Shakka To Tamborine, A Game which looks mysteriously similar to Samba De Amigo, was reported as a game made by Sonic team themselves. However, during a chat with some top japanese blokes (I'm in their Chat! WHEE! and with My Translator on ;P) which I think include members of the Sonic Team themselves (although I don't think they even noticed that I posted links to Sonic BETA shots :)) That Skahha is NOT made by Sonic Team, but a Mystery Developer, who is most probably using the same engine.

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And while chatting, it has come to me that the Japanese are much more calmer in Chats then in english speaking chats, where you have trash talk. Also they aggree that The SonicTeam USA seem to be Lazy with their live Camera, and that Ozisoft are not very good :D