00:00
6
7
4
3
9
1
8
2
6
2
4
8
7
8
6
9
2
9
4
8
2
6
3
5
3
8
2
6
9
7
2
2024-07-13(Intermediate) Puzzles
Challenge moderately difficult puzzles
Decide where to place numbers by viewing the board as a whole.
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.