Here are the Sonic games for the Wii:
Sonic and the Secret Rings,
Mario and Sonic at the Olympic games,
Sonic Unleashed,
Sonic and the Black Knight,
Sonic Riders Zero Gravity,
Sonic Colors,
Sonic & SEGA All-Stars Racing,
Sonic made an appearance in Super Smash Bros. Brawl, but that's not an actual Sonic game.
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No.
yes, you can play any of your gamecube games ont he wii
Sims castaways, My sims, sonic colors, Mario
No. Shadow has appeared in:Sonic Adventure 2/2 Battle (Dreamcast and Gamecube.)Sonic Battle (GBA)Sonic Heroes (Xbox, PS2, Gamecube, PC)Shadow the Hedgehog (Xbox, PS2, Gamecube)Sonic Riders (Xbox, PS2, Gamecube, PC)Sonic Riders: Zero Gravity (PS2, Wii)Sonic Free Riders (Xbox 360 Kinect)Sonic Chronicles: The Dark Brotherhood (DS)Sonic and the Black Knight (Wii)Sonic and the Secret Rings (Wii)Mario and Sonic at the Olympic Games (Wii, DS)Mario and Sonic at the Winter Olympic Games (Wii, DS)Sonic Rivals (PSP)Sonic Rivals 2 (PSP)Sonic the Hedgehog (Xbox 360, PS3)Sonic Colors (DS version only)SEGA Superstars (PS2)SEGA Superstars Tennis (PS2, PS3, Xbox 360, Wii, DS)SEGA All-Star Racing (PS3, Xbox 360, Wii, DS)Shadow also appears in Super Smash Bros. Brawl (Wii) as an assist trophy for Sonic.
There are many good racing games in Wii like Mario Kart Wii, Sonic & Sega All Star Racing, Excite truck and Track Mania