00:00
6
1
3
6
5
2
3
8
4
1
2
3
4
7
5
4
8
6
5
9
1
8
6
2
8
4
1
7
1
4
9
2025-07-20(Intermediate) Puzzles
Challenge moderately difficult puzzles
Organize multiple candidates to avoid mistakes.
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.