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7
2
3
5
7
8
1
9
4
8
6
1
8
5
9
5
4
8
4
7
1
2
1
9
2
3
5
4
6
3
4
2025-07-14(Intermediate) Puzzles
Consider multiple candidates while solving
Use notes to manage complex candidates.
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.