''[[VideoGame/SonicTheHedgehog1 Sonic 1]]''.

The stages are:

[[foldercontrol]]

[[folder:Xbox 360/Playstation 3/PC Version]]
* [[The16BitEra Classic Era]]:
** ''[[VideoGame/SonicTheHedgehog1 Sonic 1]]'': GreenHillZone
** ''[[VideoGame/SonicTheHedgehog2 Sonic 2]]'': Chemical Plant Zone, Death Egg Zone[[labelnote:*]]The setting for the fight against the Death Egg Robot (Sonic 2's final boss)[[/labelnote]], [[CasinoPark Casino Night Zone]][[labelnote:*]]in the form of a [[DownloadableContent DLC]] [[SidetrackedByTheGoldSaucer pinball minigame]][[/labelnote]].
** ''[[VideoGame/SonicTheHedgehogCD Sonic CD]]'': Stardust Speedway (Bad Future)[[labelnote:*]]The setting for the Rival Boss Fight against Metal Sonic.[[/labelnote]]
** ''VideoGame/Sonic3AndKnuckles'': Sky Sanctuary Zone[[labelnote:*]]Which also takes design cues from Marble Garden and includes an interior section reminiscent of the Hidden Palace.[[/labelnote]]
* [[SixthGeneration Dreamcast/Adventure Era]]:
** ''VideoGame/SonicAdventure'': Speed Highway, Station Square[[labelnote:*]]The setting for the fight against Perfect Chaos (Sonic Adventure's Final Boss).[[/labelnote]]
** ''VideoGame/SonicAdventure2'': City Escape, Final Rush[[labelnote:*]]The setting for the Rival Boss Fight against Shadow.[[/labelnote]]
** ''VideoGame/SonicHeroes'': [[PalmtreePanic Seaside]] [[UnderwaterRuins Hill]][[labelnote:*]]This zone is mostly based on the following act, Ocean Palace. Act 1 also takes level design cues from [[VideoGame/Sonic3AndKnuckles Hydrocity Zone]].[[/labelnote]]
* [[SeventhGeneration Modern Era]]:
** ''VideoGame/SonicTheHedgehog2006'': [[LethalLavaLand Crisis]] [[AfterTheEnd City]][[labelnote:*]]You also fight Silver here.[[/labelnote]]
** ''VideoGame/SonicUnleashed'': Rooftop Run[[labelnote:*]]Spagonia with a festival theme. Contrary to common belief, Flying Battery is not featured.[[/labelnote]], Eggmanland[[labelnote:*]]The setting for the fight against a completed version of the Egg Dragoon (Last Boss against Dr. Eggman in Sonic Unleashed).[[/labelnote]]
** ''VideoGame/SonicColors'': [[EternalEngine Planet Wisp]][[labelnote:*]]Pink (Spike) and Orange (Rocket) Wisps appear here. Act 1 also takes level design cues from [[VideoGame/SonicTheHedgehog2 Metropolis Zone]][[/labelnote]].
[[/folder]]

[[folder:Nintendo [=3DS=] Version]]
* Classic Era:
** ''[[VideoGame/SonicTheHedgehog1 Sonic 1]]'': GreenHillZone
** ''[[VideoGame/SonicTheHedgehog2 Sonic 2]]'': Casino Night Zone[[labelnote:*]]You also race Metal Sonic here.[[/labelnote]]
** ''[[VideoGame/Sonic3AndKnuckles Sonic 3]]'': Launch Base Zone[[labelnote:*]]The setting for the Big Arm Boss Fight (Sonic 3's Final Boss).[[/labelnote]]
** ''[[VideoGame/Sonic3AndKnuckles Sonic & Knuckles]]'': Mushroom Hill Zone
* Dreamcast/Adventure Era:
** ''VideoGame/SonicAdventure'': Emerald Coast
** ''VideoGame/SonicAdventure2'': Radical Highway[[labelnote:*]]You also race Shadow here[[/labelnote]], Cannon's Core [[labelnote:*]]The setting for the Biolizard Boss Fight.[[/labelnote]]
** ''VideoGame/SonicHeroes'': Special Stages, Final Fortress[[labelnote:*]]The setting for the Egg Emperor Boss Fight.[[/labelnote]]
* Modern Era
** ''VideoGame/{{Sonic Rush|Series}}'': Water Palace
** ''VideoGame/SonicColors'': Tropical Resort[[labelnote:*]]With Red (Burst) and Cyan (Laser) Wisps returning. Also the setting for the Silver race.[[/labelnote]]
[[/folder]]

[[http://tvtropes.org/pmwiki/posts.php?discussion=13022075440A76044600 Here's where you can discuss all matters pertaining to this game.]]
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!!This game provides examples of:
* TwoAndAHalfD: Used to varying degrees. Classic Sonic's gameplay focus remains strictly on a 2D plane in a 3D environment, while Modern Sonic's gameplay uses the same formula used for ''VideoGame/SonicColors'' and ''VideoGame/SonicUnleashed'''s Daytime stages. The 3DS version is entirely in [=2.5D=], but with the ''VideoGame/{{Sonic Rush|Series}}'' feel for Modern and a platforming-focused feel of the Genesis games for Classic.
* ABirthdayNotABreak: The Time Eater crashes Sonic's birthday party in the game's opening.
* ActionCommands: By jumping off of certain ramps or through rainbow rings, Modern Sonic can perform tricks when you press in different directions. These are also used to dodge the orca's attacks in Modern Sonic's portion of Emerald Coast in the 3DS version.
* AdvancingBossOfDoom:
** The G.U.N. Truck in City Escape in the HD version. In Modern Sonicís version, it even sports giant, retractable buzz saws and jet boosters.
** The orca in [[VideoGame/SonicAdventure Emerald Coast]] in the 3DS version. Classic Sonic requires pure speed to get away from it, but Modern Sonic has to dodge its bites as well after it chases him into the air.
* AfterTheEnd: Crisis City in the HD version.
* AgelessBirthdayEpisode: Sonic is still 15.
* AlreadyMetEveryone: If you have him turned on before the game starts, Omochao meets Classic Sonic in Green Hill Zone within the prologue, implying he already knew Sonic for a while before you first get to experience him [[ExpositionFairy trying to help Sonic and his friends]] in ''VideoGame/SonicAdventure2''.
* AndIMustScream: [[spoiler:It's heavily implied that Sonic's friends are ''still self aware'' while petrified.]]
** In the epilogue, [[spoiler:two different time-period versions of Robotnik are stuck in a state of absolute ''nothing'' for what appears to be a long, long time.]]
* AntiFrustrationFeatures: In order to successfully attack [[spoiler:Perfect Chaos]], the Boost move must be used. Normally this is impossible when the boost meter is empty, but in this case it's possible no matter what.
* ArtEvolution: [[VideoGame/SonicAdventure Perfect Chaos]] has undergone a considerable redesign, looking much different than his original form. A comparison between the original and redesign can be seen [[http://images3.wikia.nocookie.net/__cb20100717010945/sonic/images/7/75/PerfectChaosSADX.PNG here]] and [[http://images1.wikia.nocookie.net/__cb20111014211207/sonic/images/6/6e/Chaos3.PNG here.]]
** Apparently, this was how he was originally intended to look; however, due to technological limitations, they were unable to do it, resulting in the Chaos from ''Sonic Adventure''. (The version seen in Sonic Generations does resemble the Perfect Chaos seen in the intro cinematic for ''Sonic Adventure'' and its ''DX'' counterparts.)
** Classic Metal Sonic seems to have undergone a minor one by contrast, since his proportions and height are much different than his original sprites or artwork for the classic games (specifically, he's much rounder and shorter), but this was probably done just to keep him proportionally identical to Classic Sonic in the game, since SonicTheHedgehog4: Episode II (which takes place directly after Metal's showdown in CD) reuses his standard design and proportions off the bat.
* AscendedMeme: A subtle one: Shadow has that [[VideoGame/ShadowTheHedgehog DAMN fourth Chaos Emerald]] as a reward for his rival fight in the HD version. (His rival fight just unlocks the boss in the 3DS version, as Chaos Emeralds are gained through Special Stages in it.)
* AttackOfThe50FootWhatever: Giant-sized Badniks appear in a mission in Green Hill. They're immune to any damage Sonic does, and are mostly used as bouncing platforms.
* AttackOfTheTownFestival: Spagonia appears to be in the middle of a festival in the HD version, with balloons and confetti and [[BreadEggsMilkSquick giant swinging axes]].
* AutoTune: The classic remix of "Escape from the City" has it, though it's [[JustifiedTrope justified]] because it's there to pay tribute to and match the pitch of the [[VideoGame/Sonic3AndKnuckles Endless Mine]] melody.
