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4
5
7
1
3
4
3
5
2
8
7
3
4
5
7
2
7
8
2
4
9
1
5
3
6
9
7
3
5
8
6
2025-01-30(Intermediate) Puzzles
Puzzles suitable for logical challenges
Confirm each number gradually to understand the structure.
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.