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Rules -- Prev-Arrow-Cation

Prev-Arrow-Cation was invented by the Japanese puzzle company Nikoli (under the name Yajisan-Kazusan).

1. Determine whether each cell is white or black according to the following rules.
2. A white cell containing a number and an arrow represents how many black cells are in the row or column pointed at by the arrow.
3. A cell containing a number and an arrow may be shaded in; if so, the clue in it becomes meaningless, and may or may not be true.
4. No two black cells may share an edge. All of the white cells must be connected to each other through their edges.

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