Sonic Generations (ソニック ジェネレーションズ: 白の時空 Sonikku Jenerēshonzu: Shiro no Jikū?, lit. "Sonic Generations: White Time and Space") is a platformer video game developed by Sonic Team and published by Sega in late 2011, to celebrate the 20th anniversary of the Sonic the Hedgehog series. While the game came out in home consoles and PC, an alternate version of the game was also released by Dimps for the Nintendo 3DS. All versions of this game can be played in stereoscopic 3D, but a 3DTV as well as a pair of 3D glasses are required for the PlayStation 3 and Xbox 360 versions, being the first game of the franchise to support stereoscopic 3D.
The PlayStation 3 version was available to be streamed on the PlayStation 4, PlayStation 5, and PC via the PS Now subscription service, with PlayStation 3, PlayStation Vita, Sony Bravia Smart TV (2013, 2014, 2015 and 2016 models), Sony Blu-Ray players and Samsung Smart TV support for the service being dropped in 2017. In April 2018, the Xbox 360 version of the game was made backwards compatible with the Xbox One and supports Xbox One X enhanced features, as well as FPS Boost for the Xbox Series X and Series S since 15 November 2021, making the game run at 60fps.
In Sonic Generations, Sonic celebrates his birthday party with his friends, only for them to be kidnapped by the Time Eater and left trapped in White Space. Teaming up with a younger version of himself, Sonic explores White Space to find his friends, defeat the Time Eater and return home.
Classic Sonic is running through the Green Hill until he hears a noise and senses a brief earthquake, though he ignores it. Soon after though, a mysterious entity known as the Time Eater appears in the sky and everything whites out.
In the present day in the mainstream universe, Tails arrives at a gathering that is attended by his friends. Arriving soon after, Modern Sonic discovers that his friends have been preparing a surprise birthday party for him, as it is his birthday. Modern Sonic celebrates his birthday with his friends until the Time Eater disrupts the party by sucking everyone through various Time Holes and scattering them across time and space. Not happy with this, Modern Sonic tries to attack the monster, only for it to knock him down. The impact of the attack leaves Modern Sonic unconscious in the grass.
A while later, Modern Sonic regains consciousness, though he finds himself in a strange dimension known as White Space. Noticing a colorless portion of Green Hill and Tails (now a colorless statue) nearby, Modern Sonic races through Green Hill, which regains color and life after he runs through it. At the same time, Tails is restored too. The two then spot Chemical Plant in the same colorless state as Green Hill was nearby, and Modern Sonic heads over there to investigate. Meanwhile, Classic Sonic, whom Tails mistakes for Modern Sonic, passes by and goes to Chemical Plant as well. Later, Modern Sonic meets Tails at the Chemical Plant. While there, the hedgehog tells his friend that he is getting a strange sense of déjà vu from passing through these areas. Exiting the Chemical Plant, the area goes back to normal following Modern Sonic and Classic Sonic's run through it. However, each Sonic is unaware of the other's presence. At the same time Chemical Plant is restored, Amy is restored as well.
Afterwards, the two Sonics race through Sky Sanctuary, restoring Knuckles in the process. Following that, Classic Sonic ends up on a highway in Stardust Speedway, where he defeats Classic Metal Sonic and gets a Chaos Emerald from him. Later, Modern Sonic and Classic Sonic end up inside a Boss Gate at the same time, separated by a glass wall, which they each think is a mirror. Suddenly however, Modern Eggman's voice is heard from the exit of the Boss Gate, mocking the hedgehogs and telling them that he will end Sonic soon. While Modern Sonic is unfazed by the taunt, Classic Sonic heads into the exit. Modern Sonic then realizes that there is another version of himself here, and tries to enter the exit as well, only for it to close before he is able to pass through it. Meanwhile, Classic Sonic fights Classic Eggman and his Death Egg Robot aboard the Death Egg. After the doctor is defeated though, he is kidnapped by the Time Eater as he begs Sonic for help. Later, both Sonics meet in White Space, surprised by each other's presence. They also meet both Classic Tails and Modern Tails. The four of them then discover that they are traveling through time and space, which explains the various locations they recognize. The quartet subsequently team up to stop the Time Eater's rampage and save their remaining friends.
Continuing onward, the Sonics rescue Cream the Rabbit and Cheese after restoring Speed Highway, Rouge after restoring City Escape, and Espio after restoring Seaside Hill. Along the way, the two Tailses figure out that the Time Eater is tearing space apart as it moves through time, thereby ripping places from across space and time from their locations in their timelines and placing the-now lifeless and dead areas in White Space. However, by speeding through time in these areas, the Sonics are able to fix space and return life to these areas. With the universe about to fall into chaos because of the Time Eater however, the Sonics realize they have to get going like never before. Soon after, Modern Sonic claims a Chaos Emerald following a meeting and clash with Shadow onboard the Space Colony ARK. Not long after, he finds himself in a flooded Station Square where he defeats Perfect Chaos. Afterward, the Classic and Modern pairs discover that the Time Eater does not like the Chaos Emeralds, making their hunt for the gems even more important. Continuing their adventure, the Sonics pass through Crisis City, Rooftop Run and Planet Wisp, restoring these locations and rescuing Blaze, Vector and Charmy too. Meanwhile, Modern Sonic wins a Chaos Emerald from Silver after defeating him in a fight in Crisis City. He also goes on to fight Modern Eggman and his Egg Dragoon in Eggmanland. After defeating Modern Eggman however, the doctor is taken away by the Time Eater, confusing the heroes.