* AutomaticNewGame: Selecting "New Game" from the title menu immediately takes you to Green Hill Zone Act 1.
* AwesomeButImpractical:
** [[spoiler:Super Sonic loses rings at a faster rate than usual. The modern version can now fly through levels in a manner similar to the Chaos Control ability in ''VideoGame/ShadowTheHedgehog''. Unfortunately, doing so drains rings ridiculously fast, limiting its usefulness. Classic Super Sonic is also not that much faster (if any faster at all) than Modern Sonic.]]
** One unlockable skill for Modern Sonic, Endless Boost, [[ExactlyWhatItSaysOnTheTin provides you with a Boost Gauge that never runs out]], but also turns Sonic into a OneHitPointWonder, unable to collect any rings. Can be seen as a TakeThat at the notion that Modern Sonic gameplay is simply "boost to win".
*** This ability gets a temporary upgrade to DifficultButAwesome in Seaside Hill. In most zones, the course is surrounded by pitfalls, but the course in this zone is surrounded by water, which Sonic can run across by boosting. This allows the player to do some major {{sequence breaking}}. [[http://www.youtube.com/watch?v=iQrd7Mr4b0Q See here.]]
*** It is also generally used by speedrunners that have managed to learn how to use the Boost to swiftly get through stages without being harmed.
%% Don't put AwesomeMusic here, it goes in the YMMV tab.
* BabyTalk: Very slightly with Classic Tails in the HD version, who has an adorable lisp and says "w-" when he means to say "r-" occasionally. Also applies for the other language settings.
* BadAss: Both Sonics, but mainly Modern (as the end of [[spoiler:the Egg Dragoon boss fight]] in the HD version will tell you).
* BadassAdorable: Classic Sonic, both versions of Tails, and Metal Sonic.
* BadFuture: Metal Sonicís Stardust Speedway arena and Crisis City.
* BagOfSpilling: In ''Colors'', (Modern) Sonic can double jump and jump forever underwater. In ''Generations'', he's lost both moves without any explanation.
* BashBrothers: Both Sonics.
* BigBadDuumvirate: [[spoiler:Modern and Classic Dr. Ivo "Eggman" Robotnik.]]
* BonusFeatureFailure: The ability to name your skill sets in the HD version for easy identification is a good idea in theory. But here, you cannot use the [=PS3=] or [=XBox360=]'s keyboard feature and must instead choose two terms from a long, unalphabetized list. That in itself would not be unbearable, but after choosing two terms, they are automatically separated by an ampersand, unless the first term is "Skill Set" and/or the second term is a letter (the default naming scheme). Nearly every catchy title you can think of for your Skill Sets will be blemished by that obtrusive "&". Even PC gamers are stuck with this.
* BookEnds: The game begins and ends at Sonic's party.
* BorderPatrol: Modern Sonic can run across the surface of [[VideoGame/SonicHeroes Seaside Hill]]'s ocean in the HD version, but if he runs too far off the main path for a couple seconds, the giant Chopper from [[VideoGame/SonicTheHedgehog1 Green Hill]] leaps from the water to snap him up.
* BottleEpisode: The entire game uses concepts from previous titles.
* BottomlessPits: They exist, but like in ''VideoGame/SonicColors'', you get a helpful warning sign alerting you to their presence. In tune with the tendency of this game to make {{call back}}s, said warning sign is the [[DeathThrows original Sonic death sprite]].
* BreakingTheFourthWall: Both hedgehogs look at their totals during their Act Clear endings, as well as the "Mission Cleared" text in the 3DS version's mission completion screens.
** Both Sonics can also jump onto the titles of each level; in fact, doing so is how you get to the fight with Shadow.
* BrickJoke: [[spoiler:Sonic's chili dog that goes flying away at the start. Since he returns right after he left, Sonic catches it before it hits the ground.]]
** [[spoiler:And it's still warm. Time travel!]]
* TheBusCameBack: Befitting of a [[MilestoneCelebration game celebrating 20 years of the franchise]], several characters make their first appearances in the console games since ''VideoGame/SonicUnleashed'' made it a point to stop having so many characters.
* ButForMeItWasTuesday: A heroic example: Modern Sonic remarks to Tails that the Time Eater's handiwork is nothing special, considering the [[VideoGame/SonicStorybookSeries genies in magic books]] and [[VideoGame/SonicColors interstellar amusement parks]] they've dealt with in the past.
** Sonic sounds almost resigned to his status as a WeirdnessMagnet when delivering the line in question.
** Another example comes up after defeating the Egg Dragoon, where Sonic brings up how routine Eggman losing to him has become.
* CallBack: Several of them, mainly to zones that couldn't be put into the game.
** There is a corkscrew in Classic [[VideoGame/SonicTheHedgehog1 Green Hill Zone]] that is similar to the one in [[VideoGame/SonicTheHedgehog2 Emerald Hill Zone]].
** There are underwater sections in [[VideoGame/SonicHeroes Seaside Hill]] in the HD version that are reminiscent of those in both the [[VideoGame/SonicTheHedgehog1 Labyrinth Zone]] and [[VideoGame/Sonic3AndKnuckles Hydrocity Zone]].
** Classic Sonic riding a skateboard is similar to the snowboard from [[VideoGame/SonicTheHedgehogTripleTrouble Robotnik Winter Zone]].
** The waterslide in Chemical Plant in the HD version is reminiscent of the ones in [[VideoGame/SonicAdventure Lost World]] and [[VideoGame/SonicAdventure2 Cannon's Core]].
*** Similarly, Sonic falling down the pipe with all the blobs of blue stuff is similar to the same things in Rooftop Run and Eggmanland from ''Sonic Unleashed'' and Aquarium Park from ''Colors''.
** Crisis City in the HD version has a climbing-up-a-cylinder segment similar to the tree segment in [[VideoGame/SonicUnleashed Mazuri]] and a similar segment in [[VideoGame/SonicColors Sweet Mountain]].
*** Another part in Classic Sonic's route has one reminiscent of the upwards ramp in [[VideoGame/SonicTheHedgehogCD Palmtree Panic]].
** Modern Sonic does the ''VideoGame/SonicAdventure'' cover pose as his finishing trick.
*** And Shadow does his ''VideoGame/SonicAdventure2'' cover pose as his trick in his Rival Battle.
** One of Classic Sonic's Stage Clear animations is [[http://www.ssbwiki.com/images/4/4a/Sonic_SSBB.jpg Sonic's official render]] in ''[[VideoGame/SuperSmashBros Super Smash Bros. Brawl]]''.
** The platforms that fly when Classic Sonic runs on them in Sky Sanctuary Zone are based on the spinning blue tops of [[VideoGame/Sonic3AndKnuckles Marble Garden Zone]]. The twist, however, is that these platforms are {{temporary|Platform}} and wear out after enough running.
** Every nation from ''Unleashed'' has their flags flying in front of Spagonia University (which both Sonics pass by) at the beginning of Classic Rooftop Run in the HD version.
** In the HD version, Modern Sonic can ride around Seaside Hill in a [[VideoGame/SonicDrift go]]-[[VideoGame/SegaSuperstars kart]], itself a nod to the bobsled in the original Seaside Hill and Bullet Station.
** Modern Sonic mentions [[VideoGame/SonicStorybookSeries genies, magic books]], [[VideoGame/SonicColors aliens, and interstellar amusement parks]] in an early cutscene.
** If you finish City Escape in the HD version with Modern Sonic's stage as the second one, Rouge calls him "Big Blue," which was her nickname for him in ''VideoGame/SonicChronicles''.
** One mission in Sky Sanctuary in the HD version has Classic Sonic race Amy. She races by [[VideoGame/SonicBattle spinning around like a]] [[VideoGame/SonicHeroes cyclone with her hammer in hand.]]
** One mission in Chemical Plant in the HD version has Modern Sonic have Amy [[VideoGame/SonicAdvanceTrilogy pound her hammer to give Sonic a higher jump.]]
** [[spoiler:Classic Eggman mentions that he's [[DoNotCallMePaul no longer referred to as]] "Robotnik."]] Averted in the Japanese version, as [[spoiler:this would've resulted in a DubInducedPlothole due to the fact that he was always called Dr. Eggman there]].
** Perhaps the biggest -- The game starts the exact same way as [[VideoGame/SonicTheHedgehog1 the original]]: Green Hill Act 1, with the level even starting the same way the original level did.
** If you hit the ship in Modern Rooftop Run with enough robots, it will drop rings, like the bosses in ''VideoGame/SonicColors'' did.
** The original ''Sonic the Hedgehog'' is playable in the console version.[[note]]The PC port removed it, however.[[/note]] Unlocking it is a simple matter of getting the SegaGenesis controller from the Skill Shop.
** A Planet Wisp mission has the spikeball see-saws from the first game's Star Light Zone. There's another such mission in classic City Escape.
