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How to play
- Usual sudoku rules: 1 to 9 once in every row, column and 3×3 box.
- Plus: each of the two long diagonals holds 1 to 9 once.
- The diagonals are shaded on the grid; the centre cell is on both.
- Fewer starting digits than plain sudoku, because the diagonals do extra work.
- Every puzzle has exactly one solution.
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