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

This Sudoku Puzzle has 77 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, Locked Candidates Type 2 (Claiming), Turbot Fish, undefined, Continuous Nice Loop, Naked Pair, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 3 → 5 (Hidden Single)
  2. Row 1 / Column 6 → 5 (Hidden Single)
  3. Row 6 / Column 4 → 5 (Hidden Single)
  4. Row 8 / Column 1 → 1 (Hidden Single)
  5. Row 9 / Column 2 → 5 (Hidden Single)
  6. Row 7 / Column 7 → 5 (Hidden Single)
  7. Row 5 / Column 8 → 5 (Hidden Single)
  8. Row 8 / Column 2 → 7 (Hidden Single)
  9. Row 8 / Column 7 → 3 (Naked Single)
  10. Locked Candidates Type 1 (Pointing): 1 in b6 => r13c9<>1
  11. Locked Candidates Type 1 (Pointing): 9 in b7 => r7c45<>9
  12. Locked Candidates Type 1 (Pointing): 2 in b8 => r456c5<>2
  13. Naked Triple: 4,6,9 in r78c4,r8c6 => r79c5,r9c4<>4, r9c4<>6
  14. Row 9 / Column 4 → 3 (Naked Single)
  15. Locked Candidates Type 1 (Pointing): 4 in b8 => r2c4<>4
  16. Hidden Pair: 1,3 in r12c3 => r12c3<>4, r12c3<>9, r2c3<>2
  17. Naked Triple: 1,3,9 in r2c346 => r2c27<>9, r2c7<>1, r2c8<>3
  18. Locked Candidates Type 2 (Claiming): 9 in r2 => r13c5<>9
  19. Locked Candidates Type 2 (Claiming): 9 in c5 => r4c46,r6c6<>9
  20. Row 6 / Column 6 → 2 (Naked Single)
  21. Turbot Fish: 2 r2c2 =2= r4c2 -2- r4c8 =2= r5c7 => r2c7<>2
  22. Row 2 / Column 7 → 8 (Naked Single)
  23. Row 9 / Column 7 → 7 (Naked Single)
  24. Row 9 / Column 5 → 2 (Naked Single)
  25. Row 7 / Column 5 → 7 (Naked Single)
  26. Row 9 / Column 9 → 8 (Hidden Single)
  27. Locked Candidates Type 2 (Claiming): 4 in r9 => r7c13<>4
  28. Locked Candidates Type 2 (Claiming): 6 in r9 => r7c13<>6
  29. Hidden Pair: 6,7 in r1c89 => r1c89<>3, r1c89<>4, r1c9<>9
  30. Locked Candidates Type 1 (Pointing): 3 in b3 => r3c5<>3
  31. X-Wing: 2 r24 c28 => r3c8<>2
  32. W-Wing: 9/2 in r5c7,r7c1 connected by 2 in r3c17 => r5c1<>9
  33. Continuous Nice Loop: 1/4/9 7= r6c9 =1= r6c5 -1- r3c5 -4- r3c9 =4= r7c9 =6= r1c9 =7= r6c9 =1 => r14c5<>1, r3c18<>4, r6c9<>9
  34. Row 3 / Column 8 → 3 (Naked Single)
  35. Naked Pair: 2,9 in r37c1 => r1c1<>9, r5c1<>2
  36. W-Wing: 2/9 in r3c1,r5c7 connected by 9 in r1c27 => r3c7<>2
  37. Row 3 / Column 1 → 2 (Hidden Single)
  38. Row 2 / Column 2 → 4 (Naked Single)
  39. Row 7 / Column 1 → 9 (Naked Single)
  40. Row 1 / Column 1 → 8 (Naked Single)
  41. Row 2 / Column 8 → 2 (Naked Single)
  42. Row 7 / Column 3 → 2 (Naked Single)
  43. Row 1 / Column 2 → 9 (Naked Single)
  44. Row 5 / Column 1 → 6 (Naked Single)
  45. Row 9 / Column 1 → 4 (Full House)
  46. Row 9 / Column 3 → 6 (Full House)
  47. Row 4 / Column 8 → 8 (Naked Single)
  48. Row 1 / Column 7 → 1 (Naked Single)
  49. Row 6 / Column 2 → 8 (Naked Single)
  50. Row 4 / Column 2 → 2 (Full House)
  51. Row 5 / Column 3 → 9 (Naked Single)
  52. Row 6 / Column 3 → 4 (Full House)
  53. Row 6 / Column 8 → 7 (Naked Single)
  54. Row 1 / Column 3 → 3 (Naked Single)
  55. Row 2 / Column 3 → 1 (Full House)
  56. Row 3 / Column 7 → 9 (Naked Single)
  57. Row 5 / Column 7 → 2 (Full House)
  58. Row 5 / Column 9 → 3 (Naked Single)
  59. Row 5 / Column 5 → 8 (Full House)
  60. Row 1 / Column 8 → 6 (Naked Single)
  61. Row 8 / Column 8 → 4 (Full House)
  62. Row 7 / Column 9 → 6 (Full House)
  63. Row 7 / Column 4 → 4 (Full House)
  64. Row 6 / Column 9 → 1 (Naked Single)
  65. Row 4 / Column 9 → 9 (Full House)
  66. Row 6 / Column 5 → 9 (Full House)
  67. Row 1 / Column 5 → 4 (Naked Single)
  68. Row 1 / Column 9 → 7 (Full House)
  69. Row 3 / Column 9 → 4 (Full House)
  70. Row 3 / Column 5 → 1 (Full House)
  71. Row 4 / Column 5 → 3 (Full House)
  72. Row 2 / Column 4 → 9 (Naked Single)
  73. Row 2 / Column 6 → 3 (Full House)
  74. Row 4 / Column 6 → 6 (Naked Single)
  75. Row 4 / Column 4 → 1 (Full House)
  76. Row 8 / Column 4 → 6 (Full House)
  77. Row 8 / Column 6 → 9 (Full House)
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