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Dr. Hello is an unlicensed Sega Master System puzzle game developed and published by Sis. A port of the popular 1990 Nintendo Family Computer game Dr. Mario, it was released exclusively in South Korea in December 1992. Like the majority of unlicensed South Korean Sega Master System games, Dr. Hello is actually an Sega SG-1000 game, and utilizes the Master System hardware's backwards compatibility to operate on the system.