** Two missions in Crisis City and Planet Wisp have you bouncing the goal post all the way to the goal, like you could in ''VideoGame/Sonic3AndKnuckles''.
* CallForward: Classic Sonic has several Skills that reference the abilities and shields he can use past the [[VideoGame/SonicTheHedgehog1 original game]]. One of his last Skills is the Homing Attack, a move that Modern Sonic can already use naturally.
** In the 3DS version, Classic Sonic learns the Homing Attack ([[StableTimeLoop from himself]]) earlier, at the start of the Modern Era. At the end of the game, he instead learns how to use Modern Sonic's Sonic Boost, although the ability is unusable as a Skill.
* CamelCase: ''VideoGame/SonicTheHedgehogCD'''s Japanese soundtrack's music for the present time period of Palmtree Panic can be unlocked and the song has the title capitalized as "[=PalmTree=] Panic."
* TheCameo: City Escape in the HD version is packed to brim with them. The names of some modern characters appear on a Chao in Space 2 ad. Some older faces, like Bark, Bean, and Fang, appear on wanted posters. Even Mighty and Ray can be spotted ([[ChuckCunninghamSyndrome on "Missing since 1993" posters, no less]]).
** [[spoiler:Orbot and Cubot appear in Eggman's flashback to TheStinger of ''VideoGame/SonicColors'', which also explains why they are otherwise absent from ''Generations''.]]
** Big, Omega, [[VideoGame/SonicTheHedgehog2006 Princess Elise, Mephiles]], [[VideoGame/SonicUnleashed Chip, Dark Gaia, and the Werehog]] appear briefly in archival screenshots in the credits.
** Omega gets another cameo in Speed Highway, as one of the roads is 123 Omega Road. 123 is his number in the "E" Series.
** Look carefully at the beginning of both stages of Planet Wisp and you'll see some White Wisps. There's even [[http://www.youtube.com/watch?v=Jgzs63pTvc0 one]] in Classic Planet Wisp who dances exactly like Yacker does in the {{Loading Screen}}s of ''Colors''!
** Statues of [[VideoGame/SonicRiders Jet]] and [[VideoGame/SonicAdventure2 all three types of Chao]] can be unlocked in the Statue Room.
* CaptainObvious: Of a peculiar kind. During the fight against the Time Eater in the HD version, a lot of Sonic's friends kindly remind you "That ''looks'' like a homing shot," but only Shadow says "That's a homing shot" with certainty.
* CardiovascularLove: Rouge's challenges in the HD version require using her charm attack, which consists of her blowing heart symbols at Egg Pawns to make them lower their guard.
* CasinoPark: Casino Night Zone, in both versions (though it's only a proper level in the 3DS version).
* ChainsawGood: The GUN truck, which comes equipped with three giant buzz saws this time around in the HD version's Modern Sonic portion.
* ChekhovsGag: [[spoiler:The signpost from Classic Crisis City passes by in the foreground a little while after it's first blown away.]]
* ChekhovsGun: [[spoiler:There's some effort hiding Dr. Eggman from the player on the Death Egg Robot boss in the HD version and the Big Arm boss in the 3DS version, especially when he's "kidnapped" by Time Eater...]]
* CollectionSidequest: The Red Star Rings in the HD version, returning from ''VideoGame/SonicColors''.
* [[ColourCodedForYourConvenience Color Coded For Your Convenience]]: Temporary platforms are associated with the color red.
* CompletelyDifferentTitle, TheForeignSubtitle: In Japan, the 360/PS3 versions of the game are titled ''Sonic Generations: White Time and Space'', while the 3DS version is titled ''Sonic Generations: Blue Adventure''. In western territories, all versions of the game are simply titled ''Sonic Generations''. Even so, both versions have a white or blue backdrop on the boxart.
* ConceptArtGallery: Includes music and art.
* ContinuityNod: Being a game all about Sonic's history, there are loads of it. Now has its own [[ContinuityNod/SonicGenerations page]].
* ContinuityPorn: The ''entire game'' is this, as it features levels from just about every major ''Sonic'' game in the series as well as games not in the major series, including the beloved Sonic CD.
** Even moreso considering [[spoiler:the nature of the game as a sequel to the events of ''Colors''; direct continuity is something rarely seen in more recent Sonic titles, so having it established and directly referred to ''in a game all about Sonic's history'' is a notable achievement on Sonic Team's part.]]
** The preferred name or moniker for Dr. Ivo "Eggman" Robotnik can be thrown into confusion when [[spoiler:Classic]] Eggman states no one calls him by his real name anymore. In as early in modern (western) continuity as ''VideoGame/SonicAdventure'', Eggman and Sonic use the Robotnik name, still preferring his real name in that time, Sonic using both.
* CoolBoard: Classic Sonic has a skateboard, in true early 90's fashion. Modern Sonic uses a snowboard in City Escape, just like old times, as well as in a mission in Rooftop Run.
** Also, the ability to use a skateboard at will is one of the unlockable skills for Classic Sonic.
* CrisisCrossover: The current, [[GreenEyes green-eyed]] Sonic meeting his retro, black-eyed self through Time Eater's disturbance of the time holes. Both hedgehogs must team up to fix Sonic's timeline and defeat the Time Eater.
%% Don't put CrowningMusicOfAwesome here, it goes in the YMMV tab.
* CreditsMedley
* DamnYouMuscleMemory: If you're used to the Homing Attack on the HD versions of ''VideoGame/SonicUnleashed''[[labelnote:*]]where it was shared with the 'Boost' button (X on 360 and Square on PS3).[[/labelnote]], you may have to readjust yourself to the standard Homing Attack controls used in all the other ''Sonic'' games for ''Generations'' HD[[labelnote:*]]Pressing the 'Jump' button (A on 360, X on PS3) in mid-air to perform it.[[/labelnote]].
** There's also the issue of trying to do a Homing Attack as Classic Sonic and trying to do a Spin Dash as Modern Sonic.
** Anyone who was used to playing Colors on the Wii's Classic Controller may have difficulty pressing the slide/stomp button without instinctively reaching for the Y/Triangle button.
*** The double-jump in Colors isn't present in Generations (double-tapping the jump button as Modern Sonic does the forward-air-dash move), which can seriously screw the player up when they accidentally try to double-jump up to a higher platform.
** Stealth Attack. [[PacifistRun Complete the level without defeating enemies.]] Good luck keeping yourself from using the homing attack.
* DeadCharacterWalking: There is an infamous glitch which crept from the infamous ''VideoGame/SonicTheHedgehog2006'' to the otherwise excellent ''VideoGame/SonicColors'' and ''VideoGame/SonicGenerations'' which makes Sonic, if he receives mortal damage while on a autoscrolling sequence, still slide with his dead body on the track. He can even be controlled sometimes with the directional pad!
* DeathThrows: When you lose a life as Classic Sonic, aside from bottomless pits.
* DeflectorShields: The [[PlayingWithFire Flame]], [[MakingASplash Aqua]], and [[ShockAndAwe Thunder]] shields return from ''Sonic 3'' in certain missions, and can be equipped in any main level once said missions are completed. The bounce, flame dash, and spark jump capabilities are fully intact.
* DepartmentOfRedundancyDepartment: In a cutscene after Chemical Plant in the HD version, Modern Sonic says that he's getting "deja vu all over again," paraphrasing a famous quote from Yogi Berra.
* DesignStudentsOrgasm: Featured in the level title cards.
* TheDevTeamThinksOfEverything: A particularly hilarious example. In the modern variation on GreenHillZone, a Crab enemy hitting Sonic will cause it to dance happily at being able to hit him for the first time in twenty years.
** Classic Sonic's [[http://youtu.be/YTXXXCcTKIQ idle animations]] includes one that has him [[VideoGame/Sonic3AndKnuckles pointing to the right]]. He even does this when facing left, except with his thumb instead of with his finger.
* DubInducedPlotHole: Inverted: In the absolutely final cutscene, [[spoiler:The two Eggmans are seen arguing over the fact they haven't found the door one of them claimed to have found]]. The English version's dialog ended sooner than it should be, resulting in a short silence scene that shows [[spoiler: Modern Dr. Eggman pointing angrily at Classic Dr. Eggman while the latter's throwing a fit]]. The Japanese version had them fully voiced during that scene, thus, adding more sense to the scene as to why they're doing those gestures.
* DidYouGetANewHaircut: Several characters make remarks along these lines if rescued as Classic Sonic. For two more literal examples:
** Cream asks Classic Sonic this upon being rescued.
** Upon being rescued, Blaze wonders if Classic Sonic has gotten less spikey, i.e. has less hair.
* DidYouJustPunchOutCthulhu: [[spoiler:Modern Sonic facing Perfect Chaos ''while not in SuperMode''.]]
