"Sonic and Dr. Eggman have dueled for over ten years now! In that time Sonic and the Freedom Fighters have enjoyed the safety and comfort of their home, Knothole--once a tiny village and now a sprawling city! But the doctor is about to step up his game. "Eggman Empire" is the story of evil triumphing over good, and the heroes' struggle to fight back. As Dr. Eggman unleashes all of his might against our heroes, will they be able to endure?"--Page 4 of cover.