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Sonic Generations, known in Japan as Sonic Generations: Shiro no Jikuu ("White Space-Time"), is a 2.5D/3D platformer developed by Sonic Team (Company) and published by Sega (Company) for the Xbox 360 (Platform) and PlayStation 3 (Platform) in North America on November 1, 2011, in Europe on November 4, 2011, and in Japan on December 1, 2011. It also received a digital PC (Platform) release, ported by ported by Devil's Details and released in North America on November 4, 2011 and in Europe on November 25, 2011, with no Japanese release.
Created to celebrate the 20th anniversary of the Sonic the Hedgehog (Franchise) franchise, the game features remade levels from mainline Sonic games (three from the "Classic" '90s era, three from the early 2000's "Adventure" era, and three from the late 2000's "Modern" era), with players running through each stage as Sonic the Hedgehog (Character) in two ways: in classic 2D perspective as "Classic Sonic", and in modern 3D perspective as "Modern Sonic".
The game's story, set sometime after the events of Sonic Colors (Game), has Sonic and his friends being sucked into various "time holes" by a mysterious new being, scattering them into different places in history. As Sonic is thrown back to his early days in Green Hill Zone (Location), he encounters a younger, less talkative self (resembling his earlier design) and together, they must rescue their friends while finding out who is the true mastermind behind the mysterious Time Eater.
Along with several unlockables and references to the '90s era of Sega games, Sonic Generations features several bonuses, with the 360 and PS3 versions including a playable version of the the series's first game and the option to play in stereoscopic 3D.
The game also received a separate handheld adaptation, known in Japan as Sonic Generations: Ao no Bouken ("Blue Adventure"), developed by Dimps, and published by Sega (Company) for the Nintendo 3DS (Platform) in North America on November 22, 2011, in Europe on November 25, 2011, and in Japan on December 1, 2011. While the story remains the same, this version features a new selection of levels while switching the gameplay of "Modern Sonic" to 2D platforming similar to Sonic the Hedgehog 4: Episode I.
The 360/PS3 version later received a remastered release in 2024 as Sonic X Shadow Generations (Game), including a bonus campaign starring Shadow the Hedgehog (Character).
Gameplay is broken up between two versions of Sonic. The 1990's-era-based "Classic Sonic" sees levels from a strictly side-scrolling perspective, with many of the game mechanics being pulled directly from the series' 16-bit heritage. "Modern Sonic" on the other hand borrows more heavily from games like the Sonic Unleashed titles and Sonic Colors Wii, with boost-focused gameplay punctuated by perspective shifts between side-scrolling and behind-the-back 3D. A 2D hub world exists between stages, allowing players to pick between levels by walking up to that stage in the environment and cycling through a menu of available "Acts".
Though "Classic Sonic" and "Modern Sonic" are the only playable characters, after completing the main two acts of a stage, Sonic rescues one of Sonic's many friends, who hang around in the hub world and challenge Sonic to complete optional side missions. Each act has 10 challenges attached to it (5 as "Classic Sonic", 5 as "Modern Sonic"). Beating these will unlock additional music and artwork, as well as restore that particular hub area back to normal by returning color to it.
Each zone includes a main act for both Classic Sonic and Modern Sonic. Essentially, Sonic Generations features 9 Classic Sonic stages and 9 Modern Sonic stages, not counting side acts and boss encounters.
Each zone and boss is based on a level or boss from a previous Sonic title. As coinciding with the anniversary theme of Sonic Generations, the player is essentially taken on a tour through 20 years of Sonic's history.
The Nintendo 3DS (Platform) version of Sonic Generations has, for the most part, separate levels from the console/PC release. Though the game's producer Takashi Iizuka originally mentioned the 3DS version would pull from Sonic's Gameboy Advance and Nintendo DS (Platform) entries, the vast majority of the levels are still largely from Sonic's console outings, save for a single level from Sonic Rush (Game).
Each zone includes a main act for both Classic Sonic and Modern Sonic. Essentially, the 3DS Sonic Generations features 7 Classic Sonic stages and 7 Modern Sonic stages, not counting side acts and boss encounters.
To celebrate the 20 years of the hedgehog, Sega released a limited collector's edition. These were released in European regions for the Xbox 360 and PlayStation 3 and included: