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Stostone (1052)
Instruction:
Shade some cells such that every region has exactly one polyomino (a group of orthogonally connected shaded cells). If two cells that touch along an edge belong to different regions, then at least one of the two cells must be unshaded. The shading must be such that if all the polyominoes move as far downward as they can without intersecting another polyomino, the bottom half of the grid will be shaded and the top half of the grid will be unshaded. If a region contains a number, that number must be the area of the polyomino in that region. (The location of the number within the region has no relevance to the puzzle.)