After collecting all the Chaos Emeralds, the Sonics and Tailses confront the Time Eater in its domain. There, they discover that the Time Eater is being piloted by both Classic Eggman and Modern Eggman. Modern Eggman reveals that while drifting through space following the events of the Wisp incident, he found the primordial form of the Time Eater. Discovering that the creature had the power to erase time and space, Modern Eggman decided to use its powers to alter the past and undo his previous defeats by erasing Sonic's actions from history. However, he needed someone just as smart as him to perfect his modifications for the Time Eater, which was why he had it abduct Classic Eggman earlier. Confident that Eggman still cannot win, the Sonics engage the Time Eater. Although the Time Eater manages to nearly defeat the two Sonics, their friends and allies show up to support them, thereby activating the power of the Chaos Emeralds and allowing the Sonics to transform into Modern Super Sonic and Classic Super Sonic. The super-powered hedgehogs proceed to confront the Time Eater in another dimension and manage to destroy it. The heroes then return to the present of Modern Sonic's dimension, with everything having seemingly returned to normal. There, the group continues to celebrate Modern Sonic's birthday. During the party, Modern Sonic thanks Classic Sonic for the team-up while Classic Sonic attempts to demonstrate the Boost. Although he fails, Modern Sonic encourages to continue working on it. Afterward, Classic Sonic and Classic Tails find a stray Time Hole for them to return home with. As the counterparts and the party guests then bid farewell to each other, Modern Sonic promises Classic Sonic a great future, just as Classic Sonic and Classic Tails pass through the closing Time Hole.
Meanwhile, Classic Eggman and Modern Eggman are lost in White Space. There, the two argue as they search for an exit and discuss about whether or not they ever defeat Sonic. Their discussion makes Classic Eggman contemplate if he should go back and get his teaching degree, which Modern Eggman thinks is not a bad idea since he loves telling people what to do.
|Sonic (Modern)||The world's fastest supersonic hedgehog is back again. He loves freedom, and hates anything unjust. Although he's short tempered at times, he can't leave anyone in need of help. He was about to enjoy his birthday until a mysterious creature appeared...|
|Tails (Modern)||Tails is a kid fox who can fly by spinning his two tails. He loves to work with machinery, and his inventions have helped Sonic many times.|
|Dr. Eggman||The evil genius of science is a long time rival of Sonic. Countless times he's challenged Sonic, but each time his ambitions are shattered. But how about this time...?|
|Time Eater||A mysterious monster that appeared out of nowhere. It created a mysterious maelstrom that blew Sonic's friends into another dimension.|
Sonic Generations is a platforming video game, with bits of gameplay taken from past Sonic games. The player takes control of either Classic Sonic or Modern Sonic, each with their own abilities and levels.
Sonic Generations is divided into nine stages, all of which are taken from past Sonic games, which are composed on two Acts, the first one with the player controlling Classic Sonic, and the second one having them playing as Modern Sonic. The goal of Sonic Generations is to beat the aforementioned Acts in the least amount of time as possible. These Acts are designed to make use of each character's abilities and branch into multiple paths that can offer the player more secrets to find. In addition, the player will unlock boss stages and Challenge Acts as they progress with the game, both of which have to be completed in order to progress with the story, although most Challenge Acts are optional.
During gameplay, the player will encounter obstacles and enemies. Also common are the Rings, which serve as the playable character's health. The number of Rings carried by the player is displayed in the top left corner of the HUD. As with past Sonic games, Rings serve as the playable character's main method of protection from damage; if the playable character takes damage while they carry at least one Ring, they will survive, though they will lose all their Rings. Conversely, taking damage while not holding any Rings will cost the player a life. The player will also lose a life if they drown underwater, get crushed, or fall into a bottomless pit. After losing a life, the playable character will respawn at the latest Star Post they touched, or at the start of an Act if they have not touched any Star Post. If the player runs out of lives, they will get a Game Over. Extra lives can be obtained by collecting 1-Ups or by gathering 100 Rings.
Sonic Generations also includes Skills, which are optional booster items the player can buy to get an advantage in levels, or get exclusive content. This can be done through the Skill Shop, which allows players to use points earned from high scores to unlock upgrades such as abilities, shields, and even the original Sonic the Hedgehog video game (console version). Completing challenges, as well as finding Red Star Rings hidden in each of the main Acts, unlocks additional Skills, as well as bonus concept artwork and music.
Classic Sonic has a 2.5D side-scroller gameplay, the same as that from the 2D Sega Mega Drive Sonic games, though with some modifications to be more adapted to the newer level design. As with the aforementioned games, Classic Sonic can run and jump as his most basic abilities. In addition, he can also Spin Dash while standing still to be launched at incredible speeds. Classic Sonic's Acts end when he touches a Goal Post at the end of the stage.