* DifficultySpike:
** Crisis City.
** In the Modern Era, the challenge stages take a MASSIVE difficulty spike, ''especially'' the Doppelganger races, which now leave extremely little room for error.
* [[DivergentCharacterEvolution Divergent Zone Evolution]]: As [[VideoGame/SonicTheHedgehog1 Green Hill Zone]] has been brought back, [[VideoGame/SonicHeroes Seaside Hill]] has understandably taken many liberties to differentiate itself from the zone it was originally supposed to be a throwback to. Most notably, it's incorporated some aspects of Ocean Palace from Heroes as well as added a water section.
** A lot of the other zones got upgrades to their unique features and obstacles. City Escape's skateboard section was lengthened and expanded as well as the truck was given an upgrade so it will be less like Speed Highway.
* DoubleJump: Classic Sonic can do one with the Thunder Shield.
* DoubleUnlock: Many skills require you to first complete a specific challenge, then buy it from the store.
* DoWellButNotPerfect: Some of the Red Star Rings require you to take a lower path, going against regular Sonic logic to always take the highest path.
* EldritchAbomination[=/=]SpacetimeEater: [[http://www.sonicstadium.org/wp-content/uploads/2011/10/Sonic-Generations-Time-Eater-artwork.png The Time Eater]], a psychotic-looking (seemingly) mechanical being that's covered in a cloud of dark energy and features clockwork parts. All the gears and the purple smoke body may remind you of [[VideoGame/EpicMickey another children's game eldritch abomination...]]
* EldritchLocation: [[spoiler:[[http://www.youtube.com/watch?v=I2wrZ5MXS8Q Time Eater's boss arena, a cloudy reddish-purple void filled with floating props from the previous levels (trees and mountains from Green Hill, the G.U.N truck from City Escape, etc.), and giant golden clockwork parts]].]]
* EmbeddedPrecursor: ''[[VideoGame/SonicTheHedgehog1 Sonic 1]]'' is an unlockable game within the console version.
* EpicFail: At the end, [[spoiler:not only is Modern Eggman stranded in an infinite space void of time with Classic Eggman, but he accidentally convinces Classic Eggman to give up on villainy entirely and pursue a career in schoolteaching. Oddly enough, Eggman approves.]]
-->[[spoiler:'''Modern Eggman''']]: [[spoiler:That's not a bad idea! I've always enjoyed telling people what to do!]]
** [[spoiler: Then again, Classic!Eggman seems to have facepalmed when Modern!Eggman said that, so he may not have actually gone through with it.]]
* EternalEngine: Chemical Plant. Planet Wisp is also well on its way, as it's being constructed on an idyllic alien planet.
** As well as Eggmanland, which serves as the the battle arena against the Egg Dragoon.
* EvilLaugh: Lampshaded by [[spoiler:Classic Eggman as Modern Eggman laughs hysterically]].
-->[[spoiler:'''Classic Eggman:''' Wow. Will I really get that crazy?]]
* ExcusePlot: A giant monster has caused Sonic's friends to become lost in time, and Sonic has to team up with his past self to race through locales from his earlier adventures in order to save them! [[RuleOfFun Sounds good to me!]]
* ExpositionFairy: Omochao. There is an option to turn him on/off, however.
* [[FaceOnAMilkCarton Face On A Poster]]: The fate of Mighty and Ray.
* FacePalm:
** Modern Sonic, in response to Amy when he frees her.
** Modern Sonic also has one when he finds out that [[spoiler:Eggman is controlling the Time Eater, and [[HijackedByGanon is thus the]] BigBad]].
* {{Faceship}}: The Death Egg.
* FailureIsTheOnlyOption: [[spoiler:After the ending credits, Classic Eggman finds out that Modern Eggman has never beaten Sonic. He gets discouraged by this and decides to go get his teaching degree. Modern Eggman thinks that's not a bad idea, since he enjoys telling people what to do.]]
* FastballSpecial: Vector's ability in his Co-Op mission.
* FinalBoss: Hedgehog rivals aside, the boss fights are all final/true final boss fights from other Sonic games; the Time Eater is their successor for this game. The only exception to this is the Egg Dragoon (which was only the penultimate boss in ''VideoGame/SonicUnleashed'', although it did serve as the Werehog's FinalBoss); it should also be noted that Shadow served as the FinalBoss in ''VideoGame/SonicAdventure2'''s Hero Side story.
* FinalBossNewDimension
* FinishingEachOthersSentences: Done by Classic and Modern Tails sometimes. [[spoiler:The Eggmen, as well.]]
* {{Flight}}: The Orange Rocket Wisps return in Planet Wisp in the console version.
** [[spoiler:Modern Super Sonic is capable of limited flight (much higher than the few inches above the ground usually associated with in-level Super), though it eats through rings too quickly to be very useful.]]
* FrickinLaserBeams: The Cyan Laser Wisps return in Tropical Resort in the 3DS version.
** The Time Eater also fires lasers in the final battle.
* {{Flanderization}}: The truck in City Escape. Although in ''Sonic Adventure 2'', the main purpose of the truck was probably to catch Sonic despite collateral damage. In ''Generations'', it basically wants to kill and maim Sonic [[ConvenientlyEmptyBuilding without any care for its surroundings]] (Because why on earth would a truck need [[spoiler:''three buzzsaws, rocket jets'', and the ability to ''drive on the side of a freaking building'']]?).
* FloatingContinent: Sky Sanctuary.
* FollowTheMoney: Naturally, especially evident when rings appear after hitting a switch.
* {{Foreshadowing}}: After the cutscene in which Vector is freed, [[spoiler:his text bubble correctly predicts the nature of the [[BigBad Time Eater]]]].
** [[FridgeBrilliance Well, he IS a detective, after all.]]
** Compared to Eggman's begging for help when he's captured after the Death Egg fight, Eggman has no objections when the Time Eater grabs him after the Egg Dragoon battle and it takes place in a fraction of the time as the first. [[spoiler:With the revelation that the Time Eater is controlled by the two Eggmen, one can see that the first fight was deliberately thrown and that the second was actually a rescue.]]
* {{Friendly Rival|ry}}: Silver. He treats his Arena Battle with Sonic as a sparring session and seems to have a lot of fun whether he wins or loses.
* FungusHumongous: Mushroom Hill in the 3DS version.
* FutureMeScaresMe: [[spoiler:Classic Doctor Eggman is surprised at how maniacal his future self is.]]
* GameBreakingBug:
** In the PC version, it is literally impossible to play the game with most non-Xbox 360 gamepads. Due to a different input format between the 360 controller and other PC controllers, the game will interpret a non-360 controller as having random buttons fired at intervals, making Modern Sonic randomly quick-step left and right and cutscenes skip themselves (the game thinks that the player has pressed Start repeatedly when they haven't). The quick-stepping bug actually renders Seaside Hill Act 2 UnWinnable with a non-360 gamepad unless you hammer the boost button and get lucky.
** The PC version has a couple of consistently-crash-causing spots. The most notable is Rouge the Bat's challenge for Modern Sonic in Seaside Hill, which has a very high chance to crash to desktop at any point during the stage.
** Trying to access the online "Challenge Mode" can be an exercise in frustration, as something about the game's communication with the leaderboard data servers (which takes place ''every time the menu cursor is moved'') causes it to almost always dump the user to the desktop with an error message when it tries to load record data.
* GameMod: A particularly epic one by a trio of programmers from Sonic Retro, who [[http://www.moddb.com/mods/sonic-generations-unleashed-project successfully ported]] the day levels from ''VideoGame/SonicUnleashed'' into the PC version.
** At the request of [[Creator/{{Egoraptor}} Arin Hanson]] in an episode of ''WebVideo/GameGrumps'', a mod replacing Sonic's model with that of an actual hedgehog has been created.
** And with the creation of utilities such as CPKREDIR and [=SonicGMI=], this game's on its way to becoming one of the most easily moddable games for the PC.
* GameplayAndStorySegregation: All of the zones seem to be full of color before you even start moving.
** There's now a mod for the PC version that adds the restoring colours as you run through the world part of the story into the actual gameplay, removing the segregation. [[https://www.youtube.com/watch?v=6xO5_VMDHDI]]
* GameplayRoulette: There are two gameplay styles, but both of them are closely similar, unlike the wildly differing styles in ''VideoGame/SonicAdventure'' and ''VideoGame/SonicUnleashed'', for example.
* GetBackHereBoss: All three Rival battles, the Egg Dragoon, and the Time Eater are fought this way.
* GlassCannon: What the "Endless Boost" does for Modern Sonic. He can boost endlessly through enemies, but will die instantly if he makes contact with something his boost can't protect him from.
* GreenEyes: Modern Sonic.
