Rob Cutler has produced a fine set of puzzles here. This is one of those puzzles that could never be presented for a solver to use pencil/paper.
The object: point all the arrows into the grid so that each numbered square is the target of that many arrows.
Rob has produced some other interesting puzzle apps. We'll report on those at a later date.
Actually, this puzzle type frequently appears in pencil-and-paper competitions.
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