Sonic The Hedgehog is an online MASTER game that you can play at Emulator Online. This free Sega Master System game is the United States of America region version for the USA. Sonic The Hedgehog is a single title from the many platform games, arcade games and sonic games offered for this console. If you enjoyed playing this, then you can find similar games in the master games category. Sonic The Hedgehog game is from the various retro games on the site, and there are more games like this, including Sonic Mania Edition, Sonic the Hedgehog 3 and Sonic Advance 3.