Sonic the Hedgehog is a platform video game that was released in 1991 for the Sega Master System and the Game Gear. It is distinct from the more popular 16-bit game. In addition to its original release as a cartridge, the game was later built into some versions of the Sega Master System II in Europe.
In 2008 it was also re-released for Wii Virtual Console in North America on August 4, 2008 and in Europe on September 19, 2008. The Game Gear version has appeared with other titles on Sonic Adventure DX for GameCube and PC and Sonic Mega Collection (Plus) for GameCube, PlayStation 2, Xbox and PC.