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

This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Locked Triple, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, Naked Pair, undefined, Full House, Uniqueness Test 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 2 → 7 (Naked Single)
2. Row 4 / Column 8 → 3 (Hidden Single)
3. Row 9 / Column 9 → 3 (Hidden Single)
4. Row 8 / Column 2 → 3 (Hidden Single)
5. Row 6 / Column 9 → 7 (Hidden Single)
6. Row 7 / Column 2 → 8 (Hidden Single)
7. Row 5 / Column 9 → 9 (Hidden Single)
8. Row 9 / Column 7 → 8 (Hidden Single)
9. Row 9 / Column 3 → 6 (Hidden Single)
10. Row 7 / Column 3 → 9 (Hidden Single)
11. Row 9 / Column 5 → 9 (Hidden Single)
12. Locked Triple: 1,2,5 in r123c3 => r13c1,r5c3<>2, r13c1,r58c3<>5, r13c1<>1
13. Locked Candidates Type 1 (Pointing): 4 in b4 => r5c45<>4
14. Row 5 / Column 5 → 2 (Naked Single)
15. Row 4 / Column 1 → 2 (Hidden Single)
16. Locked Candidates Type 1 (Pointing): 6 in b6 => r17c7<>6
17. Locked Candidates Type 1 (Pointing): 5 in b7 => r5c1<>5
18. Naked Triple: 1,4,5 in r7c5,r9c46 => r7c6<>1, r78c6,r8c4<>4, r78c6,r8c4<>5
19. Locked Candidates Type 1 (Pointing): 5 in b8 => r9c1<>5
20. Hidden Pair: 7,8 in r18c4 => r1c4<>1, r18c4<>2, r1c4<>6
21. Row 2 / Column 4 → 2 (Hidden Single)
22. Row 2 / Column 3 → 1 (Naked Single)
23. Locked Candidates Type 1 (Pointing): 6 in b2 => r4c6<>6
24. Naked Pair: 2,5 in r3c39 => r3c78<>5, r3c8<>2
25. Locked Candidates Type 1 (Pointing): 2 in b3 => r7c9<>2
26. X-Wing: 4 c57 r37 => r3c68,r7c18<>4
27. Row 3 / Column 8 → 1 (Naked Single)
28. Row 6 / Column 8 → 5 (Naked Single)
29. Row 5 / Column 7 → 6 (Naked Single)
30. Row 4 / Column 7 → 1 (Full House)
31. Row 6 / Column 2 → 9 (Naked Single)
32. Row 4 / Column 2 → 5 (Full House)
33. Row 5 / Column 4 → 5 (Naked Single)
34. Row 4 / Column 4 → 6 (Naked Single)
35. Row 4 / Column 6 → 9 (Full House)
36. Row 8 / Column 1 → 5 (Hidden Single)
37. Row 9 / Column 6 → 5 (Hidden Single)
38. Naked Pair: 7,8 in r1c4,r3c6 => r1c6<>7, r1c6<>8
39. Uniqueness Test 1: 2/5 in r1c39,r3c39 => r1c9<>2, r1c9<>5
40. Row 1 / Column 9 → 6 (Naked Single)
41. Row 1 / Column 6 → 1 (Naked Single)
42. Row 2 / Column 8 → 4 (Naked Single)
43. Row 2 / Column 6 → 6 (Full House)
44. Row 7 / Column 9 → 5 (Naked Single)
45. Row 3 / Column 9 → 2 (Full House)
46. Row 1 / Column 5 → 3 (Naked Single)
47. Row 6 / Column 6 → 4 (Naked Single)
48. Row 6 / Column 4 → 1 (Full House)
49. Row 3 / Column 7 → 7 (Naked Single)
50. Row 1 / Column 7 → 5 (Full House)
51. Row 7 / Column 7 → 4 (Full House)
52. Row 8 / Column 8 → 2 (Naked Single)
53. Row 7 / Column 8 → 6 (Full House)
54. Row 3 / Column 3 → 5 (Naked Single)
55. Row 1 / Column 1 → 8 (Naked Single)
56. Row 3 / Column 5 → 4 (Naked Single)
57. Row 7 / Column 5 → 1 (Full House)
58. Row 9 / Column 4 → 4 (Naked Single)
59. Row 9 / Column 1 → 1 (Full House)
60. Row 3 / Column 6 → 8 (Naked Single)
61. Row 1 / Column 4 → 7 (Full House)
62. Row 1 / Column 3 → 2 (Full House)
63. Row 3 / Column 1 → 3 (Full House)
64. Row 8 / Column 4 → 8 (Full House)
65. Row 7 / Column 1 → 7 (Naked Single)
66. Row 5 / Column 1 → 4 (Full House)
67. Row 7 / Column 6 → 2 (Full House)
68. Row 8 / Column 6 → 7 (Full House)
69. Row 8 / Column 3 → 4 (Full House)
70. Row 5 / Column 3 → 7 (Full House)