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6
2
1
9
7
5
6
7
4
5
6
1
4
9
7
5
1
6
4
1
8
6
1
9
3
8
2
6
2
9
7
Random Puzzle(Intermediate)
Puzzles to challenge logical thinking
For squares with multiple candidates, consider order and priority.
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.