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Classic Game Room reviews the Sega FM Sound Unit for Sega Mark III (the Japanese Sega Master System). The FM Sound Unit unlocks new, secret soundtracks contained within Sega Mark III video games like Fantasy Zone II, Opa Opa, Shinobi, Out Run and more!
The Sega Mark III FM Sound Unit YouTube review shows Sega FM Sound Unit review footage of this Sega Mark III add on and Sega Master System to Sega Mark III converter in action.