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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, undefined, Full House, Locked Pair, Skyscraper techniques.

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

Solution Steps:

  1. Row 4 / Column 8 → 2 (Hidden Single)
  2. Row 6 / Column 3 → 2 (Hidden Single)
  3. Row 7 / Column 3 → 8 (Naked Single)
  4. Row 9 / Column 3 → 4 (Naked Single)
  5. Row 2 / Column 1 → 5 (Hidden Single)
  6. Row 9 / Column 9 → 5 (Hidden Single)
  7. Row 5 / Column 3 → 5 (Hidden Single)
  8. Row 9 / Column 6 → 8 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 3 in b4 => r3c2<>3
  10. Locked Candidates Type 1 (Pointing): 1 in b5 => r6c79<>1
  11. Locked Candidates Type 1 (Pointing): 9 in b6 => r6c456<>9
  12. Naked Triple: 2,6,9 in r2c469 => r2c28<>6, r2c8<>9
  13. Hidden Pair: 1,5 in r68c6 => r6c6<>3, r68c6<>6, r8c6<>2
  14. 2-String Kite: 8 in r1c7,r6c2 (connected by r1c1,r2c2) => r6c7<>8
  15. X-Wing: 8 r26 c28 => r5c8<>8
  16. W-Wing: 6/4 in r3c2,r8c8 connected by 4 in r2c28 => r8c2<>6
  17. Row 8 / Column 2 → 7 (Naked Single)
  18. Row 4 / Column 2 → 3 (Naked Single)
  19. Row 4 / Column 6 → 9 (Naked Single)
  20. Row 4 / Column 4 → 7 (Full House)
  21. Row 6 / Column 2 → 8 (Naked Single)
  22. Row 5 / Column 1 → 7 (Full House)
  23. Row 2 / Column 2 → 4 (Naked Single)
  24. Row 3 / Column 2 → 6 (Full House)
  25. Row 2 / Column 8 → 8 (Naked Single)
  26. Row 3 / Column 1 → 9 (Naked Single)
  27. Row 1 / Column 1 → 8 (Naked Single)
  28. Row 5 / Column 7 → 8 (Hidden Single)
  29. Row 8 / Column 8 → 4 (Hidden Single)
  30. Row 5 / Column 9 → 1 (Hidden Single)
  31. Row 3 / Column 9 → 2 (Naked Single)
  32. Row 2 / Column 6 → 2 (Hidden Single)
  33. Locked Pair: 6,9 in r12c9 => r1c7,r67c9<>6, r1c7,r67c9<>9
  34. Skyscraper: 3 in r7c9,r9c4 (connected by r6c49) => r7c56,r9c8<>3
  35. Row 7 / Column 6 → 6 (Naked Single)
  36. Row 1 / Column 6 → 3 (Naked Single)
  37. Row 7 / Column 1 → 2 (Naked Single)
  38. Row 9 / Column 1 → 6 (Full House)
  39. Row 8 / Column 4 → 1 (Naked Single)
  40. Row 1 / Column 3 → 1 (Naked Single)
  41. Row 3 / Column 3 → 3 (Full House)
  42. Row 3 / Column 5 → 4 (Naked Single)
  43. Row 3 / Column 7 → 1 (Full House)
  44. Row 9 / Column 8 → 9 (Naked Single)
  45. Row 8 / Column 6 → 5 (Naked Single)
  46. Row 6 / Column 6 → 1 (Full House)
  47. Row 1 / Column 7 → 4 (Naked Single)
  48. Row 7 / Column 7 → 7 (Naked Single)
  49. Row 9 / Column 4 → 3 (Naked Single)
  50. Row 8 / Column 5 → 2 (Naked Single)
  51. Row 8 / Column 7 → 6 (Full House)
  52. Row 7 / Column 5 → 9 (Naked Single)
  53. Row 7 / Column 9 → 3 (Full House)
  54. Row 9 / Column 7 → 2 (Full House)
  55. Row 9 / Column 5 → 7 (Full House)
  56. Row 6 / Column 7 → 9 (Full House)
  57. Row 6 / Column 4 → 6 (Naked Single)
  58. Row 2 / Column 4 → 9 (Full House)
  59. Row 1 / Column 5 → 6 (Full House)
  60. Row 2 / Column 9 → 6 (Full House)
  61. Row 1 / Column 9 → 9 (Full House)
  62. Row 6 / Column 9 → 7 (Full House)
  63. Row 5 / Column 5 → 3 (Naked Single)
  64. Row 5 / Column 8 → 6 (Full House)
  65. Row 6 / Column 8 → 3 (Full House)
  66. Row 6 / Column 5 → 5 (Full House)
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