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3
4
5
1
2
8
5
1
7
3
8
1
3
2
4
7
1
5
9
3
8
1
5
7
2024-01-20(Advanced) Puzzles
High-difficulty fun for practice
Consider multiple candidates simultaneously to find optimal placement.
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.