* GreenHillZone: ''The'' [[VideoGame/SonicTheHedgehog1 Green Hill Zone]], [[VideoGame/SonicHeroes Seaside Hill]], and [[VideoGame/SonicColors Planet Wisp]].
** Oddly enough, despite being the GreenHillZone for VideoGame/SonicColors, the Planet Wisp level in Generations is the final one.
* HailfirePeaks: As in VideoGame/SonicColors, Planet Wisp combines the GreenHillZone motif with an EternalEngine. Crisis City is LethalLavaLand mixed with AfterTheEnd. Most of the levels are combined tropes, really, considering it's a Sonic game.
* {{Hammerspace}}: Lampshaded by Modern & Classic Tails after the final boss. [[spoiler:Specifically, where Sonic keeps all those rings he collects.]]
* [[AutobotsRockOut Hedgehogs Rock Out]]: The first half of the Perfect Chaos battle and the [[ThemeMusicPowerUp Theme Music Power Ups]] that occur in Shadow's Rival Battle are all accompanied by Crush40. On top of that, you have the option of replacing the default theme of any level, even the FinalBoss, with any of the available Sonic music they unlock, which just so happens to include ''[[VideoGame/SonicAdventure Open Your Heart, It Doesn't Matter]]'', ''[[VideoGame/SonicAdventure2 Live and Learn]]'', ''[[VideoGame/SonicHeroes Sonic Heroes, What I'm Made Of]]'', ''[[ShadowTheHedgehog I Am (All of Me)]]'', ''[[VideoGame/SonicTheHedgehog2006 His World]]'', ''[[VideoGame/SonicUnleashed Endless Possibilities]]'', and ''[[VideoGame/SonicColors Reach For The Stars]]''.
* [[TheHerosBirthday The Hero's Birthday]]: The game kicks off [[spoiler:(and ends)]] at Sonic's birthday party.
* HeroicMime: Classic Sonic. The 3DS game, which has text boxes to make up for having less voice acting, only has punctuation like "?," "!," and "..." similar to the main characters of Nintendo and Camelot's ''VideoGame/GoldenSun'' series.
* HijackedByGanon[=/=]TheManBehindTheMan: [[spoiler:The Time Eater is really just a creature transformed into a manned machine by Classic and Modern Eggman.]]
* HoistByHisOwnPetard: [[spoiler:Silver ultimately loses his rival battle by being crushed by the gigantic ball of debris that he tried to attack Sonic with.]]
* HubLevel[=/=]PlayableMenu: The 360/PS3 version skirts the line by having one big [[TwoPointFiveD 2.5D]] WhiteVoidRoom Hub that serves as an "interactive menu" for selecting levels/bosses, talking to Sonic's friends, accessing extra content, etc. Within the narrative, Tails [[JustifiedTrope explains]] that said void is where the stages end up falling into after the Time Eater distorts their position in time and space.
* HumanCannonball: There are cannons which shoot Sonic out of them.
* HumongousMecha: The Death Egg Robot, Egg Dragoon, and Egg Emperor. [[spoiler: The Time Eater is also revealed to be one]].
* IdleAnimation: Classic Sonic still [[MascotWithAttitude glares at the player impatiently]] when idle. He may also occasionally [[VideoGame/Sonic3DBlast cross his arms in frustration]], [[VideoGame/Sonic3AndKnuckles snap at the player and point to the right]] ([[TheDevTeamThinksOfEverything even when he's facing the left, now]], minus the snap), [[VideoGame/SonicTheHedgehog2 look at his wrist, and lay on the ground after a while]].
** Modern Sonic's animations are from ''Unleashed'' and ''Colors'', plus a unique idle animation if he's standing in water.
* IGotBigger: Classic Sonic and Tails are Modern Sonic and Tails as young children.
* IndyEscape: Both acts of City Escape, and other levels.
* InternalHomage: Tons of them. Rooftop Run (originally from ''Sonic Unleashed'') has zipline platforms like in ''Sonic 2'''s Hilltop Zone and dropping platforms with spikes on them like in the original game's Marble Zone.
** And the Classic level ends with what appears to be Sonic & Knuckles' Flying Battery, complete with Eggman logo.
* InvincibilityPowerUp: Invincibility is back for both hedgehogs.
* LampshadeHanging: [[TheGoomba Crabmeats]] do a little happy dance and fall laughing when they hurt Sonic.
** Modern & Classic Tails have a conversation about [[spoiler:where Sonic actually puts all of those rings, with Modern Tails mentioning that he keeps forgetting to ask]].
** One of the tutorial images has Omochao rambling on next to an annoyed Sonic.
** [[spoiler:Right before the final battle, Classic Tails refers to Classic Dr. Eggman as Dr. Robotnik. Classic Eggman replies in a matter-of-fact way that nobody calls him that anymore.]]
* {{Irony}}: Tropical Resort is the first stage in ''VideoGame/SonicColors'', but in the 3DS version of ''Generations'', it is the ''last'' stage.
* LargeHam: [[http://www.youtube.com/watch?v=YoRipW5tMlE Spanish Sonic]]. Also, [[http://www.youtube.com/watch?v=6yJY48EzJX0 German Doctor Eggman]] (Hartmut Neugebauer) has been acknowledged by Sonic Team to be the perfect voice for the good doctor. To be fair, he's also the standard german dubbing voice for [[WilliamShatner a certain other]] [[BostonLegal large ham]].
* LawOfOneHundred: The game returns to giving an extra life at 100 rings, which had been not used in ''VideoGame/SonicColors''.
* LethalLavaLand: Crisis City.
* {{Leitmotif}}: A [[http://www.youtube.com/watch?v=m1KL89ODsHk music piece]] that accompanies the [[BigBad Big Bad]].
* LighterAndSofter: The general tone of the gameís plot.
* LimitedSpecialCollectorsUltimateEdition: The "Collector's Edition" for the 360/PS3 versions of the game comes with a statue featuring both Modern and Classic Sonic, a commemorative Gold Ring, the "''20 Years of Sonic Art''" book[[labelnote:*]]Featuring never before seen artwork.[[/labelnote]], the "''20th Anniversary Sonic Soundtrack''"[[labelnote:*]]Featuring a selection of tracks handpicked by Sonic Team.[[/labelnote]], the "''History of Sonic: Birth of an Icon''" documentary[[labelnote:*]]An exclusive collection of interviews and footage charting Sonicís life from inception through to becoming one of the most iconic characters in videogame history.[[/labelnote]], and DownloadableContent[[labelnote:*]]The [[VideoGame/SonicTheHedgehog2 Casino Night Zone]] Pinball Minigame, a 20th Anniversary theme, and a [[SuperMode Super Sonic]] costume for your Xbox 360 Avatar.[[/labelnote]]. [[NoExportForYou Only available in Europe and Australia though.]]
** The [[NoExportForYou Japanese-exclusive]] "Special Editon" comes with a crystal cube featuring Modern Sonic with the Classic Sonic TV as the indentation.
* LiteralAssKicking: How Classic Sonic deals damage to the Death Egg Robot boss in the HD version in the first phase of the battle.
* LoadsAndLoadsOfCharacters: Though only Classic and Modern Sonic are playable, a majority of his friends do show up as non-playable characters.
* LongSongShortScene: The Super Sonic theme of this game is as long as the equivalent themes from other games and even loops, yet it only plays briefly in the cutscene prior to the final boss (and not when either Sonic transform outside of said boss fight). It, incidentally, is a remix of ''VideoGame/SonicTheHedgehog4'''s theme, the only apparent nod to that game in Sonic Generations.
* LostFoodGrievance: That poor chili dog... [[spoiler:At least it comes back eventually.]]
* MadeOfExplodium: Just about anything the GUN truck plows through.
* MeetYourEarlyInstallmentWeirdness: Sonic, Tails and [[spoiler:Dr. Eggman]] met themselves as they appear in the Genesis games.
* MercyMode: The Nintendo3DS version of the game's TimeAttack mode and the Challenges in the other versions counts as this. Previous [[SonicAdvanceTrilogy handheld]] [[VideoGame/SonicRushSeries Sonic]] [[VideoGame/SonicColors games]]' time attacks sent you straight to the "retry/change-zone/change-character/quit" menu after either finishing the level or dying, but in ''Generations'' this happens only after having completed the stage; dying results in either restarting the stage or respawning at the last checkpoint instead. This means you can practice sections as much as you please. However, respawning at a checkpoint ''[[ContinuingIsPainful doesn't set the timer to whatever time you happened to run past said checkpoint.]]'' So, if scoring a perfect time is your top priority, you have to restart the level manually.
* MilestoneCelebration: Developed as part of the franchise's 20th anniversary.
* MirrorBoss: The Rival Battle with Shadow. Until one of them gets a power-up, or Sonic falls too far behind Shadow, the two hedgehogs basically have identical abilities, boosting included.
