Yajisan-Kazusan (from Japanese, literally "arrow - number") is a logic puzzle published by Nikoli. The aim is to blacken some cells according to the following rules: - Black cells must not be orthogonally connected. - A cell with a number may be blacken. - All the white cells must form an orthogonally continuous area. - A cell containing a number and an arrow represents how many black cells are in the row or column pointed at by the arrow...
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