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Sonic Turbo Adventure is an upcoming Nintendo DS game made by Crossover Kirby. There will be characters from other games series, and is heavily rumored to have downloadable content via the Nintendo Wi-Fi Connection. More information will be revealed in F3 2009.
A new character named Tomomi has been hinted to appear, but no further details were given.
So far, Sonic is the only confirmed character to be playable. The game uses 3D graphics, and switches between 2D and 3D like the daytime stages in Sonic Unleashed. It is currently unknown if there will be any other playable characters, and if so, if they will have different gameplay.