Modern Sonic's gameplay resembles that of Sonic Unleashed and the Wii version of Sonic Colors. Occasionally, the camera will shift between a side-view angle and a third-person angle, offering a 2.5D side-scroller gameplay and a 3D gameplay respectively. Like Classic Sonic, he can run and jump, those being his most standard abilities. However, he can also Boost to run at incredibly high speeds and destroy almost everything that is in his way, though this ability is limited and cannot be performed if the player's Boost Gauge is empty. Sonic can also perform a Homing Attack to reach nearby targets with ease, and slide to pass through small spaces with ease. Modern Sonic's Acts end when he touches a Goal Ring.
|Xbox 360||PlayStation 3||Classic Sonic||Modern Sonic|
|Left stick left/right||Move||Move/Grind Step|
|Left stick up||Look up|
|Left stick down||Look down/Crouch|
|Move + /Left stick down||Move + /Left stick down||Spin Attack||N/A|
|/Crouch +||/Crouch +||Spin Dash|
|(on wall)||(on wall)||Wall Jump|
Gimmicks and obstacles
- Sonic the Hedgehog
- Sonic the Hedgehog (Classic) (first appearance)
- Super Sonic (Classic) (first appearance)
Stages are divided into three eras, each representing games from a different generation of video game consoles. The "Classic Era" represents Sega Mega Drive games. The "Dreamcast Era" represents games from the Dreamcast, Nintendo GameCube, Xbox, and PlayStation 2. The "Modern Era" represents games from the PlayStation 3, Xbox 360, and Wii.
- Classic Era:
- Dreamcast Era:
- Modern Era:
In 30-second Trial mode, the player has to get as far as they can in a stage in thirty seconds. After time runs out, a sign post is placed in the spot where the player is standing. However, if they reach the goal before the time runs out (which is only possible through hacks), the mode abruptly ends without the score saved. They have the option to try again or continue playing to find the sign posts of their friends. They can also upload their score online and see which of their friends made it the farthest in one specific level.
In Time Attack mode, the player can see how fast they can clear a stage, a rival, or a boss fight, and can share their time in online leader-boards. In the console version, Time Attack can only be done online, and only the eighteen main Acts can be played for a top time.
Music can be unlocked by completing some Challenge Acts or collecting a number of Red Star Rings. The player can view his/her unlocked music by going to the collection room. The music for each stage in the game can be replaced by any unlocked music. In the 3DS version, they can only be heard in the extras menu.
There is a total of fifty unlockable songs:
Inside the media room, there lies a Statue Room where the player can collect many characters with various codes, even the regular enemies and four characters who didn't appear in the game otherwise. The room is accessible by holding Back/Select while in the collection room. These statues are:
|All Trophies Collected!||Collect all Trophies.||N/A|
|The Opening Act||Race through the first stage.||10|
|GREEN HILL Restored!||Restore the GREEN HILL Stage Gate.||15|
|CHEMICAL PLANT Restored!||Restore the CHEMICAL PLANT Stage Gate.||15|
|SKY SANCTUARY Restored!||Restore the SKY SANCTUARY Stage Gate.||15|
|SPEED HIGHWAY Restored!||Restore the SPEED HIGHWAY Stage Gate.||15|
|CITY ESCAPE Restored!||Restore the CITY ESCAPE Stage Gate.||15|
|SEASIDE HILL Restored!||Restore the SEASIDE HILL Stage Gate.||15|
|CRISIS CITY Restored!||Restore the CRISIS CITY Stage Gate.||15|
|ROOFTOP RUN Restored!||Restore the ROOFTOP RUN Stage Gate.||15|
|PLANET WISP Restored!||Restore the PLANET WISP Stage Gate.||15|
|Sunny Side Up||Defeat Death Egg Robot.||20|
|Perfect Punisher||Defeat Perfect Chaos.||25|
|Boom Boom Dragoon||Defeat Egg Dragoon.||30|
|Scrap Metal||Defeat Metal Sonic.||20|
|Shadow Boxing||Defeat Shadow.||25|
|Silver Got Served||Defeat Silver.||30|
|Treasure Hunter||Collect all the Chaos Emeralds.||20|
|All Stages Cleared!||Clear Sonic Generations.||50|
|Greased Lightning||Clear Green Hill Zone Act 1 within one minute.||10|
|Bright Star||Get Rank S in an Act.||15|
|Shooting Star||Get Rank S in three Acts.||20|
|Blazing Meteor||Get Rank S in seven Acts.||30|
|Blue Comet||Get Rank S in twelve Acts.||40|
|Big Bang||Get Rank S in all Acts.||50|
|Trickstar||Pull off a seven or more trick combo or six trick combo ending in a finishing trick.||10|
|Eradicator||Defeat 100 enemies.||15|
|Ring King||Reach the goal without dropping any of the rings you collected in Green Hill Zone Act 1.||15|
|Action Hero||Perform all of Sonic's moves in act 2.||10|
|Can't Touch This||Defeat the Time Eater without getting hit.||30|
|Bonds of Friendship||Complete all Challenge Acts featuring Sonic's friends.||10|
|Walkie Talkie||Chat with each of Sonic's friends you have saved.||10|
|Join the Ranks||Join the rankings.||20|
|A 30-Second Test||Participate in a 30 Second Trial.||20|
|Jump for Joy!||Find the spring hidden in GREEN HILL Act 1 and reach the goal with a Red Star Ring.||10|
|Walk on Water||Cleared CHEMICAL PLANT Act 2 without entering the water.||10|
