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6
8
7
4
2
4
6
1
9
3
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8
7
2
6
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9
7
5
8
2
9
1
6
3
2025-04-19(Intermediate) Puzzles
Organize candidates while solving
Compare candidates and fill 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.