00:00
7
1
9
5
2
2
3
7
9
1
4
6
4
1
3
1
8
4
9
4
7
2
3
2
8
1
6
6
3
8
4
2025-07-15(Intermediate) Puzzles
Apply logical thinking for number placement
If stuck, review previous steps to find corrections.
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.