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

This Sudoku Puzzle has 72 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Full House, Naked Pair, Naked Triple, Hidden Pair, undefined techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 6 → 2 (Naked Single)
2. Row 1 / Column 1 → 9 (Hidden Single)
3. Row 4 / Column 6 → 9 (Hidden Single)
4. Row 8 / Column 6 → 7 (Hidden Single)
5. Row 6 / Column 6 → 4 (Hidden Single)
6. Locked Candidates Type 1 (Pointing): 1 in b2 => r56c5<>1
7. Locked Candidates Type 1 (Pointing): 5 in b2 => r79c5<>5
8. Locked Candidates Type 1 (Pointing): 4 in b3 => r3c123<>4
9. Locked Candidates Type 1 (Pointing): 6 in b3 => r3c56<>6
10. Row 3 / Column 6 → 8 (Naked Single)
11. Row 2 / Column 6 → 6 (Full House)
12. Row 3 / Column 1 → 3 (Naked Single)
13. Row 2 / Column 4 → 3 (Naked Single)
14. Row 2 / Column 8 → 2 (Naked Single)
15. Row 3 / Column 2 → 2 (Hidden Single)
16. Locked Candidates Type 1 (Pointing): 5 in b1 => r4c3<>5
17. Locked Candidates Type 1 (Pointing): 7 in b1 => r79c3<>7
18. Locked Candidates Type 1 (Pointing): 6 in b7 => r9c45<>6
19. Locked Candidates Type 1 (Pointing): 5 in b9 => r6c7<>5
20. Naked Pair: 4,8 in r27c1 => r5c1<>4, r59c1<>8
21. Naked Triple: 1,3,7 in r1c79,r3c8 => r3c79<>7, r3c9<>1
22. Hidden Pair: 2,5 in r79c7 => r7c7<>3, r79c7<>7, r79c7<>8
23. Locked Candidates Type 1 (Pointing): 7 in b9 => r145c9<>7
24. XY-Wing: 1/7/3 in r1c7,r38c8 => r8c7<>3
25. Row 8 / Column 7 → 8 (Naked Single)
26. Row 8 / Column 4 → 6 (Naked Single)
27. Row 4 / Column 4 → 7 (Naked Single)
28. Row 6 / Column 4 → 1 (Naked Single)
29. Row 5 / Column 4 → 2 (Naked Single)
30. Row 6 / Column 2 → 8 (Hidden Single)
31. Row 2 / Column 2 → 4 (Naked Single)
32. Row 2 / Column 1 → 8 (Full House)
33. Row 7 / Column 1 → 4 (Naked Single)
34. Row 5 / Column 9 → 8 (Hidden Single)
35. Row 3 / Column 8 → 7 (Hidden Single)
36. Row 1 / Column 7 → 3 (Naked Single)
37. Row 3 / Column 3 → 5 (Naked Single)
38. Row 1 / Column 3 → 7 (Full House)
39. Row 1 / Column 9 → 1 (Naked Single)
40. Row 1 / Column 5 → 5 (Full House)
41. Row 3 / Column 5 → 1 (Full House)
42. Row 6 / Column 7 → 6 (Naked Single)
43. Row 3 / Column 7 → 4 (Naked Single)
44. Row 3 / Column 9 → 6 (Full House)
45. Row 6 / Column 5 → 3 (Naked Single)
46. Row 5 / Column 5 → 6 (Full House)
47. Row 6 / Column 8 → 5 (Full House)
48. Row 5 / Column 7 → 7 (Naked Single)
49. Row 5 / Column 1 → 1 (Naked Single)
50. Row 9 / Column 1 → 6 (Full House)
51. Row 4 / Column 8 → 3 (Naked Single)
52. Row 4 / Column 9 → 4 (Full House)
53. Row 8 / Column 8 → 1 (Full House)
54. Row 5 / Column 2 → 3 (Naked Single)
55. Row 5 / Column 3 → 4 (Full House)
56. Row 9 / Column 3 → 8 (Naked Single)
57. Row 4 / Column 2 → 5 (Naked Single)
58. Row 4 / Column 3 → 6 (Full House)
59. Row 7 / Column 3 → 3 (Full House)
60. Row 8 / Column 2 → 9 (Naked Single)
61. Row 9 / Column 4 → 5 (Naked Single)
62. Row 7 / Column 4 → 8 (Full House)
63. Row 7 / Column 2 → 7 (Naked Single)
64. Row 9 / Column 2 → 1 (Full House)
65. Row 8 / Column 5 → 4 (Naked Single)
66. Row 8 / Column 9 → 3 (Full House)
67. Row 9 / Column 7 → 2 (Naked Single)
68. Row 7 / Column 7 → 5 (Full House)
69. Row 7 / Column 9 → 9 (Naked Single)
70. Row 7 / Column 5 → 2 (Full House)
71. Row 9 / Column 5 → 9 (Full House)
72. Row 9 / Column 9 → 7 (Full House)