* MissingTrailerScene, NeverTrustATrailer: Remember all that cool CGI footage from various trailers? Yeah, only ''one'' of those is in the game... hidden away in the AttractMode (and is thus entirely missable), which is quite unusual for a modern ''Sonic'' game.
** Neither Kele Okereke or My Chemical Romance are heard anywhere in the game.
* MissionControl: Omochao, to some extent. [[spoiler:All of Sonic's friends join in as well in the final boss battle, calling out incoming attacks.]]
* MonsterOfTheWeek: A tradition since ''Sonic Adventure'', Time Eater is the one for this game. [[spoiler:Subverted: it ''was'' a monster but it's turned into a manned robot by Dr. Eggman with the help of his past self.]]
* TheMotherShip: Classic City Escape's GUN truck can dump off more {{Mooks}} on Classic Sonic.
* MuseumGame: The game is basically traveling through the past of ''Sonic'', with a lot of extras on the side. It contains levels themed entirely after locations from previous games in the ''SonicTheHedgehog'' franchise. There's also a gallery of concept art, information on characters in the series, and the ability to earn music from the series.
* MusicalNod:
** Classic "Escape from the City" has a brief remix of Endless Mine, from ''Sonic 3'' and the melody of the City Escape trial version.
** Modern's version of "Escape from the City" uses pieces of the theme for the Snowboard Race multiplayer level and "It Doesn't Matter" from ''Sonic Adventure 2''.
** An entire section of Modern [[VideoGame/SonicHeroes Seaside Hill]] is practically devoted to remastering Ocean Palace. That's right, they haven't just [[SubliminalSeduction subliminally seduced you]] with the use of putting traits from older Sonic series selections into newer songs, but they mashed-up two themes from Zones of the same category!
*** On that note, Classic Seaside Hill greatly resembles the NintendoDS version of ''[[SegaSuperstars Sonic & Sega All-Stars Racing]]''[='=]s Seaside Hill.
** A remix of "Door into Summer" from ''KnucklesChaotix'' is the theme for the Collection Room.
*** The song that plays for Classic Sonic's Ring Time power-up is a remix of the special stage theme from ''Knuckles Chaotix''.
** Modern Sky Sanctuary lifts its extended bits directly from the ''[[VideoGame/MarioAndSonicAtTheOlympicGames Mario & Sonic at the Olympic Winter Games]]'' rearrangement of Sky Sanctuary.
** The cover of "[[SonicR Super Sonic Racing]]" samples [[http://www.youtube.com/watch?v=haOCJ8wL0OA this]] SegaSaturn promo; more precisely, the lines "We are five years away from entering the 21st century" and "Introducing Sega Saturn!"
** Sega pulled us a rather tricky one with this one: [[spoiler:Super Sonic]]'s theme begins with the intro of ''[[VideoGame/SonicAdventure2 Live and Learn]]'', only to be followed by a remix of [[spoiler:VideoGame/SonicTheHedgehog4[='=]s Invincibility]].
** Does the theme for obtaining an [[RankInflation S Rank]] sound familiar? It's a remix of a verse from Sonic's ''[[VideoGame/SonicAdventure Adventure]]'' theme.
* MythologyGag:
** Sonic shredding air guitar sure looks [[SonicUnderground familiar]]...
** In the opening cutscene, Classic Sonic can briefly been seen having a sharp fang in his mouth. This is an obvious nod to his early concept art, which depicted him as having fangs.
** When [[spoiler: Classic Dr. Eggman appears, Classic Tails calls him "Robotnik". The doctor then says, "Nobody calls me that anymore!"]] Averted in the Japanese version, as [[spoiler:this would've resulted in a DubInducedPlothole due to the fact that he was always called Dr. Eggman there]].
** Vector sets up a venue in one of the Modern Rooftop Run challenges, with him playing the keys. In the [[WhatCouldHaveBeen scrapped]] [[http://info.sonicretro.org/images/2/26/Sonicband.jpg Sonic Band]], he was the keyboardist.
** The pink water in [[VideoGame/SonicTheHedgehog2 Chemical Plant]] makes Modern Tails [[ThatOneLevel really nervous]].
** In one section of classic Chemical Plant, Sonic hits a spring and goes so fast he outruns the camera, this is a glitch that could only be done in ''Sonic 2'', and can't be done in any other stage in ''Generations''
** The opening to Sonic and Shadow's rival battle is exactly like the opening to Sonic Adventure 2: Battle.
*** While said rival battle takes place outside the space colony ARK, the ''[[VideoGame/SonicAdventure2 SA2]]'' opening is actually set in Radical Highway instead. That level in question marks Shadow's first playable appearance in the whole series, so, if you also consider that Shadow and Sonic never actually faced each other in Radical Highway, the re-use of the level in the 3DS version of ''Generations'' for the rival battle due to technical constraints [[FridgeBrilliance suddenly]] becomes more [[JustifiedTrope justifiable]].
** There are a few grape vines in Sky Sanctuary's hub. According to the ''Sonic 3'' manual, these were Knuckles' TrademarkFavoriteFood.
*** Speaking of {{Trademark Favorite Food}}s, Sonic is seen eating a chili dog in one of the very first cut scenes of the game.
** One of the missions--specifically the race against Tails in Green Hill as Modern Sonic--is called "Way Past Fast", possibly in a nod to [[WesternAnimation/SonicSATam SATam]].
*** Sonic actually calls himself "the fastest thing alive" in one of the first cutscenes in the 3DS version.
** Bark and Bean are seen on "WANTED" signs in City Escape along with Fang as a cameo, likely a reference to the [[ComicBook/SonicTheHedgehog Archie comics]] where they are {{Ineffectual Sympathetic Villain}}s (their allegence is completely ambiguous in [[VideoGame/SonicTheFighters their one game appearance]]).
** In Mushroom Hill Act 1, there's a checkpoint just before the goal. This is a subtle nod to the mini-boss fights in ''Sonic & Knuckles''.
* {{Nerf}}: In the console and PC version, the Sonic Boost's ring-attracting effect has been reduced from ''Unleashed'' and ''Colors''.
** Also as Super Sonic, the boost ability greatly exhausts your ring count. Compare to Sonic Colors where the player would not only maintain the more gradual ring loss, but actually earns bonus points for using the Super form in the first place.
* NeverTrustATrailer: Apart from the launch trailer, none of the CGI shown in the trailers exists in the game, infact the trailer at the start is the only cutscene to ''use CGI'', the rest use gameplay models.
* NeverSayDie: Dr. Eggman says how he is going to turn Sonic into blue jelly.
** When Sonic sees himself in a mirror, Dr. Eggman says he better get a good look, because it's the last thing he will see before Eggman "closes his eyes forever."
** Averted by Tails when he's rescued.
* NoDeathRun: Completing an act without losing any lives gives you a Perfect Bonus, which boosts your rank by one full letter grade. In the main levels, the coveted S rank is only attainable by giving an A-rank performance with no deaths. \\
\\
Restarting an act lets you try for the Perfect Bonus again, at the cost of a life[[labelnote:*]]alternatively, you can quit to the level select and re-enter, saving you a life, but subjecting you to extra loading time[[/labelnote]]. Strangely, dying before reaching your first checkpoint [[CaptainObvious eats up one life]] and sets the clock back to 0:00:00, as if you had restarted the act, but the Perfect Bonus is no longer attainable[[labelnote:*]]this can thankfully be circumvented by restarting the act before the loading screen pops up[[/labelnote]].\\
\\
It's possible to earn S-ranks in the challenge levels even if you lose a life, as completion time is the only deciding factor. But since dying will usually set you back a considerable amount of time, a NoDeathRun is still recommended.
* NostalgiaLevel: Every level in the game is derived from old ''Sonic'' games, though the level design is mostly new. It works both ways; Modern Sonic plays through classic stages with the new style of gameplay, and Classic Sonic plays through newer stages with nostalgic gameplay.
* NotBad: [[spoiler:Knuckles says this to Sonic after he defeats the Time Eater.]]
* NotSoFastBucko: In [[spoiler:Act 1 of Crisis City in the HD version, as you approach the goal sign, it gets carried away by a flaming tornado.]]
* OhCrap: Classic Sonic has no dialogue, but his expression at the [[BigBad Time Eater's]] initial appearance is definitely this.
* OminousLatinChanting: The words sung in [[http://www.youtube.com/watch?v=8EkbV8VW3-4 Modern version of Time Eater's battle music]] are ''Dominus Tempus'', roughly translated from Latin to "Master of Time"; fitting Time Eater's role in the game.
* OxygenatedUnderwaterBubbles: Chemical Plant's Mega Mack features these, unlike the original level. Seaside Hill also has them, which is, again, a new thing as Seaside Hill's original iteration had no underwater gameplay.
