Sonic The Hedgehog ROM Download for Sega Master System (Sega Master) on Emulator Games. Play Sonic The Hedgehog game that is available in the United States of America (USA) version only on this website. Sonic The Hedgehog is a Sega Master System emulator game that you can download to your computer or play online within your browser. You can also download free ROMs such as Sonic The Hedgehog 2, Sonic Chaos and Sonic Blast as shown below. Sonic The Hedgehog works on all your devices in high quality.