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7
9
4
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8
6
3
1
4
1
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9
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8
1
9
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9
7
3
8
1
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6
6
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9
4
2024-09-21(Intermediate) Puzzles
Apply logic to solve effectively
Compare candidates and fill definite numbers first.
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.