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Sonic & Knuckles
Knuckles, along with arch-nemesis Dr. Robotnik, was Sonic's main adversary in Sonic 3, but this time he's on your side. If you're familiar with any of Sonic's games, you already know that the blue hedgehog offers the fastest and most frantic platforming series around. With the addition of Knuckles, SEGA added new moves and multiple story paths to the menu.