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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 5 → 3 (Hidden Single)
2. Row 4 / Column 2 → 3 (Hidden Single)
3. Row 7 / Column 2 → 5 (Hidden Single)
4. Row 8 / Column 9 → 3 (Hidden Single)
5. Locked Candidates Type 1 (Pointing): 8 in b5 => r4c79<>8
6. Locked Pair: 7,9 in r45c9 => r2c9,r4c7,r5c8<>7, r269c9,r46c7,r56c8<>9
7. Locked Candidates Type 1 (Pointing): 4 in b7 => r23c3<>4
8. Row 3 / Column 4 → 4 (Hidden Single)
9. Row 5 / Column 5 → 4 (Hidden Single)
10. Row 3 / Column 6 → 3 (Hidden Single)
11. Row 9 / Column 4 → 3 (Hidden Single)
12. Row 4 / Column 5 → 2 (Hidden Single)
13. Row 4 / Column 7 → 1 (Naked Single)
14. Row 4 / Column 4 → 8 (Hidden Single)
15. Row 5 / Column 2 → 1 (Hidden Single)
16. Row 3 / Column 2 → 7 (Naked Single)
17. Row 3 / Column 8 → 8 (Naked Single)
18. Row 3 / Column 3 → 1 (Full House)
19. Row 5 / Column 8 → 2 (Hidden Single)
20. Row 5 / Column 9 → 7 (Hidden Single)
21. Row 4 / Column 9 → 9 (Naked Single)
22. Row 4 / Column 1 → 6 (Naked Single)
23. Row 4 / Column 3 → 7 (Full House)
24. Row 2 / Column 3 → 8 (Hidden Single)
25. Row 8 / Column 1 → 1 (Hidden Single)
26. Row 9 / Column 8 → 1 (Hidden Single)
27. Row 6 / Column 8 → 6 (Hidden Single)
28. Locked Candidates Type 1 (Pointing): 6 in b1 => r9c2<>6
29. Naked Triple: 5,7,9 in r78c8,r8c7 => r7c7<>7, r79c7<>9
30. Hidden Pair: 2,4 in r7c37 => r7c3<>9, r7c7<>8
31. Locked Candidates Type 1 (Pointing): 8 in b9 => r9c6<>8
32. Naked Pair: 6,9 in r59c6 => r1c6<>6, r7c6<>9
33. XYZ-Wing: 6/7/8 in r1c56,r8c5 => r2c5<>7
34. Row 2 / Column 7 → 7 (Hidden Single)
35. Locked Candidates Type 1 (Pointing): 9 in b3 => r1c12<>9
36. Naked Triple: 1,5,6 in r12c4,r2c5 => r1c5<>6
37. W-Wing: 9/6 in r2c2,r8c3 connected by 6 in r28c5 => r9c2<>9
38. Row 9 / Column 2 → 2 (Naked Single)
39. Row 1 / Column 2 → 6 (Naked Single)
40. Row 2 / Column 2 → 9 (Full House)
41. Row 7 / Column 3 → 4 (Naked Single)
42. Row 1 / Column 4 → 5 (Naked Single)
43. Row 2 / Column 1 → 4 (Naked Single)
44. Row 1 / Column 1 → 2 (Full House)
45. Row 6 / Column 1 → 9 (Full House)
46. Row 6 / Column 3 → 2 (Full House)
47. Row 7 / Column 7 → 2 (Naked Single)
48. Row 1 / Column 8 → 9 (Naked Single)
49. Row 2 / Column 9 → 5 (Naked Single)
50. Row 1 / Column 7 → 4 (Full House)
51. Row 7 / Column 8 → 7 (Naked Single)
52. Row 8 / Column 8 → 5 (Full House)
53. Row 6 / Column 9 → 8 (Naked Single)
54. Row 6 / Column 7 → 5 (Full House)
55. Row 9 / Column 9 → 4 (Full House)
56. Row 9 / Column 7 → 8 (Naked Single)
57. Row 8 / Column 7 → 9 (Full House)
58. Row 7 / Column 6 → 8 (Naked Single)
59. Row 8 / Column 3 → 6 (Naked Single)
60. Row 8 / Column 5 → 7 (Full House)
61. Row 9 / Column 3 → 9 (Full House)
62. Row 9 / Column 6 → 6 (Full House)
63. Row 1 / Column 6 → 7 (Naked Single)
64. Row 1 / Column 5 → 8 (Full House)
65. Row 5 / Column 6 → 9 (Full House)
66. Row 5 / Column 4 → 6 (Full House)
67. Row 7 / Column 5 → 1 (Naked Single)
68. Row 2 / Column 5 → 6 (Full House)
69. Row 2 / Column 4 → 1 (Full House)
70. Row 7 / Column 4 → 9 (Full House)