|Walk on Air||Cleared SKY SANCTUARY Act 1 without falling and losing a life.||20|
|Byway or the Highway||Get the Red Star Ring located on the shortcut route in SPEED HIGHWAY Act 2 and reach the goal.||20|
|Demolition Derby||Wrecked 30 or more cars in CITY ESCAPE Act 2.||10|
|Secret Sleuth||Get the Red Star Ring located in the hidden room in SEASIDE HILL Act 1 and reach the goal.||10|
|Look Both Ways||Reached the goal in CRISIS CITY Act 2 without being hit by tornado-carried cars or rocks.||10|
|A Quick Breather||Get the Red Star Ring atop the highest spot in ROOFTOP RUN Act 2 and reach the goal.||10|
|Color Power!||Get the Red Star Ring by using an Orange Wisp in PLANET WISP Act 2 and reach the goal.||10|
|Supersonic!||Cleared a regular stage as Super Sonic.||20|
|Mad Skillz||Get all Skills from the Omochao shop.||30|
|(Hedge)Hogging It All Up!||Get all collectibles.||50|
|Time Attacker||Play Ranking Attack on all stages.||30|
|Red Ring Collector||Get all Red Star Rings.||30|
|Halfway Point||Clear half the Challenge Acts.||30|
|Mission Accomplished!||Clear all the Challenge Acts.||30|
|Intel Pentium Dual-Core T4200 2x2.0GHz / AMD equivalent||2GB RAM (Windows XP) / 3GB RAM (Windows 7/Vista)||NVIDIA GeForce 8800 512MB / ATI Radeon HD 2900 512MB||11.0 GB free hard drive space|
|Intel Core i5 2.66GHz / AMD Phenom II X4 3.0GHz||3GB RAM||NVIDIA GeForce GTX 460 1GB / ATI Radeon HD 5850 1GB||11 GB free hard drive space|
Development of Sonic Generations began in 2008 when Takashi Iizuka realized that there was no anniversary game planned for 2011. His idea for a tribute was accepted by Sega and developments began. Sega held an internal poll for their employees, including Sega of Japan, America, and Europe, asking what their favorite levels from the Sonic series were. After ranking the most popular levels, a website was launched holding another poll asking the opinions of fans of the series.
In late 2010, rumors of a Sonic Anniversary game surfaced online. The rumors told of a game that would potentially feature remakes of levels from throughout the series' history in both 2D and 3D. The game was alleged to be released on all major game consoles at the time: PlayStation Portable, PlayStation 3, Xbox 360, Wii, and Nintendo DS.
On 18 April 2011, Sonic Generations was finally announced for the PlayStation 3 and Xbox 360. A GameStop release list printed on 7 May 2011 showed a Nintendo 3DS port of Generations with a tentative release date of 31 December 2011. Later in the month, a Sega-Sammy earnings report listed Nintendo 3DS and PC versions of the game; however, a revised version of the report no longer listed either version. The June 2011 issue of Nintendo Power finally confirmed a 3DS version of Sonic Generations. It contained an in-depth preview and interview with Takashi Iizuka.
Sega officially announced a PC version of the game on 11 October 2011. This version was outsourced and developed by the British company Devil's Details.
A Sonic Generations demo was playable at E3 2011, under the name "Sonic Boom". It was the first major American Sonic event, being hosted by Sega, and took place on 8 June 2011 at 6pm PST. At E3, Sonic Generations was playable in both the HD and Nintendo 3DS versions. Although only Green Hill was playable for the console versions, City Escape was shown. There was also a Birthday Song for Sonic sung at Sonic Boom and the ending of the song, "Happy Birthday Sonic!" was heard in Sonic Generations. This song appeared at the Tokyo Joypolis event and at the Summer of Sonic event in London. It appeared at the Gamescom 2011 event in Germany, and at Tokyo Game Show 2011.
The Australian government’s OFLC rated a multi-platform demo release of Sonic Generations and Sega formally announced at E3 that they would release a demo for PlayStation Network and Xbox Live on Sonic's 20th Anniversary, 23 June 2011. The demo only contained Green Hill, and only the Classic Sonic playthrough. However, this demo also contained many unused files that revealed much about the full game, notably the stage list. The demo was only available until 12 July, at which point it was no longer available, including for players who had already downloaded it; the file essentially locked itself. In the Xbox Live version, one has to be an Xbox Live Gold Member to download the demo, although in the PlayStation Network version, a PlayStation Plus Subscription is not required. The name of the demo was: "Sonic Generations Green Hill Zone Demo #1", indicating another demo was on the way. Sega confirmed on their blog a second demo released in Europe for PlayStation Network and Xbox Live on October 18 and was released in North America for PlayStation Network on 25 October. The demo contains both Classic and Modern Sonic playable in Green Hill and has no time limit.
Classic Sonic is silent throughout the game, showing his personality through his actions and gestures.
For the first time, voice overs exist not only in English and Japanese, but also German, French, Italian and Spanish. The French voice cast (except for Vector) and the German voice cast (except for Shadow, Cream, Vector, Espio, Charmy and Rouge) all reprise their roles from Sonic X.
