The Black Onyx 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. The Black Onyx is a single title from the many adventure games, arcade games and action games offered for this console. If you enjoyed playing this, then you can find similar games in the master games category. The Black Onyx game is from the various retro games on the site, and there are more games like this, including Pokemon Black Version, Pokemon Onyx Blue and Call of Duty: Black Ops.

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