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4
5
3
7
6
3
1
4
8
6
2
5
9
1
5
7
2
9
4
7
3
5
2
9
2025-09-08(Advanced) Puzzles
Test reasoning and strategy skills
Compare candidate possibilities to advance optimally.
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.