ClassicSegaOnline.com is the premier online destination for playing classic Sega Master System and Sega Game Gear games like Sonic the Hedgehog, OutRun, Columns, Legend of Illusion Starring Mickey Mouse, Ecco - The Tides of Time and many other great Sega games, whether they be imported, homebrew, or even the elusive unreleased games.

Unlike similar websites, ClassicSegaOnline.com is able to provide classic Master System & Game Gear games legally. We can only provide you with games that we have an original cartridge of, which have either been bought out of pocket or kindly donated by Players Like You™. If we don't have the games in our possession, we can't have them online.

Source: Here