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Wikipedia[1][2] (Final Fantasy Adventure and Mana series articles) give the Japanese Game Boy release as 28 June 1991; the Japanese date is used as the first release.Square released the action RPG Seiken Densetsu: Final Fantasy Gaiden on Game Boy in Japan on 28 June 1991; it reached North America as Final Fantasy Adventure in November 1991 and became the first game in the Mana series.
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