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6
9
2
8
1
1
5
9
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7
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5
2
6
3
2
1
5
8
1
8
7
2025-04-04(Advanced) Puzzles
Complex puzzles to challenge your mind
Apply strategy and logic to advance.
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.