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Pokemon Picross for the Game Boy (Color) was an unreleased Pokemon spin-off game, announced in various magazines around Spring 1999. The game was considered long-lost until its eventual leak on September 9th, 2020, among the GB lotcheck ROMs in
platinum.7z along with Lunar Chase. It was developed by Jupiter Corporation, who previously co-developed Mario Picross. The same company would go on to make an otherwise unrelated 3DS game of the same name in 2015.