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3
9
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2
7
6
3
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1
8
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8
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5
7
4
1
9
2024-07-15(Advanced) Puzzles
Decode challenging placements
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.