Black Onyx, The ROM Download can be obtained free for Sega Master System on EmuGames.net only. Play emulator game in English for the USA region. Black Onyx The is a Sega Master ROM that you can download to your computer or play online within your browser. You can also download roms such as Call Of Duty Black Ops and Pokemon Black Special Palace Edition 1 By MB Hacks Goomba V2.2 that work on all devices including desktop and mobile. Be sure to rate the game if you enjoyed playing this ROM.