Sonic Generations

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Based on the search results, the Sonic the Hedgehog 20th Anniversary was a celebration throughout 2011 marking two decades since the release of Sonic the Hedgehog in 1991. This anniversary included various releases and merchandise:

Games and Apps:

A free-to-play iOS app developed and published by Sega A PC Pack featuring a Sonic Mouse, Mouse Mat, and four Sonic games

Other Celebration Content:

Merchandise including figures by Jazwares, Good Smile Company, and Medicom Toy Multiple soundtrack albums from classic and modern Sonic games Events like the Macy's Thanksgiving Day Parade Sonic Balloon and Summer of Sonic Comics and various promotional items

If you're looking for information about a specific Sonic 20th Anniversary game or product, or if you'd like me to help translate this description (given the special instructions in my system), please clarify your request and I'll be happy to help.