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7
3
1
2
8
1
6
5
6
8
7
1
3
5
9
9
3
1
7
6
2
8
4
3
9
1
4
5
6
5
9
2024-01-05(Intermediate) Puzzles
Develop reasoning skills with puzzles
Organize candidates and solve step by step.
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.