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4
6
8
7
3
2
4
9
1
6
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5
6
9
8
7
2
9
7
3
1
9
2
7
9
3
8
9
3
6
7
2024-02-22(Intermediate) Puzzles
Combine logic to solve efficiently
Read number patterns to identify efficient steps.
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.