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In a grid, some squares are shaded, which they may have a number and arrow. You are to blacken in some squares (no two sharing an edge, though they may share an edge with the given shaded squares) so each arrow points to as many blackened squares as its number. Additionally, draw a loop through all squares not shaded or blackened, connecting squares only orthogonally and without crossing your path.
Also called: arrow ring puzzle
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