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How to play
- Columns are numbered 1 to n across the top, rows 1 to n down the side.
- A filled square counts its column number toward its row total, and its row number toward its column total.
- The totals beside each row and under each column must match exactly.
- Tap a square once to fill it, twice for a cross, three times to clear.
- Every puzzle has exactly one answer; a hint fixes a mistake or fills a correct square.
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