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2
9
3
6
3
6
5
1
2
7
6
7
2
9
4
8
6
3
1
2
8
3
9
1
6
2024-02-01(Advanced) Puzzles
Thoughtful puzzles requiring strategy
Understand overall structure to solve difficult squares.
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.