Play the classic platforming and running video game that started all the modding hype. Play as Sonic and defeat Dr. Robotnik in Sonic The Hedgehog! Sonic The Hedgehog is a popular platforming video game that was released back in 1991 for the Sega Genesis gaming console system. The game centers around the blue hedgehog named Sonic. Sonic has the ability to run so fast that he can even defy physics for a time. The game focuses on Sonic's quest to defeat Dr. Robotnik and stop his evil schemes. The game was so popular that it spawned dozens of sequels and even hundreds of ROM hacks.