Proto:Sonic Generations (PlayStation 3, Xbox 360, Windows)
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This page details one or more prototype versions of Sonic Generations (PlayStation 3, Xbox 360, Windows).
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| 20 Day Demo|
Released on Sonic's 20th Anniversary (June 23, 2011), this demo was available for download and use for 20 days. Notable for having a completely playable yet inaccessible Act 2 plus all the level names.