Summary [Xbox Live Arcade] The blue hedgehog and the red echidna were sworn adversaries in Sonic 3, but in the platform adventure Sonic & Knuckles, Knuckles realizes that he's been just a pawn in the schemes of Dr. Eggman (aka Dr. Robotnik). Knuckles, the former adversary, now supports Sonic to chase the common enemy, and each must use their st...