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6
3
5
1
2
1
9
7
8
7
3
5
6
9
1
4
2
6
5
3
1
5
9
2024-02-20(Advanced) Puzzles
High-difficulty fun for practice
Think strategically and solve difficult squares patiently.
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.