00:00
4
7
8
6
7
2
4
3
9
8
5
1
4
1
8
5
6
7
2
8
5
9
2
3
6
7
9
1
2
3
8
2025-05-31(Intermediate) Puzzles
Moderately challenging puzzles
Correct mistakes immediately if found.
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.