The world's favorite blue hedgehog returns for a next-level adventure in Sonic the Hedgehog 2. Having settled in Green Hills, Sonic is eager to prove he has what it takes to be a true hero. His challenge comes when Dr. Robotnik returns, this time with a new partner, Knuckles, in search of an emerald with the power to destroy civilizations. Sonic teams up with his friend Tails and together they travel the globe to find the emerald before it falls into the wrong hands.