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3
8
1
5
4
1
9
7
6
7
4
5
3
5
9
7
1
1
6
8
4
9
1
7
9
2
6
8
2
6
5
2024-04-05(Intermediate) Puzzles
Consider multiple candidates while solving
Confirm each number gradually to understand the structure.
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.