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7
1
1
6
3
1
4
2
8
2
3
7
5
9
3
6
1
6
2
9
3
5
5
7
8
2025-04-26(Advanced) Puzzles
Challenging and thoughtful puzzles
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.