Play MASTER Games Online in high quality. All the retro Sega Master System games for the retro gamer, we have over 159 MASTER games in our collection. Start playing your favorite MASTER emulator games now and use the menu on the right to browse our game collections. Feel free to comment on and upvote the best MASTER games you enjoyed playing! Begin by playing popular Sega Master System titles like Sonic The Hedgehog, Sonic Blast, Sonic Chaos and Alex Kidd in Miracle World.