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5
1
6
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3
2
8
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9
1
8
5
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9
2
7
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1
6
1
6
9
2025-02-24(Advanced) Puzzles
Focused puzzles for careful solving
Maximize logic and proceed carefully.
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.