It is impossible to say because there is always another sonic game.
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Nobody knows, the game hasn't come out yet.
In Sonic Heroes for the PS2 and I think Sonic The Next Generation or something.
Sonic the hedgehog is a video game to Xbox360 and Playstation3. the game is also called Sonic Next-Gen or Sonic 06 to not be mixed up with the first Sonic game.
The new sonic game is called project needlemouse
The first game called sonic the hedgehog from 1991