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9
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9

This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Single, Skyscraper, Turbot Fish, undefined, Full House, Bivalue Universal Grave + 1 techniques.

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

Solution Steps:

  1. Row 1 / Column 7 → 3 (Hidden Single)
  2. Row 6 / Column 7 → 7 (Hidden Single)
  3. Row 3 / Column 7 → 9 (Hidden Single)
  4. Row 7 / Column 8 → 1 (Hidden Single)
  5. Row 6 / Column 5 → 1 (Hidden Single)
  6. Row 4 / Column 7 → 1 (Hidden Single)
  7. Row 9 / Column 9 → 9 (Hidden Single)
  8. Row 9 / Column 8 → 7 (Hidden Single)
  9. Row 6 / Column 3 → 3 (Hidden Single)
  10. Row 4 / Column 9 → 6 (Hidden Single)
  11. Row 9 / Column 2 → 3 (Hidden Single)
  12. Locked Candidates Type 1 (Pointing): 4 in b3 => r2c12356<>4
  13. Locked Candidates Type 1 (Pointing): 5 in b9 => r2c7<>5
  14. Locked Candidates Type 1 (Pointing): 6 in b9 => r2c7<>6
  15. Naked Pair: 2,4 in r4c5,r6c4 => r5c456<>2, r5c456<>4
  16. Row 5 / Column 5 → 3 (Naked Single)
  17. Row 8 / Column 6 → 3 (Hidden Single)
  18. Row 8 / Column 1 → 7 (Hidden Single)
  19. Row 7 / Column 6 → 7 (Hidden Single)
  20. Row 2 / Column 2 → 7 (Hidden Single)
  21. Row 8 / Column 7 → 6 (Hidden Single)
  22. Row 9 / Column 1 → 6 (Hidden Single)
  23. Row 7 / Column 4 → 9 (Hidden Single)
  24. Row 5 / Column 4 → 6 (Naked Single)
  25. Row 5 / Column 6 → 9 (Naked Single)
  26. Row 2 / Column 6 → 1 (Hidden Single)
  27. Row 1 / Column 2 → 1 (Hidden Single)
  28. Row 8 / Column 5 → 5 (Hidden Single)
  29. Row 9 / Column 7 → 5 (Hidden Single)
  30. Row 2 / Column 8 → 6 (Hidden Single)
  31. Row 1 / Column 6 → 6 (Hidden Single)
  32. Row 2 / Column 1 → 5 (Hidden Single)
  33. Row 4 / Column 2 → 5 (Hidden Single)
  34. Row 2 / Column 3 → 9 (Hidden Single)
  35. Row 4 / Column 1 → 9 (Hidden Single)
  36. Skyscraper: 8 in r6c1,r8c3 (connected by r68c9) => r7c1<>8
  37. Turbot Fish: 4 r1c3 =4= r4c3 -4- r4c5 =4= r6c4 => r1c4<>4
  38. Locked Candidates Type 1 (Pointing): 4 in b2 => r3c2<>4
  39. W-Wing: 2/4 in r4c3,r7c1 connected by 4 in r1c13 => r6c1,r8c3<>2
  40. Row 8 / Column 3 → 8 (Naked Single)
  41. Row 8 / Column 9 → 2 (Full House)
  42. Row 7 / Column 7 → 8 (Full House)
  43. Row 6 / Column 4 → 2 (Hidden Single)
  44. Row 4 / Column 5 → 4 (Full House)
  45. Row 4 / Column 3 → 2 (Full House)
  46. Row 1 / Column 3 → 4 (Full House)
  47. Skyscraper: 8 in r1c1,r2c9 (connected by r6c19) => r1c8<>8
  48. X-Wing: 8 c28 r35 => r3c4<>8
  49. Bivalue Universal Grave + 1 => r3c8<>5, r3c8<>8
  50. Row 3 / Column 8 → 2 (Naked Single)
  51. Row 1 / Column 8 → 5 (Naked Single)
  52. Row 5 / Column 8 → 8 (Full House)
  53. Row 2 / Column 7 → 4 (Naked Single)
  54. Row 2 / Column 9 → 8 (Full House)
  55. Row 6 / Column 9 → 4 (Full House)
  56. Row 5 / Column 7 → 2 (Full House)
  57. Row 5 / Column 2 → 4 (Full House)
  58. Row 2 / Column 5 → 2 (Full House)
  59. Row 6 / Column 1 → 8 (Full House)
  60. Row 9 / Column 5 → 8 (Full House)
  61. Row 3 / Column 2 → 8 (Naked Single)
  62. Row 7 / Column 2 → 2 (Full House)
  63. Row 1 / Column 1 → 2 (Full House)
  64. Row 1 / Column 4 → 8 (Full House)
  65. Row 7 / Column 1 → 4 (Full House)
  66. Row 3 / Column 6 → 4 (Naked Single)
  67. Row 3 / Column 4 → 5 (Full House)
  68. Row 9 / Column 4 → 4 (Full House)
  69. Row 9 / Column 6 → 2 (Full House)
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