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How to play
- 1 to 9 once in every row and column, as usual.
- The 3×3 boxes are replaced by nine irregular regions, marked by thick lines; each holds 1 to 9 once.
- Regions are different in every puzzle, so look at the shapes before you start.
- Where a region sticks out into a row, it forces digits in a way boxes never can.
- Every puzzle has exactly one solution.
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