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

This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, undefined, Skyscraper, Naked Pair, Full House techniques.

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

Solution Steps:

  1. Row 6 / Column 4 → 1 (Naked Single)
  2. Row 3 / Column 4 → 6 (Hidden Single)
  3. Row 8 / Column 3 → 3 (Hidden Single)
  4. Row 9 / Column 9 → 3 (Hidden Single)
  5. Row 7 / Column 5 → 4 (Hidden Single)
  6. Row 6 / Column 3 → 9 (Hidden Single)
  7. Row 2 / Column 4 → 4 (Hidden Single)
  8. Row 6 / Column 6 → 3 (Hidden Single)
  9. Row 5 / Column 1 → 3 (Hidden Single)
  10. Row 3 / Column 1 → 4 (Hidden Single)
  11. Row 1 / Column 8 → 4 (Hidden Single)
  12. Row 8 / Column 4 → 9 (Hidden Single)
  13. Row 2 / Column 5 → 3 (Hidden Single)
  14. Row 1 / Column 1 → 9 (Hidden Single)
  15. Row 2 / Column 6 → 9 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 2 in b8 => r5c5<>2
  17. Locked Candidates Type 2 (Claiming): 7 in c4 => r4c6,r5c5<>7
  18. Naked Triple: 1,7,8 in r3c235 => r3c79<>7, r3c7<>8
  19. X-Wing: 8 r26 c28 => r345c2,r45c8<>8
  20. Skyscraper: 8 in r4c6,r5c7 (connected by r1c67) => r5c5<>8
  21. Row 5 / Column 5 → 5 (Naked Single)
  22. Row 4 / Column 6 → 8 (Naked Single)
  23. Row 7 / Column 1 → 8 (Hidden Single)
  24. Locked Candidates Type 2 (Claiming): 5 in r7 => r8c8,r9c7<>5
  25. Locked Candidates Type 2 (Claiming): 5 in c8 => r4c9<>5
  26. X-Wing: 2 r17 c39 => r2c9,r59c3<>2
  27. Row 2 / Column 9 → 7 (Naked Single)
  28. Naked Pair: 6,7 in r9c37 => r9c56<>7
  29. Locked Candidates Type 1 (Pointing): 7 in b8 => r8c28<>7
  30. Row 3 / Column 2 → 7 (Hidden Single)
  31. Locked Candidates Type 1 (Pointing): 1 in b1 => r5c3<>1
  32. Locked Candidates Type 1 (Pointing): 7 in b9 => r5c7<>7
  33. 2-String Kite: 6 in r5c3,r8c8 (connected by r8c2,r9c3) => r5c8<>6
  34. Row 5 / Column 8 → 7 (Naked Single)
  35. Row 5 / Column 4 → 2 (Naked Single)
  36. Row 4 / Column 4 → 7 (Full House)
  37. W-Wing: 8/6 in r1c7,r5c3 connected by 6 in r9c37 => r1c3,r5c7<>8
  38. Row 5 / Column 3 → 8 (Hidden Single)
  39. Row 3 / Column 3 → 1 (Naked Single)
  40. Row 6 / Column 2 → 5 (Naked Single)
  41. Row 6 / Column 8 → 8 (Full House)
  42. Row 1 / Column 3 → 2 (Naked Single)
  43. Row 2 / Column 2 → 8 (Full House)
  44. Row 2 / Column 8 → 2 (Full House)
  45. Row 3 / Column 5 → 8 (Naked Single)
  46. Row 4 / Column 1 → 2 (Naked Single)
  47. Row 9 / Column 1 → 5 (Full House)
  48. Row 1 / Column 9 → 6 (Naked Single)
  49. Row 7 / Column 3 → 7 (Naked Single)
  50. Row 9 / Column 3 → 6 (Full House)
  51. Row 8 / Column 2 → 2 (Full House)
  52. Row 8 / Column 8 → 6 (Naked Single)
  53. Row 4 / Column 8 → 5 (Full House)
  54. Row 9 / Column 6 → 1 (Naked Single)
  55. Row 1 / Column 7 → 8 (Naked Single)
  56. Row 4 / Column 9 → 1 (Naked Single)
  57. Row 4 / Column 2 → 6 (Full House)
  58. Row 5 / Column 2 → 1 (Full House)
  59. Row 7 / Column 7 → 5 (Naked Single)
  60. Row 7 / Column 9 → 2 (Full House)
  61. Row 9 / Column 7 → 7 (Full House)
  62. Row 9 / Column 5 → 2 (Full House)
  63. Row 8 / Column 5 → 7 (Naked Single)
  64. Row 1 / Column 5 → 1 (Full House)
  65. Row 1 / Column 6 → 7 (Full House)
  66. Row 8 / Column 6 → 5 (Full House)
  67. Row 5 / Column 9 → 9 (Naked Single)
  68. Row 3 / Column 9 → 5 (Full House)
  69. Row 3 / Column 7 → 9 (Full House)
  70. Row 5 / Column 7 → 6 (Full House)
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