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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Locked Pair, Naked Single, Empty Rectangle, Uniqueness Test 3, Locked Candidates Type 1 (Pointing), Naked Pair, Skyscraper, Full House techniques.

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

Solution Steps:

  1. Row 7 / Column 5 → 6 (Hidden Single)
  2. Row 9 / Column 1 → 4 (Hidden Single)
  3. Row 6 / Column 6 → 5 (Hidden Single)
  4. Row 1 / Column 7 → 6 (Hidden Single)
  5. Row 9 / Column 3 → 1 (Hidden Single)
  6. Row 4 / Column 1 → 6 (Hidden Single)
  7. Row 2 / Column 3 → 6 (Hidden Single)
  8. Row 3 / Column 1 → 1 (Hidden Single)
  9. Row 8 / Column 9 → 6 (Hidden Single)
  10. Row 6 / Column 8 → 6 (Hidden Single)
  11. Row 5 / Column 9 → 1 (Hidden Single)
  12. Row 8 / Column 8 → 5 (Hidden Single)
  13. Row 5 / Column 8 → 4 (Hidden Single)
  14. Locked Pair: 1,9 in r46c2 => r56c3,r8c2<>9
  15. Row 6 / Column 3 → 2 (Naked Single)
  16. Row 8 / Column 1 → 2 (Hidden Single)
  17. Empty Rectangle: 9 in b2 (r5c57) => r3c7<>9
  18. Uniqueness Test 3: 1/9 in r4c24,r6c24 => r8c4<>8
  19. Row 8 / Column 4 → 9 (Naked Single)
  20. Row 7 / Column 3 → 9 (Hidden Single)
  21. Locked Candidates Type 1 (Pointing): 7 in b7 => r8c6<>7
  22. Locked Candidates Type 1 (Pointing): 7 in b8 => r9c789<>7
  23. Naked Pair: 7,8 in r37c7 => r9c7<>8
  24. Skyscraper: 8 in r1c1,r3c7 (connected by r7c17) => r1c8,r3c3<>8
  25. Locked Candidates Type 1 (Pointing): 8 in b1 => r1c5<>8
  26. Skyscraper: 8 in r7c7,r9c5 (connected by r3c57) => r9c8<>8
  27. Row 7 / Column 7 → 8 (Hidden Single)
  28. Row 3 / Column 7 → 7 (Naked Single)
  29. Row 7 / Column 1 → 3 (Naked Single)
  30. Row 7 / Column 9 → 7 (Full House)
  31. Row 5 / Column 1 → 5 (Naked Single)
  32. Row 1 / Column 1 → 8 (Full House)
  33. Row 8 / Column 2 → 7 (Naked Single)
  34. Row 8 / Column 3 → 8 (Full House)
  35. Row 8 / Column 6 → 3 (Full House)
  36. Row 5 / Column 3 → 3 (Naked Single)
  37. Row 1 / Column 2 → 4 (Naked Single)
  38. Row 3 / Column 3 → 5 (Naked Single)
  39. Row 1 / Column 3 → 7 (Full House)
  40. Row 2 / Column 2 → 3 (Full House)
  41. Row 4 / Column 8 → 7 (Hidden Single)
  42. Row 2 / Column 6 → 7 (Hidden Single)
  43. Row 9 / Column 6 → 8 (Naked Single)
  44. Row 9 / Column 5 → 7 (Full House)
  45. Row 3 / Column 6 → 9 (Naked Single)
  46. Row 4 / Column 6 → 2 (Full House)
  47. Row 1 / Column 5 → 2 (Naked Single)
  48. Row 4 / Column 9 → 9 (Naked Single)
  49. Row 5 / Column 7 → 2 (Full House)
  50. Row 5 / Column 5 → 9 (Full House)
  51. Row 9 / Column 7 → 9 (Full House)
  52. Row 1 / Column 8 → 9 (Naked Single)
  53. Row 1 / Column 9 → 5 (Full House)
  54. Row 4 / Column 2 → 1 (Naked Single)
  55. Row 4 / Column 4 → 8 (Full House)
  56. Row 6 / Column 2 → 9 (Full House)
  57. Row 6 / Column 5 → 4 (Naked Single)
  58. Row 3 / Column 5 → 8 (Full House)
  59. Row 2 / Column 4 → 4 (Full House)
  60. Row 6 / Column 4 → 1 (Full House)
  61. Row 3 / Column 8 → 3 (Naked Single)
  62. Row 3 / Column 9 → 4 (Full House)
  63. Row 2 / Column 9 → 2 (Naked Single)
  64. Row 2 / Column 8 → 8 (Full House)
  65. Row 9 / Column 8 → 2 (Full House)
  66. Row 9 / Column 9 → 3 (Full House)
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