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2
5
1
7
9
5
4
7
2
9
1
7
3
2
5
1
4
1
3
7
6
5
7
6
3
4
7
8
3
6
9
2025-07-21(Intermediate) Puzzles
Organize candidates while solving
Understand remaining numbers in rows and columns logically.
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.