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Phantasy Star (ファンタシースター) is a 1987 role-playing game developed and published by Sega. It is the first in a long line of Phantasy Star games, and is often considered one of the best games for the Sega Master System.
In 1994, Sega released a version for the Sega Mega Drive, Phantasy Star Fukkokuban (ファンタシースター 復刻版). This version is merely the Master System version on a Mega Drive cartridge PCB with the appropriate connector pin to signal Master System mode changed accordingly (which is how passthrough devices like the Power Base Converter work). The situation behind this release is unknown; the most prominent rumor is that it was a contest giveaway.