Sonic the Hedgehog is a 1991 platform game. It is a companion to the 16-bit Sega Genesis game Sonic the Hedgehog for the 8-bit Master System and Game Gear consoles. Ancient—a studio founded by composer Yuzo Koshiro for the project—developed the game and Sega published it to promote the handheld Game Gear. The 8-bit Sonic is a side-scrolling game...