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9
2
7
9
4
1
5
4
2
8
3
5
7
9
2
1
6
7
2
7
9
3
1
5
5
1
2025-11-20(Advanced) Puzzles
Test reasoning and deduction skills
Evaluate multiple candidates simultaneously.
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.