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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Skyscraper, Naked Single, undefined, Full House, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 7 → 7 (Hidden Single)
2. Row 5 / Column 5 → 7 (Hidden Single)
3. Row 6 / Column 8 → 2 (Hidden Single)
4. Row 8 / Column 1 → 9 (Hidden Single)
5. Row 3 / Column 4 → 2 (Hidden Single)
6. Row 6 / Column 6 → 8 (Hidden Single)
7. Row 2 / Column 5 → 9 (Hidden Single)
8. Row 4 / Column 4 → 9 (Hidden Single)
9. Row 2 / Column 7 → 2 (Hidden Single)
10. Row 7 / Column 6 → 2 (Hidden Single)
11. Row 7 / Column 2 → 7 (Hidden Single)
12. Row 8 / Column 6 → 7 (Hidden Single)
13. Row 9 / Column 8 → 7 (Hidden Single)
14. Row 7 / Column 1 → 8 (Hidden Single)
15. Row 2 / Column 2 → 8 (Hidden Single)
16. Row 5 / Column 8 → 8 (Hidden Single)
17. Row 2 / Column 4 → 6 (Hidden Single)
18. Row 1 / Column 3 → 6 (Hidden Single)
19. Row 8 / Column 2 → 6 (Hidden Single)
20. Locked Candidates Type 1 (Pointing): 3 in b1 => r9c1<>3
21. Locked Candidates Type 1 (Pointing): 3 in b4 => r9c2<>3
22. Skyscraper: 5 in r6c2,r8c3 (connected by r68c4) => r5c3,r9c2<>5
23. Row 9 / Column 2 → 1 (Naked Single)
24. Locked Candidates Type 1 (Pointing): 1 in b4 => r5c79<>1
25. Row 5 / Column 9 → 9 (Naked Single)
26. Row 5 / Column 7 → 5 (Naked Single)
27. Row 7 / Column 7 → 9 (Hidden Single)
28. Skyscraper: 1 in r6c9,r8c8 (connected by r68c4) => r4c8,r7c9<>1
29. Row 8 / Column 8 → 1 (Hidden Single)
30. W-Wing: 3/4 in r2c8,r9c7 connected by 4 in r4c78 => r1c7<>3
31. W-Wing: 4/1 in r1c7,r2c6 connected by 1 in r4c67 => r1c6,r2c8<>4
32. Row 2 / Column 8 → 3 (Naked Single)
33. Row 4 / Column 8 → 4 (Full House)
34. Row 2 / Column 6 → 4 (Hidden Single)
35. Row 2 / Column 1 → 1 (Full House)
36. Row 5 / Column 1 → 2 (Naked Single)
37. Row 5 / Column 3 → 1 (Full House)
38. Row 1 / Column 1 → 3 (Hidden Single)
39. Row 9 / Column 3 → 2 (Hidden Single)
40. Row 7 / Column 3 → 3 (Hidden Single)
41. Locked Candidates Type 1 (Pointing): 4 in b1 => r3c9<>4
42. Locked Candidates Type 1 (Pointing): 5 in b1 => r3c5<>5
43. X-Wing: 1 c67 r14 => r1c59<>1
44. Bivalue Universal Grave + 1 => r9c9<>3, r9c9<>6
45. Row 9 / Column 9 → 4 (Naked Single)
46. Row 1 / Column 9 → 8 (Naked Single)
47. Row 7 / Column 9 → 6 (Naked Single)
48. Row 9 / Column 7 → 3 (Full House)
49. Row 9 / Column 1 → 5 (Naked Single)
50. Row 3 / Column 1 → 4 (Full House)
51. Row 8 / Column 3 → 4 (Full House)
52. Row 9 / Column 5 → 6 (Full House)
53. Row 3 / Column 3 → 5 (Full House)
54. Row 8 / Column 4 → 5 (Full House)
55. Row 1 / Column 5 → 5 (Naked Single)
56. Row 3 / Column 9 → 1 (Naked Single)
57. Row 1 / Column 7 → 4 (Full House)
58. Row 4 / Column 7 → 1 (Full House)
59. Row 1 / Column 6 → 1 (Full House)
60. Row 3 / Column 5 → 8 (Full House)
61. Row 7 / Column 5 → 1 (Full House)
62. Row 6 / Column 9 → 3 (Full House)
63. Row 4 / Column 6 → 5 (Full House)
64. Row 6 / Column 4 → 1 (Full House)
65. Row 7 / Column 4 → 4 (Full House)
66. Row 6 / Column 2 → 5 (Full House)
67. Row 4 / Column 2 → 3 (Full House)