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8
4
1
9
2
5
8
7
4
4
6
9
3
7
3
6
5
1
3
9
5
1
3
1
8
2
5
6
9
1
3
2025-07-22(Intermediate) Puzzles
Enjoy using your brain to solve puzzles
Review candidates if stuck and reorganize.
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.