2
3
6
7
6
9
3
8
9
6
1
5
3
9
9
7
5
7
6
3
4
5
2
8
1
7
5
9
2
7
9
4
2

This Sudoku Puzzle has 31 steps and it is solved using Naked Single, Full House, Hidden Single, Naked Pair, undefined, Locked Candidates Type 2 (Claiming), Uniqueness Test 1, Give Up techniques.

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

Solution Steps:

  1. Row 3 / Column 9 → 4 (Naked Single)
  2. Row 5 / Column 9 → 1 (Naked Single)
  3. Row 9 / Column 8 → 8 (Naked Single)
  4. Row 2 / Column 9 → 7 (Naked Single)
  5. Row 9 / Column 9 → 3 (Full House)
  6. Row 3 / Column 2 → 9 (Naked Single)
  7. Row 5 / Column 8 → 2 (Naked Single)
  8. Row 7 / Column 8 → 5 (Naked Single)
  9. Row 6 / Column 8 → 9 (Full House)
  10. Row 4 / Column 7 → 8 (Full House)
  11. Row 8 / Column 7 → 6 (Naked Single)
  12. Row 9 / Column 7 → 1 (Full House)
  13. Row 6 / Column 3 → 2 (Hidden Single)
  14. Row 1 / Column 5 → 7 (Hidden Single)
  15. Row 2 / Column 3 → 8 (Hidden Single)
  16. Row 6 / Column 2 → 7 (Hidden Single)
  17. Row 8 / Column 1 → 9 (Hidden Single)
  18. Row 8 / Column 6 → 7 (Hidden Single)
  19. Row 4 / Column 4 → 2 (Hidden Single)
  20. Row 1 / Column 7 → 2 (Hidden Single)
  21. Row 3 / Column 7 → 5 (Full House)
  22. Row 3 / Column 5 → 2 (Hidden Single)
  23. Row 1 / Column 3 → 5 (Hidden Single)
  24. Row 5 / Column 2 → 6 (Hidden Single)
  25. Row 7 / Column 1 → 3 (Hidden Single)
  26. Naked Pair: 1,4 in r24c6 => r67c6<>1, r7c6<>4
  27. XY-Wing: 4/6/8 in r59c5,r7c6 => r6c6,r7c5<>8
  28. Locked Candidates Type 2 (Claiming): 8 in c5 => r6c4<>8
  29. Uniqueness Test 1: 4/6 in r7c35,r9c35 => r7c5<>4, r7c5<>6
  30. Row 7 / Column 5 → 1 (Naked Single)
  31. Give Up: Don't know how to proceed!
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