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4
7
6
7
9
5
3
5
3
8
6
3
4
5
9
3
8
7
4
3
2
1
5
9
2025-02-17(Advanced) Puzzles
Decode challenging placements
Look at the board to check placements carefully.
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.