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5
4
9
7
4
9
7
3
1
5
8
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9
4
1
5
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9
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4
9
9
3
6
4
1
9
1
7
8
2024-02-19(Intermediate) Puzzles
Judge placement strategically
Compare rows, columns, and blocks to logically narrow choices.
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.