* PalmtreePanic: Green Hill Zone, Emerald Coast, and Seaside Hill.
* PinballZone: Casino Night. It's a full-fledged world in the 3DS version, but just the setting for a pinball minigame in the console version.
* PlayingTennisWithTheBoss: One side mission requires you to bat music notes back and forth with Vector.
* PlayingWithFire:
** The Red Burst Wisps return in Tropical Resort in the 3DS version.
** The Fire Shield power-up from Sonic 3 finally makes a return. It still allows Sonic to perform a fire tackle.
** Iblis' minions return in Crisis City.
* PopStarComposer: Alex Makhlouf, of Cash Cash, does a few remixes for the game.[[labelnote:*]]If you really want to know the specific remixes he did, according to the OST's booklet they are: Classic Speed Highway, "Going Down!?", Classic City Escape, "Super Sonic Racing" and US Stardust Speedway for the console version; Classic Radical Highway, Modern "Back 2 Back" (Water Palace), Big Arms and the Special Stages for the 3DS version.[[/labelnote]] Tony Harnell and Ted Poley also returned to sing "Escape from the City".
* PowerupMagnet: The Thunder Shield.
* PreOrderBonus: Preorders from [=GameStop=] in the US or GAME in the UK net you the Casino Night DLC minigame. On the other side of the pond, Japanese preorders come one of two bonus soundtrack [=CDs=] (depending on the ordered version) containing the original songs of just about every first stage in the franchise.
** The [=GameStop=] Xbox 360 pre-orders also come with an avatar outfit of Super Sonic and a 20th Anniversary background theme.
** Preordering it from {{Steam}} gives the account it was purchased with ''VideoGame/Sonic3DBlast'' and ''VideoGame/Sonic3AndKnuckles''.
* PressXToNotDie: In the 3DS version, when escaping from the killer whale in Emerald Coast Act 2.
* RedAlert: Used during Chemical Plant's meltdown in Modern Sonicís level.
* RetCon: Even more of this occurs with Crisis City, as [[spoiler: when Blaze is rescued, her first speech balloon post-cutscene has her state that Crisis City was ''her'' fault]].
* RidiculouslyCuteCritter: Classic Sonic and Classic Tails.
* TheRival: Shadow, Silver, and Metal Sonic.
* {{Sampling}}: The JP [[VideoGame/SonicTheHedgehogCD Stardust Speedway]] remix samples the original JP BadFuture Stardust Speedway and JP Present Stardust Speedway.
* SceneryPorn: Lots, as is to be expected in a Sonic title.
** SceneryGorn: Crisis City, and the ruined Station Square in which you fight Perfect Chaos.
* [[NintendoHard Sega Hard]]: The Doppelganger Races. Good. '''God'''. The premise is simple enough: run through Act 1 or 2 of a zone and reach the finish before the doppelganger. There's several major problems, though. The doppelganger is fast. Better-than-A-grade fast. And you can't slow him down in any way, because he's intangible (a physical representation of an imposed time limit; a "time ghost", if you will).\\
\\
To add insult to injury, even if you do manage to win, you are almost guaranteed to be awarded a D-grade, because once you go over S-grade time, every 5-15 seconds afterward will drop you one more full letter grade. By the way, since this is a challenge level, you can't equip any skills, and you can't boost your grade by collecting rings (AND unlike most challenge levels, there are no pick-ups to reduce your time). Even if you've managed to get an S-grade in the act proper, you will find yourself 10% more bald than when you first started playing the Doppelganger Race. [[SarcasmMode Have fun.]] Oh and if the doppeleganger wins, you get to start the entire level over from the start.
** Some of the "friend" challenges aren't a whole lot easier, especially Vector's two. In his Crisis City one, you end up fighting the wind as you try to guide him. In his Rooftop Run one, you have to chase notes and try to homing attack them back to Vector, but you end up having to basically memorize where the notes will go so you can get to them. The usual homing attack length seems shortened.
** And introducing Charmy's friend challenge at [[http://www.youtube.com/watch?v=fB_yLPulBOc Planet Wisp]]. My god...
** Beating [[spoiler:The Time Eater]] without getting hit gives you a trophy/achievement.
* ShoutOut
** At some point in the Modern Sonic gameplay, you're offered the chance to make [[ButtonMashing air combos]]. The [[http://images4.wikia.nocookie.net/__cb20110611040617/sonic/images/c/c7/Sonic_Generations_Sonic_Adventure_Pose_2.jpg finishing pose]] will remind you of something [[http://membres.multimania.fr/sonicartarchive2/sonic/S-D1.PNG very familiar and fond]].
** City Escape has new billboards that include a mock iPhone... and honey! It seems that old [[http://www.youtube.com/watch?v=zDDP9OXF354 advertisement]] is back.
** The first part of Modern Sonic's S Rank pose is based on [[http://upload.wikimedia.org/wikipedia/commons/c/cd/Usain_Bolt_Lightning_pose.jpg Usain Bolt's "To Di World" pose]].
** The [[NightsIntoDreams NiGHTS]] Resort re-appears in Radical Highway.
** The cutscene prior to the battle with Shadow has Sonic and Shadow mimicking the updated opening for the Gamecube version of ''VideoGame/SonicAdventure2 (Battle)''.
** One of Planet Wisp's challenging acts features all three elemental shields. The mission itself is called "[[CaptainPlanet With Your Powers Combined]]".
** The hardest achievement is called "[[McHammer Can't Touch This]]".
** The game's BigBad, [[spoiler: The Time Eater]], is reminiscent of another EldritchAbomination who consumes time, the [[spoiler: [[VideoGame/ChronoCross Time Devourer]]]]. They are both even fought in an EldritchLocation.
** [[VideoGame/SonicAdventure2 Sky Rail's]] propeller Springs can be found in one of Sky Sanctuary's [[http://www.youtube.com/watch?v=ay6QMSEs challenges]].
** Silver's Psychic Knife attack looks familiar to [[VideoGame/SonicHeroes another boss that did it]]...
** In the 3DS version, some missions will require you to get through an entire stage without losing a single life. All missions of this type are titled "Film/DieHard".
** Before the game was released, SEGA used the original blue-text-on-white-background logo, complete with "SEEGAA." It was changed to the newer one in the full game.
** In Act 1 of Sky Sanctuary, there are platforms that allow Sonic a small degree of flight when he runs across them, similar to the tops from the Marble Garden Zone of ''[[VideoGame/Sonic3AndKnuckles Sonic the Hedgehog 3]]''.
** In [[VideoGame/SonicAdventure Speed Highway]], one of the billboards advertises a movie called [[Film/StarTrekIIITheSearchForSpock Chao In Space: The Search for Tikal]].
* ShownTheirWork: Classic Sonic looks ''exactly'' like the original Sonic design from the Genesis games, starting with the coloring details (black irises and flesh-colored eyelids), all the way to the animations and sound - even the CheekyMouth looks identical. Heís closer to his smaller and cuter Japanese design, as opposed to his [[AmericanKirbyIsHardcore attitude-infused Western design]] used on the box-art for the US versions of the original SegaGenesis trilogy (which Sonic Team admittedly hated).
** All of the Classic Character designs featured in the game seem to be based off of these artworks specifically: [[http://info.sonicretro.org/images/7/71/Classic_sonic_orthographic.svg]], [[http://info.sonicretro.org/images/e/e6/Classic_Super_Sonic.png]], [[http://info.sonicretro.org/images/6/6f/Classic_tails_orthographic.svg]], [[http://info.sonicretro.org/images/f/f3/Classic_metal_orthographic.svg]], [[http://info.sonicretro.org/images/e/e3/Classic_eggman_orthographic.svg]].
** Orcas, likely as a reference to the one that chased Sonic in Emerald Coast in ''VideoGame/SonicAdventure'', help Sonic cross large bodies of water in Seaside Hill in the HD ''Sonic Generations''. Emerald Coast ''does'' appear in the 3DS version, but not the HD one, and in the former, it chases both Sonics in their acts as it did in its debut.
** Classic Tails' aforementioned BabyTalk may have been taken from [[Anime/SonicTheHedgehog Sonic OVA]].
* SilentSnarker: Classic Sonic [[http://www.youtube.com/watch?v=WxOGYimyriI on occasion.]]
* SoundtrackDissonance: [[http://www.youtube.com/watch?v=iyg5ojGpVTs&feature=related This]] [[VideoGame/Sonic3DBlast peaceful theme]] plays during a few Co-Op missions. Even in Crisis City's.
** The game lets you invoke this by allowing you to switch out the BGM of a stage or boss for any song you have unlocked in challenges. Yes, you are fully allowed to fight Perfect Chaos to the sound of Emerald Hill Zone if you really want to.
* SprintMeter: The Auto-Gauge skill turns the Boost Meter into this.
