Games that need a sequel

[droginator]

Sonic Battle 2. God, that was one of the best Sonic GBA games I ever played. The thousands of characters that SEGA's come up with should be used to add even more replay value.

Yeah, Sonic Battle was awesome. But will adding more characters make it much better?

Sonic Adventure 2

Wasn't Shadow the Hedgehog kind of a sequel for that? Sonic Adventure 2 was the best 3D Sonic game I ever played. I'd love it if they could replicate that, comparing it to the newer games.