The music in the game was remixed by Jun Senoue and Tatsuya Kozaki, with guest remixes done by Tomoya Ohtani, Kenichi Tokoi and Naofumi Hataya (who remixed the classic versions of the Mega Drive stage themes), among others.
|Computer and Video Games||7.5/10|
|Official PlayStation Magazine (US)||8/10 (PS3)|
|Official PlayStation Magazine (UK)||8/10 (PS3)|
Sonic Generations has sold nearly over 3 million copies worldwide as of 30 April 2014, making it the fifth best selling Sonic game to date, behind Sonic the Hedgehog (over 4 million), Sonic Unleashed (also over 4 million), Sonic the Hedgehog 2 (over 6 million), and Sonic Heroes (also over 6 million).
The console and PC versions received generally positive reviews. Aggregating review websites GameRankings and Metacritic respectively gave the PlayStation 3 version 79.29% and 76/100, the Xbox 360 version 78.67% and 77%, and the PC version 78.43% and 77/100. IGN gave the game a score 8.5 out of 10 and an Editor's Choice award, praising the overall gameplay and the level design, while criticizing some occasional control issues and limited boss battles. Computer and Video Games gave it a 7.5 out of 10, praising the balanced design but criticizing the frame rate of the graphics. 1UP.com gave the game a "B" score, praising its variety, fun-to-play levels and interesting set-pieces, while criticizing some on-rails sections and occasional framerate drops.
Official PlayStation Magazine gave it an 8/10, calling it "a masterpiece of platform game design." GameTrailers gave the game a score of 8.1 out of 10, calling it "the best Sonic game in over a decade." GamesRadar gave the console version 8/10, calling it "the best Sonic game since Sonic 2," while they gave the Nintendo 3DS version a 7/10, praising its level design and optional missions but criticizing its short length as well as the fact that modern Sonic is restricted to a 2D plane of movement. Eurogamer, however, was less enthusiastic, writing that "Sonic Generations still doesn't do much to dissuade us that the hedgehog's best days are distant memories, but at least it is a worthy tribute to them." The most positive review on Metacritic is a 9.5/10 from PALGN, which argues that the game is significantly better than Sonic Unleashed, Sonic Colors, and Sonic the Hedgehog 4. Game Informer's Tim Turi was more critical of the game, criticizing Sega for "...shoehorning recent Sonic games, no matter how awful, into the 20-year timeline." He felt that such stages served "...only to remind you of how far the series has fallen from its original form." Famitsu praised the speed and addictiveness of the gameplay as well as the bonus material, while emphasizing that "you do need a certain amount of ability to play it the way it was meant." Empire gave the game 4/5 stars, saying "Generations is a nostalgic joy that captures the dizzying speed and psychotic pace that made Sonic's original romps console classics." GameSpot's Nathan Meunier praised Generations for its "impressive level designs," "gorgeous" visuals, "epic boss encounters," and high replay value.
Archie Comics made a video game tie-in for Sonic Generations in Sonic the Hedgehog #230, taking place within the In Another Time, In Another Place reality. It has also been stated that the events of the game happen in the Post-Super Genesis Wave timeline, and led up to Sonic & Mega Man: Worlds Collide.
Other homages to the series
- The underwater sections in Seaside Hill Act 1 bear features from Labyrinth Zone.
- The colors from Green Hill resemble the ones from the original version.
- If the player gets an "A" rank with Classic Sonic, he will do the pose from the box artwork of this game.
- The Buzzsaws in both Acts of Planet Wisp return from Scrap Brain Zone.
- In both Acts of Chemical Plant and Water Palace, there are waterslides that function the same way as the ones from Labyrinth Zone.
- In City Escape and Radical Highway, certain barrels are set up like the ones from Spring Yard Zone.
- Classic Sonic starts his idle animations with his foot tapping animation from this game.
- In both acts of Green Hill, there are corkscrew bridges resembling the ones in Emerald Hill Zone.
- In Classic Rooftop Run, the Gondolas return which came from Hill Top Zone.
- In both acts of Chemical Plant and Water Palace, there are waterslides that function the same way as the oil slides from Oil Ocean Zone (although they first appeared in Labyrinth Zone).
- When left waiting long enough without getting talked to in front of Green Hill, Modern and Classic Tails yawn like they first did in this game.
- Two of Classic Sonic's idle animations, one where he looks at a "watch" on his arm, and one where he impatiently lies back, come from this game.
- Classic Sonic's Crisis City has a 90-degree angle ramp like the "3D" upward ramps in Palmtree Panic's present.
- Classic Sonic's City Escape also has a similar ramp.
- In Classic Seaside Hill, there is a secret area along with a red ring, this was here to tribute the secret Angel statue which was found in Wacky Workbench's past.
- Act 1 of Seaside Hill and Water Palace contain references to parts of Hydrocity Zone, such as the grabbing poles and the small propellers.
- In Sky Sanctuary Act 1, there are platforms that fly as Classic Sonic runs on them. They will also wear out and stop working after running on one for too long. These are apparently based on the spinning blue tops from Marble Garden Zone.
- If the player gets a "C" rank with Classic Sonic, he will do the pose from the Japanese box art of Sonic the Hedgehog 3.
