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5
8
4
8
5
1
7
9
6
9
4
4
2
6
3
8
5
1
4
1
4
6
9
7
4
2
8
3
8
5
6
2025-10-28(Intermediate) Puzzles
Challenge that requires careful thought
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.