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

This Sudoku Puzzle has 72 steps and it is solved using Hidden Single, Naked Single, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Pair, Locked Candidates Type 2 (Claiming), Hidden Pair, undefined, Full House, Uniqueness Test 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 9 → 8 (Hidden Single)
2. Row 8 / Column 3 → 8 (Hidden Single)
3. Row 9 / Column 6 → 8 (Hidden Single)
4. Row 1 / Column 9 → 2 (Hidden Single)
5. Row 6 / Column 4 → 8 (Hidden Single)
6. Row 6 / Column 7 → 5 (Naked Single)
7. Row 5 / Column 7 → 7 (Naked Single)
8. Row 4 / Column 7 → 8 (Naked Single)
9. Locked Pair: 2,4 in r46c3 => r35c3,r46c2,r5c1<>4, r7c3<>2
10. Row 5 / Column 3 → 5 (Naked Single)
11. Locked Candidates Type 1 (Pointing): 3 in b3 => r3c46<>3
12. Locked Candidates Type 1 (Pointing): 3 in b4 => r79c2<>3
13. Locked Candidates Type 1 (Pointing): 4 in b5 => r23c6<>4
14. Locked Candidates Type 1 (Pointing): 6 in b5 => r8c5<>6
15. Naked Pair: 1,7 in r1c2,r3c3 => r2c2<>1
16. Locked Candidates Type 2 (Claiming): 1 in r2 => r1c45,r3c46<>1
17. Naked Pair: 2,4 in r4c38 => r4c6<>4
18. Hidden Pair: 6,9 in r7c7,r8c8 => r7c7<>3, r8c8<>4
19. Row 3 / Column 7 → 3 (Hidden Single)
20. Naked Pair: 1,5 in r1c8,r3c9 => r3c8<>1, r3c8<>5
21. W-Wing: 6/9 in r3c8,r5c1 connected by 9 in r8c18 => r3c1<>6
22. Row 3 / Column 8 → 6 (Hidden Single)
23. Row 2 / Column 7 → 9 (Naked Single)
24. Row 7 / Column 7 → 6 (Full House)
25. Row 8 / Column 8 → 9 (Naked Single)
26. Row 8 / Column 4 → 6 (Hidden Single)
27. Row 3 / Column 6 → 9 (Hidden Single)
28. Naked Pair: 1,4 in r5c69 => r5c5<>1
29. W-Wing: 4/5 in r3c1,r9c8 connected by 5 in r1c8,r3c9 => r9c1<>4
30. Row 9 / Column 1 → 3 (Naked Single)
31. Uniqueness Test 1: 2/4 in r4c38,r6c38 => r6c8<>2, r6c8<>4
32. Row 6 / Column 8 → 1 (Naked Single)
33. Row 1 / Column 8 → 5 (Naked Single)
34. Row 3 / Column 9 → 1 (Full House)
35. Row 5 / Column 9 → 4 (Naked Single)
36. Row 4 / Column 8 → 2 (Full House)
37. Row 9 / Column 8 → 4 (Full House)
38. Row 3 / Column 3 → 7 (Naked Single)
39. Row 5 / Column 6 → 1 (Naked Single)
40. Row 4 / Column 3 → 4 (Naked Single)
41. Row 1 / Column 2 → 1 (Naked Single)
42. Row 3 / Column 4 → 4 (Naked Single)
43. Row 3 / Column 1 → 5 (Full House)
44. Row 7 / Column 3 → 1 (Naked Single)
45. Row 6 / Column 3 → 2 (Full House)
46. Row 9 / Column 2 → 7 (Naked Single)
47. Row 2 / Column 4 → 1 (Naked Single)
48. Row 7 / Column 2 → 9 (Naked Single)
49. Row 9 / Column 9 → 5 (Naked Single)
50. Row 9 / Column 5 → 1 (Full House)
51. Row 4 / Column 2 → 3 (Naked Single)
52. Row 7 / Column 1 → 2 (Naked Single)
53. Row 8 / Column 1 → 4 (Full House)
54. Row 4 / Column 6 → 7 (Naked Single)
55. Row 4 / Column 5 → 9 (Full House)
56. Row 6 / Column 2 → 6 (Naked Single)
57. Row 2 / Column 2 → 4 (Full House)
58. Row 2 / Column 1 → 6 (Full House)
59. Row 5 / Column 1 → 9 (Full House)
60. Row 5 / Column 5 → 6 (Full House)
61. Row 6 / Column 5 → 3 (Naked Single)
62. Row 6 / Column 6 → 4 (Full House)
63. Row 1 / Column 5 → 7 (Naked Single)
64. Row 1 / Column 4 → 3 (Full House)
65. Row 7 / Column 4 → 7 (Full House)
66. Row 8 / Column 5 → 2 (Naked Single)
67. Row 2 / Column 5 → 5 (Full House)
68. Row 2 / Column 6 → 2 (Full House)
69. Row 7 / Column 9 → 3 (Naked Single)
70. Row 7 / Column 6 → 5 (Full House)
71. Row 8 / Column 6 → 3 (Full House)
72. Row 8 / Column 9 → 7 (Full House)