Rules: Shade some cells and draw a single closed loop through all remaining white cells, the loop's path moving horizontally or vertically through cell centers. Clue cells may not be shaded. The loop may not intersect itself, or go through a cell more than once. Shaded cells cannot share an edge with each other. Some cells contain a number and arrow, or a question mark, and may not be part of the loop. Numbered arrows in such cells indicate
the total number of shaded cells in the direction of the arrow.
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