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Fillomino (Hex) (896)
Instruction:
Divide the grid along the dotted lines into regions (called polyominoes) so that no two polyominoes with the same area share an edge. Inside some cells are numbers; each number must equal the area of the polyomino it belongs to. A polyomino may contain zero, one, or more of the given numbers. (It is possible to have a "hidden" polyomino: a polyomino without any of the given numbers. "Hidden" polyominoes may have an area, including a value not present in the starting grid, such as 6 in a puzzle with only clues numbered 1-5.)