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4
3
1
7
2
7
5
6
4
3
4
1
7
5
6
6
3
2
8
5
4
2
4
9
1
2
7
5
4
3
9
2024-08-13(Intermediate) Puzzles
Challenge moderately difficult puzzles
Compare multiple candidates and place definite numbers first.
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.