Sonic the Hedgehog was once so popular he was more recognized worldwide than Mickey Mouse. True story. But SEGA's speedy mascot has fallen on hard times of late. Great Sonic titles have been rare over the past few years, but SEGA is hoping to change that with Sonic Unleashed. The latest Sonic builds on the ideas of Wii's Sonic and the Secret Rings, but adds some gameplay refinements and one big howler of a twist.