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4
5
9
3
2
1
7
6
5
5
2
9
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1
2
7
5
2
4
9
6
8
3
1
5
8
4
2
9
1
4
2025-07-13(Intermediate) Puzzles
Excellent brain exercise
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.