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8
1
5
7
1
5
8
4
3
6
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8
8
7
5
2
8
9
3
1
1
4
5
9
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7
2
5
6
2025-05-17(Intermediate) Puzzles
Puzzles requiring strategic thinking
Read number patterns to identify efficient steps.
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.