00:00
4
2
5
8
9
9
7
3
6
4
1
3
4
9
7
4
9
7
1
6
4
5
1
7
2
6
9
5
3
2
9
2025-06-09(Intermediate) Puzzles
Strategically plan number placement
Compare multiple candidates and place definite numbers first.
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.