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9
3
7
2
6
5
1
7
8
7
5
8
3
2
1
9
8
4
7
1
1
9
8
2
4
3
6
3
9
6
8
2025-03-09(Intermediate) Puzzles
Logic-driven puzzles for step-up solving
Use notes to reduce hesitation.
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.