00:00
2
6
8
6
4
1
7
4
6
3
1
3
5
6
4
7
4
1
9
4
3
5
2
8
6
5
9
8
3
2
7
2025-01-15(Intermediate) Puzzles
Challenge moderately difficult puzzles
Use notes to manage complex candidates.
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.