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

This Sudoku Puzzle has 72 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Full House, Naked Triple, undefined, Hidden Rectangle, Locked Candidates Type 2 (Claiming), Naked Pair, Uniqueness Test 3 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 3 / Column 1 → 1 (Hidden Single)
  2. Row 7 / Column 6 → 8 (Hidden Single)
  3. Row 2 / Column 8 → 4 (Hidden Single)
  4. Row 7 / Column 2 → 1 (Hidden Single)
  5. Row 2 / Column 4 → 8 (Hidden Single)
  6. Row 1 / Column 2 → 4 (Hidden Single)
  7. Row 3 / Column 5 → 4 (Hidden Single)
  8. Row 9 / Column 6 → 4 (Hidden Single)
  9. Row 5 / Column 4 → 4 (Hidden Single)
  10. Row 7 / Column 9 → 4 (Hidden Single)
  11. Row 3 / Column 3 → 9 (Hidden Single)
  12. Row 2 / Column 2 → 3 (Naked Single)
  13. Row 2 / Column 5 → 9 (Hidden Single)
  14. Row 5 / Column 9 → 1 (Hidden Single)
  15. Row 6 / Column 9 → 8 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 2 in b1 => r1c4679<>2
  17. Row 2 / Column 6 → 2 (Hidden Single)
  18. Row 2 / Column 9 → 5 (Full House)
  19. Row 9 / Column 7 → 5 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 3 in b2 => r1c79<>3
  21. Locked Candidates Type 1 (Pointing): 9 in b6 => r4c2<>9
  22. Naked Triple: 3,6,7 in r79c5,r8c6 => r89c4<>3, r89c4<>7
  23. Locked Candidates Type 1 (Pointing): 7 in b8 => r5c5<>7
  24. W-Wing: 7/6 in r1c7,r4c2 connected by 6 in r14c9 => r4c7<>7
  25. Hidden Rectangle: 1/3 in r1c46,r4c46 => r4c6<>3
  26. Finned X-Wing: 6 r68 c26 fr6c1 => r4c2<>6
  27. Row 4 / Column 2 → 7 (Naked Single)
  28. Row 6 / Column 4 → 7 (Hidden Single)
  29. Locked Candidates Type 2 (Claiming): 7 in r8 => r7c7,r9c9<>7
  30. XY-Wing: 1/6/3 in r4c46,r8c6 => r6c6<>3
  31. XY-Wing: 5/6/3 in r6c68,r8c6 => r8c8<>3
  32. Locked Candidates Type 2 (Claiming): 3 in c8 => r4c79,r5c7<>3
  33. Naked Pair: 6,7 in r15c7 => r4c7<>6
  34. Uniqueness Test 3: 1/3 in r1c46,r4c46 => r8c6<>6
  35. Row 8 / Column 6 → 3 (Naked Single)
  36. Row 7 / Column 5 → 7 (Naked Single)
  37. Row 9 / Column 5 → 6 (Naked Single)
  38. Row 8 / Column 2 → 6 (Hidden Single)
  39. Row 6 / Column 2 → 9 (Full House)
  40. Row 9 / Column 3 → 7 (Hidden Single)
  41. W-Wing: 5/3 in r5c5,r6c8 connected by 3 in r4c48 => r5c8,r6c6<>5
  42. Row 6 / Column 6 → 6 (Naked Single)
  43. Row 4 / Column 6 → 1 (Naked Single)
  44. Row 1 / Column 6 → 5 (Full House)
  45. Row 6 / Column 1 → 3 (Naked Single)
  46. Row 6 / Column 8 → 5 (Full House)
  47. Row 4 / Column 4 → 3 (Naked Single)
  48. Row 5 / Column 5 → 5 (Full House)
  49. Row 1 / Column 5 → 3 (Full House)
  50. Row 1 / Column 4 → 1 (Full House)
  51. Row 5 / Column 3 → 8 (Naked Single)
  52. Row 5 / Column 1 → 6 (Full House)
  53. Row 4 / Column 8 → 2 (Naked Single)
  54. Row 1 / Column 3 → 2 (Naked Single)
  55. Row 1 / Column 1 → 8 (Full House)
  56. Row 7 / Column 3 → 3 (Full House)
  57. Row 5 / Column 7 → 7 (Naked Single)
  58. Row 5 / Column 8 → 3 (Full House)
  59. Row 8 / Column 8 → 7 (Full House)
  60. Row 4 / Column 7 → 9 (Naked Single)
  61. Row 4 / Column 9 → 6 (Full House)
  62. Row 1 / Column 7 → 6 (Naked Single)
  63. Row 1 / Column 9 → 7 (Full House)
  64. Row 7 / Column 7 → 2 (Naked Single)
  65. Row 3 / Column 7 → 3 (Full House)
  66. Row 7 / Column 1 → 9 (Full House)
  67. Row 3 / Column 9 → 2 (Full House)
  68. Row 9 / Column 1 → 2 (Full House)
  69. Row 8 / Column 9 → 9 (Naked Single)
  70. Row 8 / Column 4 → 2 (Full House)
  71. Row 9 / Column 4 → 9 (Full House)
  72. Row 9 / Column 9 → 3 (Full House)
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