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6
4
3
8
9
5
6
8
2
4
1
7
2
5
1
9
9
6
3
8
7
7
1
2
2025-07-04(Advanced) Puzzles
Test strategic thinking skills
Consider order and possibilities while solving.
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.