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6
5
3
7
4
8
2
5
3
7
4
1
8
2
8
5
7
4
7
6
5
1
7
3
4
4
3
9
1
2
5
2025-09-02(Intermediate) Puzzles
Combine logic to solve efficiently
Proper organization makes complex squares easier.
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.