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2
5
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5
1
7
1
8
7
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9
2
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9
9
5
3
7
9
2
1
2
2025-05-07(Advanced) Puzzles
Test reasoning and strategy skills
View the whole board to proceed logically.
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.