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3
8
9
6
2
7
8
3
9
4
2
7
1
6
4
5
2
7
6
2
8
1
7
9
1
6
2025-10-09(Advanced) Puzzles
Test reasoning and strategy skills
Think strategically to solve puzzles steadily.
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.