Sonic Generations

is a platform video game, developed by Sonic Team and published by Sega for PlayStation 3, Xbox 360, and Microsoft Windows. The Nintendo 3DS version of the game was developed by Dimps. The game commemorates the 20th anniversary of the Sonic the Hedgehog series, and was released in November 2011 in North America, Europe and Australia, and in Japan the following month. On July 2, 2012, the game was made available for digital download on PlayStation Network, and was made available on the Games on Demand service on October 16, 2012. It is also available on the Nintendo eShop.