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This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, undefined, Naked Single, 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 9 / Column 5 → 2 (Hidden Single)
  2. Row 1 / Column 5 → 4 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 1 in b2 => r5c6<>1
  4. Locked Candidates Type 1 (Pointing): 6 in b2 => r1c123<>6
  5. Locked Candidates Type 1 (Pointing): 6 in b5 => r5c12<>6
  6. Row 9 / Column 2 → 6 (Hidden Single)
  7. Row 8 / Column 9 → 6 (Hidden Single)
  8. Row 9 / Column 1 → 4 (Hidden Single)
  9. Row 5 / Column 2 → 4 (Hidden Single)
  10. Row 6 / Column 9 → 4 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 3 in b8 => r5c4<>3
  12. Locked Candidates Type 2 (Claiming): 5 in r8 => r7c12,r9c3<>5
  13. Row 1 / Column 2 → 5 (Hidden Single)
  14. Row 2 / Column 9 → 5 (Hidden Single)
  15. Naked Triple: 1,2,3 in r56c1,r6c3 => r4c13<>3
  16. Naked Triple: 7,8,9 in r79c6,r8c5 => r79c4<>9, r9c4<>7
  17. Naked Triple: 5,6,9 in r248c3 => r19c3<>9
  18. X-Wing: 2 c37 r16 => r1c189,r6c1<>2
  19. X-Wing: 7 r68 c57 => r129c7,r25c5<>7
  20. Row 2 / Column 1 → 7 (Hidden Single)
  21. Row 2 / Column 3 → 6 (Hidden Single)
  22. Row 4 / Column 3 → 5 (Naked Single)
  23. Row 4 / Column 1 → 6 (Naked Single)
  24. Row 8 / Column 3 → 9 (Naked Single)
  25. Row 8 / Column 1 → 5 (Hidden Single)
  26. Locked Candidates Type 1 (Pointing): 8 in b7 => r7c689<>8
  27. Row 7 / Column 6 → 9 (Naked Single)
  28. X-Wing: 8 r28 c57 => r149c7<>8
  29. Row 4 / Column 9 → 8 (Hidden Single)
  30. X-Wing: 9 r24 c57 => r19c7,r5c5<>9
  31. Row 9 / Column 7 → 1 (Naked Single)
  32. Row 7 / Column 9 → 2 (Naked Single)
  33. Row 9 / Column 3 → 3 (Naked Single)
  34. Row 7 / Column 8 → 5 (Naked Single)
  35. Row 1 / Column 3 → 2 (Naked Single)
  36. Row 6 / Column 3 → 1 (Full House)
  37. Row 7 / Column 2 → 8 (Naked Single)
  38. Row 3 / Column 2 → 3 (Full House)
  39. Row 7 / Column 1 → 1 (Full House)
  40. Row 7 / Column 4 → 3 (Full House)
  41. Row 9 / Column 4 → 5 (Naked Single)
  42. Row 1 / Column 7 → 3 (Naked Single)
  43. Row 6 / Column 1 → 3 (Naked Single)
  44. Row 5 / Column 1 → 2 (Full House)
  45. Row 4 / Column 7 → 9 (Naked Single)
  46. Row 4 / Column 5 → 3 (Full House)
  47. Row 6 / Column 5 → 7 (Naked Single)
  48. Row 6 / Column 7 → 2 (Full House)
  49. Row 2 / Column 7 → 8 (Naked Single)
  50. Row 2 / Column 5 → 9 (Full House)
  51. Row 8 / Column 7 → 7 (Full House)
  52. Row 8 / Column 5 → 8 (Full House)
  53. Row 5 / Column 5 → 1 (Full House)
  54. Row 9 / Column 6 → 7 (Full House)
  55. Row 5 / Column 8 → 7 (Naked Single)
  56. Row 5 / Column 9 → 3 (Full House)
  57. Row 5 / Column 6 → 6 (Naked Single)
  58. Row 5 / Column 4 → 9 (Full House)
  59. Row 3 / Column 4 → 7 (Naked Single)
  60. Row 1 / Column 4 → 6 (Full House)
  61. Row 9 / Column 9 → 9 (Naked Single)
  62. Row 9 / Column 8 → 8 (Full House)
  63. Row 1 / Column 8 → 9 (Naked Single)
  64. Row 3 / Column 8 → 2 (Full House)
  65. Row 3 / Column 9 → 1 (Naked Single)
  66. Row 1 / Column 9 → 7 (Full House)
  67. Row 1 / Column 1 → 8 (Naked Single)
  68. Row 1 / Column 6 → 1 (Full House)
  69. Row 3 / Column 6 → 8 (Full House)
  70. Row 3 / Column 1 → 9 (Full House)
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