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4
5
8
4
2
1
5
8
3
1
5
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1
8
7
3
5
6
1
9
5
1
9
7
4
3
4
8
3
2
8
2024-01-07(Intermediate) Puzzles
Puzzles requiring strategic thinking
Correct mistakes immediately if found.
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.