00:00
5
6
2
4
9
7
5
6
8
3
1
9
3
4
5
1
1
6
8
4
3
9
5
7
6
3
7
2
2
3
9
2025-10-12(Intermediate) Puzzles
Logic-driven puzzles for step-up solving
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.