A complete conversion of Sonic Adventure 2 from the Dreamcast, with additional features exclusive to the GameCube.

Play as either Sonic, Knuckles and co. or the evil crew of Dr. Eggman, Shadow and Rouge through a total of 150 missions across 30 levels. As Sonic's team, you must stop Dr. Eggman from taking control of the Chaos Emeralds, and as Dr. Eggman's team, you must hold Sonic at bay while collecting all of the Emeralds to take full control of the planet.

Exclusive to the GameCube are improved visuals, new 2-player battle games (including Kart Racing, Hunting and Chao Karate) and the ability to grow Chao and exchange them to the Game Boy Advance game Sonic Advance for portable training.