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4
1
4
8
1
2
3
9
8
6
8
4
1
3
5
9
3
9
6
8
2
9
5
1
1
7
3
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5
6
6
2025-03-23(Intermediate) Puzzles
Consider number order and candidates
Understand remaining numbers in rows and columns logically.
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.