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9
1
7
8
6
2
7
9
1
8
1
7
6
2
8
3
7
9
4
9
1
5
8
9
3
6
6
4
8
1
7
2024-02-07(Intermediate) Puzzles
Puzzles requiring strategic thinking
Analyze row and column patterns for optimal 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.