00:00
9
4
6
5
4
2
3
7
6
1
3
2
4
5
5
7
6
3
2
1
5
3
7
8
7
2025-10-23(Advanced) Puzzles
Decode challenging placements
Understand overall structure to solve difficult squares.
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.