1
3
8
2
4
7
2
8
4
3
7
2
3
4
5
1
1
6
4
5
2
2
5
1
3

This Sudoku Puzzle has 20 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Give Up techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 6 / Column 5 → 9 (Naked Single)
  2. Row 1 / Column 7 → 9 (Naked Single)
  3. Row 6 / Column 4 → 8 (Naked Single)
  4. Row 3 / Column 7 → 3 (Naked Single)
  5. Row 4 / Column 7 → 8 (Naked Single)
  6. Row 6 / Column 1 → 5 (Naked Single)
  7. Row 6 / Column 2 → 2 (Naked Single)
  8. Row 6 / Column 8 → 3 (Full House)
  9. Row 9 / Column 7 → 4 (Naked Single)
  10. Row 8 / Column 7 → 2 (Full House)
  11. Row 1 / Column 2 → 7 (Hidden Single)
  12. Row 4 / Column 3 → 1 (Hidden Single)
  13. Row 5 / Column 9 → 2 (Hidden Single)
  14. Row 9 / Column 2 → 1 (Hidden Single)
  15. Row 4 / Column 8 → 5 (Hidden Single)
  16. Row 3 / Column 3 → 2 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 6 in b3 => r78c9<>6
  18. Locked Candidates Type 1 (Pointing): 6 in b5 => r23789c6<>6
  19. Locked Candidates Type 1 (Pointing): 7 in b5 => r3789c6<>7
  20. Give Up: Don't know how to proceed!
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