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

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.

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)