Dr. Robotnik is back and he has a new ally to help him defeat you in Sonic the Hedgehog 3. Go to an adventure in a mystical floating island that caters your enemy. Sonic the Hedgehog 3 is a platform video game and the fourth main game in the Sonic the Hedgehog series that was released for the Sega Genesis in 1994. In this game, you will play the role of Sonic the Hedgehog and Miles âTailsâ Prower to defeat the Dr. Robotnik and destroy his evil inventions. The game begins after the events of the previous installation of the game where Dr. Robotnikâs Death Egg crash-lands on the Angel Island. Dr. Robotnik meets the guardian of the Master Emerald, Knuckles the Echidna, and tricks him to fight against Sonic.