Sega Galaga ROM Download for Sega Master System (Sega Master) on Emulator Games. Play Sega Galaga game that is available in the United States of America (USA) version only on this website. Sega Galaga 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 Sega Rally 2 - Sega Rally Championship, Sega Rally Championship (Europe) (Made In USA) and Sega Smash Pack as shown below. Sega Galaga works on all your devices in high quality.