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Windows Windows (336)
Instruction:
Shade exactly two cells in each of the thickly outlined 2x2 regions, i.e. the Windows. Shaded cells must form a single connected area. All white cells must be connected horizontally or vertically through other white cells to an edge of the grid. No 2x2 area can contain all shaded cells or all white cells. Also, there are dotted areas, i.e. the other windows. Two such dotted areas forming the same shape without rotation/reflection form a ‘pair’. For cells in the same position in a pair, exactly one of the cells must be shaded and the other must be left white.