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. Gameplay is broken up between two versions of Sonic. A playable version of the original Sonic the Hedgehog is also unlockable for the Xbox 360 and PlayStation 3 versions of the game. The game features unlockables (such as concept artwork) and references to the 90s era of Sega games.

Together, they must rescue their friends (including a younger Classic Tails) and find out the true mastermind behind the mysterious Time Eater.

As Sonic is thrown back to his early days in Green Hill Zone, he encounters a younger, less talkative self (known in the game as Classic Sonic). The story, set sometime after the events of Sonic Colors, has Sonic and his friends being sucked into various 'time holes' by a mysterious new being, scattering them into different places in history. Created to celebrate the 20th anniversary of the Sonic the Hedgehog franchise, the game features remade levels from mainline Sonic games ( Sonic the Hedgehog, Sonic the Hedgehog 2, and Sonic & Knuckles for the 'Classic' era Sonic Adventure, Sonic Adventure 2, and Sonic Heroes for the 'Adventure' era and Sonic the Hedgehog (2006), Sonic Unleashed, and Sonic Colors for the 'Modern' era), in which players run through each stage in two ways: in classic 2D perspective as Classic Sonic, and in modern 3D perspective as Modern Sonic. Sonic Generations is a hybrid 2.5D/3D platformer developed by Sonic Team and published by Sega for the Xbox 360 and PlayStation 3 (November 1, 2011), PC (via Steam, November 3, 2011, ported by Devil's Details), and Nintendo 3DS (November 22, 2011, developed by Dimps). Overview Welcome back to Green Hill Zone!

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