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Walls (390)
Instruction:
Draw lines (“walls”) along the edges of cells. There must be an orthogonal path between any two cells that does not go through any walls (that is, the walls must not divide the grid into separate regions). Two cells can “see” each other if they are in the same row or column without any walls between them. Each number indicates the total number of cells that can be seen from the numbered cell, including the cell itself.