The Internet is awash with whispers and hearsay about a new Sonic game called Sonic Unleashed.
Reports say it will be a mix of 2.5D platforming with the kind of running seen in Sonic and the Secret Rings. The target platforms are unknown, but are likely to include Wii.
There's also speculation about a storyline where Sonic becomes afflicted with a curse, turning him into a werewolf at certain points in the game. A new character may make an appearance too, a brown hedgehog. Some, or all of this could be false.
A video, which was supposedly leaked can be seen here:
CAUTION: Do not watch this video if you are offended by really annoying music.
*UPDATE* - Sega of America seem to be taking most of these videos down from YouTube, so it's likely this stuff is genuine.
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