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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Triple, Full House, undefined techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 2 → 5 (Hidden Single)
2. Row 6 / Column 7 → 5 (Hidden Single)
3. Row 8 / Column 5 → 3 (Hidden Single)
4. Row 2 / Column 9 → 8 (Hidden Single)
5. Row 5 / Column 1 → 2 (Hidden Single)
6. Row 4 / Column 6 → 3 (Hidden Single)
7. Row 8 / Column 9 → 2 (Hidden Single)
8. Locked Triple: 1,6,8 in r456c5 => r12c5<>1, r129c5,r5c46<>6, r1c5,r5c4<>8
9. Row 1 / Column 5 → 2 (Naked Single)
10. Row 3 / Column 2 → 2 (Hidden Single)
11. Row 2 / Column 7 → 2 (Hidden Single)
12. Row 9 / Column 4 → 2 (Hidden Single)
13. Locked Candidates Type 1 (Pointing): 7 in b5 => r5c38<>7
14. Row 1 / Column 8 → 7 (Hidden Single)
15. Row 4 / Column 7 → 7 (Hidden Single)
16. Row 5 / Column 8 → 4 (Hidden Single)
17. Locked Candidates Type 1 (Pointing): 9 in b5 => r5c3<>9
18. Locked Candidates Type 1 (Pointing): 1 in b7 => r46c2<>1
19. Naked Pair: 1,6 in r1c67 => r1c24<>6
20. Naked Triple: 4,6,8 in r4c12,r5c3 => r4c3<>4, r46c3,r6c12<>6, r4c3<>8
21. Row 6 / Column 2 → 3 (Naked Single)
22. Row 1 / Column 2 → 8 (Naked Single)
23. Row 6 / Column 1 → 7 (Naked Single)
24. Row 1 / Column 4 → 3 (Naked Single)
25. Row 2 / Column 1 → 3 (Hidden Single)
26. Row 3 / Column 4 → 8 (Hidden Single)
27. Row 5 / Column 3 → 8 (Hidden Single)
28. Row 5 / Column 5 → 6 (Naked Single)
29. Row 6 / Column 5 → 1 (Naked Single)
30. Row 4 / Column 5 → 8 (Naked Single)
31. Row 6 / Column 3 → 9 (Naked Single)
32. Row 6 / Column 9 → 6 (Full House)
33. Row 4 / Column 9 → 9 (Full House)
34. Row 4 / Column 3 → 1 (Naked Single)
35. Row 7 / Column 7 → 8 (Hidden Single)
36. Row 9 / Column 1 → 8 (Hidden Single)
37. Row 8 / Column 3 → 7 (Hidden Single)
38. Row 3 / Column 8 → 3 (Hidden Single)
39. W-Wing: 6/1 in r1c6,r7c8 connected by 1 in r2c68 => r7c6<>6
40. W-Wing: 9/6 in r2c4,r3c7 connected by 6 in r1c67 => r2c8,r3c6<>9
41. Row 9 / Column 8 → 9 (Hidden Single)
42. Row 3 / Column 7 → 9 (Hidden Single)
43. X-Wing: 6 c48 r27 => r2c36,r7c2<>6
44. Row 2 / Column 3 → 4 (Naked Single)
45. Row 3 / Column 3 → 6 (Full House)
46. Row 3 / Column 6 → 4 (Full House)
47. Row 2 / Column 5 → 5 (Naked Single)
48. Row 9 / Column 5 → 4 (Full House)
49. Row 7 / Column 6 → 7 (Naked Single)
50. Row 5 / Column 6 → 9 (Naked Single)
51. Row 5 / Column 4 → 7 (Full House)
52. Row 7 / Column 4 → 6 (Naked Single)
53. Row 2 / Column 4 → 9 (Full House)
54. Row 9 / Column 6 → 5 (Full House)
55. Row 2 / Column 6 → 1 (Naked Single)
56. Row 1 / Column 6 → 6 (Full House)
57. Row 2 / Column 8 → 6 (Full House)
58. Row 7 / Column 8 → 1 (Full House)
59. Row 1 / Column 7 → 1 (Full House)
60. Row 7 / Column 2 → 4 (Full House)
61. Row 9 / Column 7 → 6 (Naked Single)
62. Row 8 / Column 7 → 4 (Full House)
63. Row 8 / Column 1 → 6 (Full House)
64. Row 9 / Column 2 → 1 (Full House)
65. Row 4 / Column 2 → 6 (Full House)
66. Row 4 / Column 1 → 4 (Full House)