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3
9
5
2
9
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8
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7
4
3
2
5
1
8
9
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7
9
1
5
2025-06-16(Advanced) Puzzles
Use full logic for complex solving
Complex patterns can be solved step by step using logic.
Tips for Solving Sudoku
- Start with squares with fewer numbers: Begin with rows, columns, or blocks that already have more numbers filled; fewer candidates make it easier to solve.
- Pencil marks (notes): For beginners, write possible numbers in small font in empty squares for reference.
- Review: If stuck, check for duplicate numbers or rule violations.
- Basic rule: Do not repeat the same number in the same row, column, or 3x3 block.