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).
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