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This Sudoku Puzzle has 75 steps and it is solved using Naked Single, Hidden Single, Full House, undefined, Finned Swordfish, Locked Candidates Type 1 (Pointing), Naked Pair, Turbot Fish, Continuous Nice Loop, Skyscraper techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 3 → 9 (Naked Single)
  2. Row 2 / Column 3 → 6 (Naked Single)
  3. Row 4 / Column 3 → 4 (Naked Single)
  4. Row 1 / Column 2 → 5 (Hidden Single)
  5. Row 1 / Column 6 → 4 (Hidden Single)
  6. Row 9 / Column 2 → 4 (Hidden Single)
  7. Row 7 / Column 6 → 3 (Hidden Single)
  8. Row 6 / Column 2 → 6 (Hidden Single)
  9. Row 5 / Column 9 → 4 (Hidden Single)
  10. Row 2 / Column 7 → 4 (Hidden Single)
  11. Row 3 / Column 8 → 3 (Hidden Single)
  12. Row 1 / Column 5 → 3 (Hidden Single)
  13. Row 6 / Column 3 → 2 (Hidden Single)
  14. Row 8 / Column 3 → 3 (Full House)
  15. Row 2 / Column 9 → 2 (Hidden Single)
  16. Row 6 / Column 7 → 3 (Hidden Single)
  17. Row 5 / Column 1 → 3 (Hidden Single)
  18. Row 6 / Column 5 → 5 (Hidden Single)
  19. Row 4 / Column 7 → 5 (Hidden Single)
  20. 2-String Kite: 7 in r3c2,r4c5 (connected by r2c5,r3c4) => r4c2<>7
  21. XYZ-Wing: 1/2/9 in r8c5,r9c67 => r9c4<>9
  22. Finned Swordfish: 7 r135 c248 fr1c9 => r2c8<>7
  23. Locked Candidates Type 1 (Pointing): 7 in b3 => r1c4<>7
  24. Naked Pair: 8,9 in r1c7,r2c8 => r1c89<>8, r1c89<>9
  25. 2-String Kite: 8 in r1c4,r5c8 (connected by r1c7,r2c8) => r5c4<>8
  26. Locked Candidates Type 1 (Pointing): 8 in b5 => r3c6<>8
  27. Row 3 / Column 6 → 2 (Naked Single)
  28. Naked Pair: 1,9 in r8c5,r9c6 => r789c4<>1, r78c4<>9
  29. Turbot Fish: 8 r3c2 =8= r2c1 -8- r2c8 =8= r5c8 => r5c2<>8
  30. XY-Wing: 5/9/2 in r7c48,r9c7 => r9c4<>2
  31. Row 9 / Column 7 → 2 (Hidden Single)
  32. Continuous Nice Loop: 9 8= r5c6 =1= r9c6 =9= r8c5 -9- r8c7 -8- r1c7 =8= r2c8 -8- r5c8 =8= r5c6 =1 => r5c6,r8c129<>9
  33. Skyscraper: 9 in r1c4,r8c5 (connected by r18c7) => r2c5<>9
  34. Locked Candidates Type 1 (Pointing): 9 in b2 => r5c4<>9
  35. Turbot Fish: 9 r5c8 =9= r5c2 -9- r7c2 =9= r9c1 => r9c8<>9
  36. Naked Pair: 5,6 in r9c48 => r9c1<>5
  37. Row 8 / Column 1 → 5 (Hidden Single)
  38. Skyscraper: 1 in r4c1,r5c6 (connected by r9c16) => r4c5,r5c2<>1
  39. 2-String Kite: 9 in r4c5,r9c1 (connected by r8c5,r9c6) => r4c1<>9
  40. X-Wing: 9 c16 r69 => r6c9<>9
  41. Skyscraper: 9 in r7c9,r8c5 (connected by r4c59) => r8c7<>9
  42. Row 8 / Column 7 → 8 (Naked Single)
  43. Row 1 / Column 7 → 9 (Full House)
  44. Row 1 / Column 4 → 8 (Naked Single)
  45. Row 2 / Column 8 → 8 (Naked Single)
  46. Row 3 / Column 4 → 7 (Naked Single)
  47. Row 3 / Column 2 → 8 (Full House)
  48. Row 2 / Column 1 → 7 (Full House)
  49. Row 2 / Column 5 → 1 (Naked Single)
  50. Row 2 / Column 4 → 9 (Full House)
  51. Row 5 / Column 4 → 1 (Naked Single)
  52. Row 8 / Column 5 → 9 (Naked Single)
  53. Row 4 / Column 5 → 7 (Full House)
  54. Row 5 / Column 6 → 8 (Naked Single)
  55. Row 6 / Column 6 → 9 (Full House)
  56. Row 9 / Column 6 → 1 (Full House)
  57. Row 6 / Column 1 → 8 (Naked Single)
  58. Row 6 / Column 9 → 7 (Full House)
  59. Row 9 / Column 1 → 9 (Naked Single)
  60. Row 4 / Column 1 → 1 (Full House)
  61. Row 1 / Column 9 → 6 (Naked Single)
  62. Row 1 / Column 8 → 7 (Full House)
  63. Row 5 / Column 8 → 9 (Naked Single)
  64. Row 4 / Column 9 → 8 (Full House)
  65. Row 4 / Column 2 → 9 (Full House)
  66. Row 5 / Column 2 → 7 (Full House)
  67. Row 8 / Column 9 → 1 (Naked Single)
  68. Row 7 / Column 9 → 9 (Full House)
  69. Row 7 / Column 8 → 5 (Naked Single)
  70. Row 9 / Column 8 → 6 (Full House)
  71. Row 9 / Column 4 → 5 (Full House)
  72. Row 8 / Column 2 → 2 (Naked Single)
  73. Row 7 / Column 2 → 1 (Full House)
  74. Row 7 / Column 4 → 2 (Full House)
  75. Row 8 / Column 4 → 6 (Full House)
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