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

This Sudoku Puzzle has 60 steps and it is solved using Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Skyscraper, Hidden Single, Full House techniques.

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

Solution Steps:

  1. Locked Triple: 1,3,6 in r456c3 => r37c3,r46c2,r5c1<>1, r3c3,r5c1<>3, r46c2<>6
  2. Row 5 / Column 1 → 8 (Naked Single)
  3. Row 5 / Column 7 → 6 (Naked Single)
  4. Locked Candidates Type 1 (Pointing): 2 in b4 => r23c2<>2
  5. Locked Candidates Type 1 (Pointing): 5 in b4 => r8c2<>5
  6. Locked Candidates Type 1 (Pointing): 2 in b6 => r7c7<>2
  7. Naked Pair: 1,3 in r5c39 => r5c4<>1, r5c46<>3
  8. X-Wing: 7 c37 r37 => r3c2568,r7c2458<>7
  9. Skyscraper: 7 in r8c5,r9c8 (connected by r2c58) => r9c46<>7
  10. Row 9 / Column 8 → 7 (Hidden Single)
  11. Row 3 / Column 7 → 7 (Hidden Single)
  12. Row 3 / Column 3 → 4 (Naked Single)
  13. Row 7 / Column 3 → 7 (Naked Single)
  14. Row 7 / Column 8 → 9 (Hidden Single)
  15. Row 7 / Column 2 → 1 (Naked Single)
  16. Row 3 / Column 2 → 8 (Naked Single)
  17. Row 8 / Column 1 → 5 (Naked Single)
  18. Row 8 / Column 2 → 9 (Naked Single)
  19. Row 9 / Column 1 → 4 (Full House)
  20. Row 8 / Column 9 → 8 (Naked Single)
  21. Row 7 / Column 7 → 4 (Naked Single)
  22. Row 8 / Column 6 → 7 (Naked Single)
  23. Row 8 / Column 5 → 1 (Full House)
  24. Row 4 / Column 7 → 2 (Naked Single)
  25. Row 6 / Column 7 → 8 (Full House)
  26. Row 7 / Column 9 → 2 (Naked Single)
  27. Row 9 / Column 9 → 5 (Full House)
  28. Row 5 / Column 6 → 9 (Naked Single)
  29. Row 4 / Column 2 → 5 (Naked Single)
  30. Row 7 / Column 4 → 3 (Naked Single)
  31. Row 7 / Column 5 → 8 (Full House)
  32. Row 5 / Column 4 → 7 (Naked Single)
  33. Row 9 / Column 6 → 2 (Naked Single)
  34. Row 9 / Column 4 → 9 (Full House)
  35. Row 4 / Column 5 → 3 (Naked Single)
  36. Row 6 / Column 2 → 2 (Naked Single)
  37. Row 1 / Column 4 → 6 (Naked Single)
  38. Row 3 / Column 6 → 3 (Naked Single)
  39. Row 2 / Column 5 → 7 (Naked Single)
  40. Row 3 / Column 5 → 9 (Naked Single)
  41. Row 6 / Column 5 → 5 (Full House)
  42. Row 4 / Column 6 → 6 (Naked Single)
  43. Row 6 / Column 4 → 1 (Full House)
  44. Row 2 / Column 4 → 2 (Full House)
  45. Row 1 / Column 6 → 8 (Full House)
  46. Row 1 / Column 2 → 7 (Naked Single)
  47. Row 2 / Column 2 → 6 (Full House)
  48. Row 3 / Column 8 → 1 (Naked Single)
  49. Row 3 / Column 1 → 2 (Full House)
  50. Row 4 / Column 3 → 1 (Naked Single)
  51. Row 4 / Column 8 → 4 (Full House)
  52. Row 6 / Column 8 → 3 (Naked Single)
  53. Row 2 / Column 8 → 8 (Full House)
  54. Row 5 / Column 9 → 1 (Full House)
  55. Row 5 / Column 3 → 3 (Full House)
  56. Row 6 / Column 3 → 6 (Full House)
  57. Row 2 / Column 1 → 3 (Naked Single)
  58. Row 1 / Column 1 → 1 (Full House)
  59. Row 1 / Column 9 → 3 (Full House)
  60. Row 2 / Column 9 → 4 (Full House)
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