00:00
2
9
4
1
7
2
7
9
6
8
3
1
7
9
1
8
6
6
9
7
9
4
3
8
7
6
5
2025-05-04(Advanced) Puzzles
Tackle tough puzzles with patience
Apply strategy and logic to advance.
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.