Sonic is the cool blue porcupine, who has to run around in a 2D world to collect rings, kill robots by jumping over their heads and, most important of all, gathering up the furry animals you meet during the game to free them. Chose Sonic Tails or Knuckles and go on your quest to stop Metal Sonic from blowing up the planet. After completing the game, you might unlock the secret levels and characters for even more fun.