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A grid has some circles, which may be in the centers of cells, on the grid lines, or on the grid intersections. Divide the grid into regions so that each circle is in a separate region, all regions are rotationally symmetric, and each region has a circle at its center. Sometimes the circles are colored and you shade the regions in the resulting grid based on the circle colors.
Also called: Artist's Block, rotator logic puzzle, Sym-a-Pix, Tentai Show
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