The inhabitants of South Island are in danger! Dr. Robotnik has stolen all the Chaos Emeralds which kept the power balance. Robotnik has thrown the Emeralds in a parallel universe and is keeping the red one. Sonic and Tail must retreive all the Chaos Emeralds before the destruction of South Island. This is the first Game Gear game where you can play either Sonic or Tail. [Instructions] Use the left and right arrow keys to move left and right. Press the Spacebar to jump. To spin-dash, press and hold the down arrow key, then press the Spacebar, then release the down arrow key. It may take a few seconds for the game to load!