- In Sky Sanctuary Act 2, there are indoor areas that resemble Hidden Palace Zone.
- If Knuckles is saved by Modern Sonic, he says that it is good to have his sanctuary back, referencing its collapse.
- On certain challenges, Classic Sonic has to "juggle" the Goal Post to a certain area in the stage. This could be a reference to the functions of the Goal Post in Sonic 3 & Knuckles, as you can juggle the Goal Post in the air for as long as you can after it falls from the sky in Act 1 of each stage.
- One of Classic Sonic's idle animations, where he points ahead of the stage, comes from this game.
- When facing backwards, this idle animation changes to have Classic Sonic point behind him, instead of reusing the same animation as in the original.
- The skateboard item Classic Sonic uses in City Escape and the skill "Boardmaster" seems very similar to the board in Robotnik Winter Zone.
- One of Classic Sonic's idle animations, where he crosses his arms and quickly taps his foot, is based on Sonic's idle animation from this game.
- The "Finish" pose for Modern Sonic's Freestyle Tricks is a reference to the pose he does on the front cover of the original Dreamcast version of the game.
- In a mission in which Classic Sonic races Amy in Sky Sanctuary, Amy races by twirling her hammer around in her hands. This seems to reference her Spin Hammer Attack move from this game.
- Classic Sonic's skateboard has a similar design to the one from one of Sonic's artworks from this game.
- Just as an orca chased Sonic in the original Emerald Coast and its 3DS remake, a giant Chopper chased Sonic in the console remake of Green Hill.
- The tube waterslide in Chemical Plant works similarly to parts of Lost World.
- The tube waterslide in Chemical Plant works similarly to the one at the end of Cannon's Core.
- The cutscene before the fight with Shadow is almost an exact rendition of the opening cutscene from the Nintendo GameCube version of this game.
- After defeating the Biolizard, Sonic mentions that it was easy because he has fought it before, referencing the final battle of this game.
- Omochao helps the player by giving tips in every level, except for the final boss fight, where Sonic's friends give tips to beat the boss.
- In a mission in which Classic Sonic races Amy in Sky Sanctuary, Amy races by twirling her hammer around in her hands. This seems to reference one of her attacks from the game.
- In the Amy Co-op Mission in Chemical Plant, she uses her hammer to send up Sonic in the air. This was her partner ability in Sonic Advance 3.
- Sonic is able to call his friends to help him out with their special abilities in some of the missions. He was able to call them in Sonic Advance 3 as well.
- In the final battle, Sonic is able to throw his partner as a projectile to the Time Eater. This feature comes from the final battle of Sonic Advance 3.
- The fireworks that Classic Sonic uses at the end of Classic Tropical Resort are similar to the rockets in Toy Kingdom.
- The way the Sonics bounce on the balloons in Tropical Resort is similar to how Sonic and friends did in Toy Kingdom.
- The Spinning Tops in Sky Sanctuary Zone are references to the Spinning Tops in Chaos Angel (in terms of design, not functionality).
- The giant propellers from the second act of Mushroom Hill are similar to the ones from Frog Forest and Egg Fleet.
- The giant "Egg Wheels" from Casino Night look similar to the roulette from Casino Park.
- The special stages are re-imagined versions of the ones from this game.
- In a mission in which Classic Sonic races Amy in Sky Sanctuary, Amy Races by twirling her hammer around in her hands. This seems to reference her Propeller Hammer move from this game.
- The settings music is remixed from the character select screen theme of this game.
- The Freestyle Tricks Modern Sonic can perform are similar to the ones from this game. They give him boost energy, just like in Sonic Rush.
- Blaze is seen talking to Cream in Sonic's party, a reference to their friendship from this game.
- In the final battle, the Sonics combine their powers and start rotating in a circle to deliver the final blow. This is how the final battle of this game ended.
- Each Sonic having their own remix of the stage theme is just like how Blaze and Sonic both had their own remix of each stages theme in this game.
- Blaze mentions that there are rings similar to Red Rings in her dimension.
- The dolphins who help Modern Sonic in Emerald Coast are similar to the ones from Pirates' Island.
- The water cannons from Water Palace Act 1 are similar to the ones from Pirates' Island.
- The combo finisher Modern Sonic can perform originated from this game.
- The three rivals in Sonic Generations were part of Sonic's rivals from this game.
- If the player gets a "B" ranking as Classic Sonic, he will strike a pose that resembles Sonic's render pose from Super Smash Bros. Brawl.
- The tube waterslide in Chemical Plant works similarly to the one during Aquatic Capital.
- The texture of Sky Sanctuary Act 2 strongly resembles Astral Babylon.
- In a cutscene, Modern Sonic mentions "Rescuing genies in magic books."
- The skill system is similar to the ring system from this game.
- The Time Break ability in Sonic Generations is very similar to the Time Break in this game, where it originated from.
- If the player saves Rouge the Bat in City Escape as Modern Sonic, she will refer to him as "Big Blue," which was her nickname for Sonic in Sonic Chronicles: The Dark Brotherhood.
- If the player gets a B rank with Modern Sonic, he will do one of the poses of his artwork from this game.
