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6
8
3
1
2
5
9
1
9
5
4
3
2
1
7
6
9
3
3
7
1
4
6
2024-10-29(Advanced) Puzzles
Test strategic thinking skills
Compare candidates and proceed in the most efficient order.
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.