SEGA announces that Sonic Generations has rolled into North American stores for Windows PC, Xbox 360, and PlayStation 3, offering the latest adventures of the hyperactive hedgehog. The game can also be acquired without running to the store, as it has now unlocked on Steam. Here's word:

Sonic Generations features Sonic the Hedgehog playable as both the much loved classic 1991 character and the modern day video game hero he has become. In this new fast-paced adventure set across three defining eras from 20 years of Sonic the Hedgehog, consumers can now speed through some of the most iconic environments, playing as Classic Sonic and as Modern Sonic in all new, stunning re-imagined levels. In Sonic Generations, Sonic the Hedgehog is back in a time-bending adventure where he must defeat a mysterious new enemy that has sent him and his friends through a time hole. There, Sonic meets his classic self, and they must battle back through his history to rescue his friends and find out who is behind it all.