00:00
5
9
2
8
8
3
6
2
7
2
4
8
9
6
7
1
6
4
2
7
4
1
8
7
4
8
5
1
4
8
3
2025-03-25(Intermediate) Puzzles
Challenge that requires careful thought
Advance gradually toward completion.
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.