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7
4
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1
6
8
3
1
5
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6
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9
8
8
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7
9
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7
8
4
3
2025-11-09(Advanced) Puzzles
Test reasoning and strategy skills
Organize complex candidates and consider the whole board.
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.