- The skydiving tunnels in Modern Chemical Plant and the Egg Dragoon boss are a reference to the original Rooftop Run and Eggmanland stages.
- There is a cylinder-climbing section in Crisis City that works like Mazuri's tree section, in which the player needs to climb the right platforms to continue on, otherwise they may find themselves stuck in an endless loop.
- In both acts of Rooftop Run, the flags of all the nations Sonic visited in Unleashed are visible at some point.
- The village in the background of Water Palace looks similar to Apotos.
- After Modern Sonic gets out of a water slide in Water Palace, he begins to surf, referencing that he was able to do that in the Wii/PS2 version of this game.
- Modern Sonic enters Casino Night falling from the sky, just like he did in every daytime stage in the Wii/PS2 version of this game.
- Wentos' Chao puppets are seen hanging in the Skill Shop.
- This game uses the Homing Attack lock on icon from Sonic Unleashed'.
- As well as mentioning genies and magic books, Modern Sonic also mentions "saving aliens in an interstellar amusement park" in the same cutscene.
- Silver appearing in Tropical Resort is also a reference to the Nintendo DS version of the game, since he was wandering around the park with Blaze in that game.
- Near the end of Modern Rooftop Run, the Battery Blimp attacks in the same way as the Frigate Orcan and Skullian except it can't be destroyed. However, it leaves a trail of rings after it takes enough hits, just like both bosses did in Sonic Colors.
- If the player gets an A rank with Modern Sonic, he will do one of the many poses that he has in Sonic Channel.
- Most of the statues are based off the character artwork from here.
- The internet poll asking fans what their favorite stages from each mainline Sonic game were also listed stages from Sonic and the Secret Rings and Sonic and the Black Knight, suggesting that at one point in development, stages from both games were meant to appear in Sonic Generations but were scrapped later on.
- Because Sonic Colors was not announced yet at the time the poll was released, none of its stages appeared in the poll.
- There are some differences between the console and the PC version of Sonic Generations. First of all, the PC version has more shadows and the colors are slightly less vibrant than on the console version. The maximum framerate for the PC is 60 FPS while it is locked to 30 FPS on consoles (without FPS Boost enabled for the Xbox 360 version). The loading times are also greatly decreased in the PC version, as well as the Xbox 360 version running on Xbox One and Xbox Series X and Series S, and it lacks the Sega Genesis Controller.
- However, the Sega Mega Drive version of Sonic the Hedgehog runs at 60 FPS in the console version (even with FPS Boost enabled for the Xbox 360 version).
- Also, in the PC version and the Xbox 360 version via FPS Boost, all cutscenes, including boss intro cutscenes and boss outro cutscenes as well as the Saving A Friend cutscenes, are locked at 30 FPS.
- In the PS3 version, Motion Blur was disabled.
- The textures for Planet Wisp's environment map are actually screenshots of the team's dev program.
- All Challenges against friends in the first era are races.
- Tails is the only character who races against Modern Sonic. Knuckles and Amy race against Classic Sonic.
- This is the first 3D Sonic game not to have a unique theme song.
- Like the Wii/PlayStation 2 version of Sonic Unleashed, while using the Boost on a Dash Panel, Sonic performs a Spin Dash animation.
- In both Sonic & Knuckles and Sonic Generations, the Death Egg can be seen in the background of Sky Sanctuary. In Sonic & Knuckles, the next level is Death Egg Zone, and in Sonic Generations, the next level is the fight against the Death Egg Robot, which coincidentally takes place in the Death Egg.
- The game's box artwork has a white colored accent on top and bottom.
- The rivals in this game appeared as playable characters in Sonic Rivals.
- Knuckles is the only rival from Sonic Rivals that is a friend in Sonic Generations, as the others are all rivals that battle Sonic.
- The drowning countdown starts at 4 instead of 5, although a different tone is played before the countdown starts. Underwater warning beeps are also much more prominent.
- After Sonic saves Tails, he makes a reference, saying that Green Hill was "awfully familiar," followed by Tails saying that he does not recognize the stage at all. This most likely references the fact that Green Hill Zone is a Sonic the Hedgehog stage, and Tails was introduced in Sonic the Hedgehog 2.
- This is the second 3D Sonic game where Eggman is the final boss.
- Out of all nine main stages, three of the stages are based on the first levels of their respective games (Green Hill, City Escape and Seaside Hill). To a lesser extent, Crisis City is also considered a starting level in Silver's story, and Speed Highway is the first Action Stage in Knuckles' story.
- This is the second main 3D game to have someone (Classic Tails, specifically) call Dr. Eggman the name "Dr. Robotnik," the first being Sonic Adventure, which was the game where Eggman got his nickname.
- This is the second 3D Sonic game in which the player starts a new game and are taken to the first stage, rather than showing the cutscene first. The first game to do this was Sonic Colors.
- History of the 1st Stage Original Soundtrack White Edition is the Japanese pre-order bonus for the game, not the soundtrack as originally thought. It is a disk with the music from the Sega Mega Drive games.
- Coincidentally, Shadow's line from his own game, "Where is that damn fourth Chaos Emerald?" is also referenced, as he has the fourth Chaos Emerald of the game.
- Takashi Iizuka said that three original taglines for the game were "Blast with the past", "Déjà Blue", and "A speedy trip down memory lane."
