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9
1
5
5
4
7
6
8
4
7
2
1
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8
7
6
2
1
9
3
3
5
7
8
4
6
3
9
9
8
5
2025-01-21(Intermediate) Puzzles
Standard difficulty puzzles
Organize multiple candidates to avoid mistakes.
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.