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9
4
7
1
2
7
8
9
9
2
8
1
6
7
8
1
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2
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8
9
5
4
7
5
9
6
2
6
9
5
2024-04-23(Intermediate) Puzzles
Moderately challenging puzzles
Start with slightly harder squares to grasp the flow.
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.