- With the exception of the Egg Dragoon, all of the bosses in Sonic Generations only take half the amount of hits the bosses in the Nintendo 3DS version can (four in the console/PC version, eight in the Nintendo 3DS version).
- In White Space, Sky Sanctuary has trees with grapes in them. Knuckles' favorite food is stated to be grapes in the Sonic the Hedgehog 3 manual, and Sky Sanctuary is also where Knuckles is saved in Sonic Generations.
- When an S rank is achieved on one of the levels or bosses, the text color of the title of it turns golden.
- The unlockable music list has slight remixes of the Classic Sonic songs (mainly Sonic the Hedgehog 3 and Sonic & Knuckles).
- After a stage is restored, a level's background noise can be heard, faint from the normal background music. This is easily heard when muting the music:
- Green Hill, sounds of the waterfalls and bird songs are heard.
- Chemical Plant, sounds of construction are heard.
- Sky Sanctuary, loud bird songs are heard
- Speed Highway, moving, honking cars are heard.
- City Escape, crowds talking are heard.
- Seaside Hill, sounds of a beach are heard.
- Crisis City, sounds of volcanic explosions are heard.
- Rooftop Run, faint crowds are heard.
- Planet Wisp, a mix of bird songs and construction is heard.
- The Death Egg Robot is the only boss originally fought by Sonic as himself. Perfect Chaos was fought by Super Sonic and the Egg Dragoon was fought by the Werehog.
- This is the second game to use skill customization, the first being Sonic and the Secret Rings.
- The PC version downloadable from Steam is always based on the PAL version, even in North America. This is confirmed due to "Colors" being spelled "Colours".
- During the credits, the original levels from each game play along with the music medley as a tribute to the original games. The following game versions were used: the original Japanese Sonic Adventure release on Dreamcast, Sonic Adventure 2: Battle, the PC version of Sonic Heroes, the PlayStation 3 version of Sonic the Hedgehog (2006), the Xbox 360 version of Sonic Unleashed, and the Wii version of Sonic Colors. There are no obvious indications if the Mega Drive games are originals or direct emulations (or even Sonic Jam). Oddly enough, even though the credits use the revised Japanese version of the original Sonic the Hedgehog, the unlockable emulation in console versions is the original American release.
- Sonic Generations was held on a 66% discount on Steam via PC Download as a Daily Deal due to the large amount of downloads.
- In the Collection Room, two of the cutscenes the player can view are both named "Eggman Abducted", both being the cutscene after beating the Death Egg Robot and the Egg Dragoon.
- The rival and boss battle of the Dreamcast Era mainly used the Boost throughout the fight which was introduced later in the series.
- Not long before the release date of Sonic Generations, Sega sponsored a skateboarding sporting event that took place in Venice Beach of California named "Sonic Generations of Skate".
- The Silver the Hedgehog boss battle is the only recreated/reimagined boss in the game that was not based off a second-to-last or final boss. Metal Sonic, Egg Emperor, and the Egg Dragoon are boss battles that are second to last while the Death Egg Robot, Big Arm, Shadow the Hedgehog (final boss of Hero story in Sonic Adventure 2), and Perfect Chaos are all final bosses to their story modes and games.
- When looking at the models on the character profiles, both Silver and Rouge strike the same poses.
- If the player views the entire White World in a 3D model viewer, if they zoom out and look around, the entire Crisis City level will be there.
- Despite the game giving Super Sonic a theme, (it being an instrumental remix of the Sonic the Hedgehog 4: Episode I theme) it only plays during the final phase of the Time Eater boss fight, and a variant of it plays in the cutscene prior to the fight.
- When booting up the PlayStation 3 version of this game, some of Sonic's sprites from the original Sonic the Hedgehog are used before the Sega motto loads up.
- The physics engine is actually a modified version of the Sonic Unleashed engine. Hacking into the game can restore properties found within Sonic Unleashed, including light shafts, motion blur, and directional shadows.
- On July 14, 2015, Sega posted a video of the cutscene played before the final battle, adding in footage from a motivational speech video featuring actor Shia LaBeouf. That speech came from #INTRODUCTIONS.
- In the "Ending" cutscene, the dialogue between both Classic and Modern Tails is different between the English and Japanese scripts. In the English script, Classic Tails asks Modern Tails where Sonic puts all of his collected Rings. In the Japanese script however, Classic Tails asks his Modern self how he could add legs to Sonic's Tornado model.
- Sonic Generations is the fourth main game to have all four hedgehog main characters presented (Sonic, Amy, Shadow and Silver). The others before this being Sonic the Hedgehog (2006), Sonic Rivals and the Nintendo DS version of Sonic Colors.
- This is the only game dubbed in French, Spanish, German, and Italian to not have the Wisp announcer voiced in those languages, with the game using its English voice instead.
- Aaron Webber mentioned in an interview that if anyone were to voice Classic Sonic, his personal favorite would be Jaleel White. Aaron also mentioned that he grew up with the classic Sonic cartoons, and he thought Jaleel White did a fantastic job. Jaleel White has stated that he was not approached by Sega to voice Classic Sonic.
- Voice used exclusively in the battle against the character.
- Voice used exclusively in game scenes.
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