* StableTimeLoop: [[spoiler: The ending shows Classic Sonic attempting to perform the Air Boost, suggesting that he learned it by watching his future self do it in an earlier cutscene.]]
* StealthPun: In the classic stage of Speed Highway there's a ring-related pun with a bell.
** Vector's name and his FastBallSpecial.
* SuperDrowningSkills: Oddly, Modern Sonic zigzags this, depending the viewpoint. When transitioning to a 2D section with liquid, he works exactly how he handles in ''Colors'' (minus infinite jumping). However, in full 3D segments, he drowns instantly if he falls into any liquid.
* TheStinger: After the credits, [[spoiler: we see Modern and Classic Eggman bickering inside the HubLevel, now completely emptied by the restoration of the timeline.]]
* SuperSpeed
* TacticalSuicideBoss: The Death Egg Robot is fought in an arena with mines classic Sonic can activate to stun the boss. No matter how many times he's damaged he will still do this. [[spoiler:Though with the ending its obvious he was throwing the fight.]]
* TakenForGranite: What Time Eater does to Sonic's friends.
* TalkingToHimself:
** [[spoiler:Mike Pollock talking to himself as the Eggmen.]]
** Kate Higgins talking to herself as the Classic and Modern Tails.
** [[JustifiedTrope Given the premise, this is justified.]]
* TaughtByExperience: [[spoiler:Eggman makes sure the MonsterOfTheWeek is completely under his control by mechanizing it, instead of failing to control it like in most previous games.]]
* TemporaryPlatform: Lots of them. Both stationary and moving ones.
* TennisBoss: Vector, in one of Rooftop Run's Challenges as Modern Sonic. You have to reflect the music notes at him until he loses track and you win.
* ThemeMusicPowerUp: In the Rival Battle with Shadow, when either Sonic or Shadow goes on the offensive, the music switches to ''Live and Learn'' or ''[[ShadowTheHedgehog All Hail Shadow]]'', respectively.
** When [[spoiler:Classic and Modern Super Sonic combine to strike the final blow on the Time Eater]], the music changes to the Sonic 4 invincibility theme.
* TimeTravel: The two Sonics travel through stages of their past in an attempt to restore time.
* TookALevelInBadass: The [[VideoGame/SonicAdventure2 Mad Convoy]] went from a nearly harmless sloth that could be defeated by a small arch that they could clearly see a mile away to a monstrosity in Generations! It is ''far'' larger than the ''VideoGame/SonicAdventure2'' counterpart, it can destroy entire buildings without leaving a dent, and is able to contain gigantic saw blades and a ''rocket'' that gives it enough power to not only fly, but run up a wall. Not much better in the Classic version of City Escape where it is willing to tear down the city just to flatten a small blue mammal!
** Modern Sonic, who can defeat [[spoiler:Perfect Chaos]] without [[spoiler:transforming into Super Sonic]].
*** Also, the final hurdle of Rooftop Run for Classic Sonic is climbing a very tall clock tower fighting off lots of badnicks and performing tricky jumps along the way. Modern Sonic just runs straight up it in a matter of seconds.
** In Sonic 3 the fire shield's dash was a basic mid-air dash that helped get to top speed or maneuver from a stop. Here it can effectively be a mid-air boost for the otherwise lacking classic Sonic.
** [[spoiler:Silver's psychic powers]] are shown to be considerably more powerful in this game than they've ever been shown to be before. He's also much faster, easily able to keep up with a boosting Sonic.
** In the span of two games, [[spoiler: Eggman went from enslaving an alien race to power a theme park, to transforming an EldritchAbomination into a HumongousMecha [[RealityWarper that rips apart time and space]]]].
** The [[FanNickname Trollnado]] from [[VideoGame/SonicTheHedgehog2006 '06]], arguably, which still chucks cars and other rubble at Sonic as though it were sentient. What takes the cake is that [[CrowningMomentOfFunny it steals the sign post at the "end" of Act 1]].
* UnderTheSea: [[VideoGame/SonicTheHedgehog2 Chemical Plant]], [[VideoGame/SonicHeroes Seaside Hill]] and [[VideoGame/SonicRushSeries Water Palace]]. The last two double as UnderwaterRuins.
* UnexpectedCharacter: Classic Sonic's appearance in the initial teaser trailer.
** Five older characters[[labelnote:*]]Bark the Polar Bear, Bean the Dynamite, and Fang the Sniper from ''Sonic the Fighters'' and ''Sonic Triple Trouble'' along with Ray the Flying Squirrel and Mighty the Armadillo from ''SEGASONIC Arcade'' and ''Knuckles Chaotix''.[[/labelnote]] appear on posters in City Escape - Three are wanted, two are missing.
** Sonic Boom and the US Stardust Speedway [[http://www.youtube.com/watch?v=15rGdGl0uHQ theme]], especially since the game use the JP/EU version by default and the 2011 port of ''SonicCD'' was thought that it only had the JP/EU soundtrack at the time.
* UnflinchingWalk: After Classic Sonic defeats the Death Egg Robot and it falls over, he lands on his feet in a badass pose.
** [[spoiler:And then not one second later, he flinches as the robot explodes behind him.]]
* UnskilledButStrong: Classic Sonic, in comparison to his modern form, has less athletic power and variability, but makes up for it by being bale to achieve Sonic Boost level speeds through just running alone. Taken UpToEleven if you get clever with [[GameBreaker Spindash techniques]] and displayed interestingly through the use of the GameMod Classic Sonic Adventures, which switches the Classic and Modern stages with accommodations for both. While Classic Sonic has nearly showstopping trouble with turns and lanes due to the lack of a the Sonic Drift and Quick Step, he can absolutely DESTROY 2D sections and any length of road given to stretch his legs. If equipped with the Homing attack and a little practice and route plotting, he can easily become a LightningBruiser capable of getting through Modern Sonic's stages with relative ease at INCREDIBLE speeds.
* VariableMix: The BGM in Modern Sonic's Green Hill and Sky Sanctuary stages have a percussion track that changes tempo depending on how fast Sonic is moving. This is also used in ''VideoGame/SonicColors'', in which the bass line in that game would vanish while boosting.
** The speed shoes return in Classic Sonic's stages, so naturally the tempo picks up while using them.
** The Death Egg Robot has two additional drum tracks as the fight progresses.
** The Time Eater's theme seamlessly changes styles [[spoiler:according to which Super Sonic is in control; from an orchestral style for Modern Super Sonic to an electronic style for Classic Super Sonic]].
** [[http://www.youtube.com/watch?v=RbUGEQw36Co The hub world]], which has a mix based on every stage in the game.
* VideoGameSettings:
** GreenHillZone: [[TropeNamer Green Hill Zone]], Planet Wisp.
** EternalEngine: Chemical Plant, Planet Wisp.
** FloatingContinent [=/=] TempleOfDoom: Sky Sanctuary.
** GraffitiTown: Speed Highway, City Escape, Crisis City, Rooftop Run and Radical Highway.
** PalmtreePanic: Seaside Hill, Emerald Coast.
** UnderwaterRuins: Seaside Hill, Water Palace.
** LethalLavaLand: Crisis City.
** CasinoPark: Casino Night.
** TheLostWoods: Mushroom Hill.
** {{Tomorrowland}}: Stardust Speedway.
** AmusementPark: Tropical Resort.
* VillainTeamUp: [[spoiler: The union between Modern and Classic Eggman.]]
* TheVoiceless: Classic Sonic, keeping with the spirit of the Genesis games. Oddly enough, Classic Tails and [[spoiler:Classic Eggman]] do talk.
** VoiceForTheVoiceless: Classic Tails speaks on Classic Sonic's behalf.
* WallCrawl: The Pink Spike Wisps return in Planet Wisp on the console version. Modern Sonic can also run along (and up and down) walls in Speed Highway and City Escape.
* WallJump: Can be done on certain surfaces as Modern Sonic.
* WhamEpisode: [[spoiler:Dr. Eggman takes control of an absurdly powerful creature ''without'' it getting out of his control. Considering that Eggman had been failing to do this repeatedly, this is a genuine twist.]]
* WhatCouldHaveBeen: Early plans were for [[WesternAnimation/AdventuresOfSonicTheHedgehog Jaleel White]] to voice Classic Sonic, but ultimately the dev team felt having him as a SilentProtagonist would fit the story better.
* WhatHappenedToTheMouse: It's never explained [[spoiler: what happened to Orbot and Cubot when Eggman found the Time Eater. It's assumed he just left them in space]].
* WhiteVoidRoom: It's used as the HubLevel.
* XtremeKoolLetterz: The "Mad Skillz" achievement.
** One of the words available to name your Skill Sets with is "Skillz."
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-->'''Modern Sonic:''' Hey Sonic! Enjoy your future; it's gonna be great!
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