Excerpt: Sonic Adventure 2: Battle is a port from the Dreamcast title with a few extra levels in the multiplayer. One of the nice additions is the ability to raise your Tomagachi-like Chao on the GameBoy Advance (if you have the Sonic Advance cart), instead of the Dreamcast's smaller VMU. Right off the bat, players can choose to play through the story mode as either the good guys or the bad guys.
Pros: Variety of levels, Lots of replay, Two separate story lines
Cons: Camera provides biggest challenge, Not enough of the Sonic/Shadow levels, Without a GBA and Sonic Advance, Chao levels are, seless, imited*