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

This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Single, Skyscraper, Turbot Fish, undefined, Full House, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 7 → 3 (Hidden Single)
2. Row 6 / Column 7 → 7 (Hidden Single)
3. Row 3 / Column 7 → 9 (Hidden Single)
4. Row 7 / Column 8 → 1 (Hidden Single)
5. Row 6 / Column 5 → 1 (Hidden Single)
6. Row 4 / Column 7 → 1 (Hidden Single)
7. Row 9 / Column 9 → 9 (Hidden Single)
8. Row 9 / Column 8 → 7 (Hidden Single)
9. Row 6 / Column 3 → 3 (Hidden Single)
10. Row 4 / Column 9 → 6 (Hidden Single)
11. Row 9 / Column 2 → 3 (Hidden Single)
12. Locked Candidates Type 1 (Pointing): 4 in b3 => r2c12356<>4
13. Locked Candidates Type 1 (Pointing): 5 in b9 => r2c7<>5
14. Locked Candidates Type 1 (Pointing): 6 in b9 => r2c7<>6
15. Naked Pair: 2,4 in r4c5,r6c4 => r5c456<>2, r5c456<>4
16. Row 5 / Column 5 → 3 (Naked Single)
17. Row 8 / Column 6 → 3 (Hidden Single)
18. Row 8 / Column 1 → 7 (Hidden Single)
19. Row 7 / Column 6 → 7 (Hidden Single)
20. Row 2 / Column 2 → 7 (Hidden Single)
21. Row 8 / Column 7 → 6 (Hidden Single)
22. Row 9 / Column 1 → 6 (Hidden Single)
23. Row 7 / Column 4 → 9 (Hidden Single)
24. Row 5 / Column 4 → 6 (Naked Single)
25. Row 5 / Column 6 → 9 (Naked Single)
26. Row 2 / Column 6 → 1 (Hidden Single)
27. Row 1 / Column 2 → 1 (Hidden Single)
28. Row 8 / Column 5 → 5 (Hidden Single)
29. Row 9 / Column 7 → 5 (Hidden Single)
30. Row 2 / Column 8 → 6 (Hidden Single)
31. Row 1 / Column 6 → 6 (Hidden Single)
32. Row 2 / Column 1 → 5 (Hidden Single)
33. Row 4 / Column 2 → 5 (Hidden Single)
34. Row 2 / Column 3 → 9 (Hidden Single)
35. Row 4 / Column 1 → 9 (Hidden Single)
36. Skyscraper: 8 in r6c1,r8c3 (connected by r68c9) => r7c1<>8
37. Turbot Fish: 4 r1c3 =4= r4c3 -4- r4c5 =4= r6c4 => r1c4<>4
38. Locked Candidates Type 1 (Pointing): 4 in b2 => r3c2<>4
39. W-Wing: 2/4 in r4c3,r7c1 connected by 4 in r1c13 => r6c1,r8c3<>2
40. Row 8 / Column 3 → 8 (Naked Single)
41. Row 8 / Column 9 → 2 (Full House)
42. Row 7 / Column 7 → 8 (Full House)
43. Row 6 / Column 4 → 2 (Hidden Single)
44. Row 4 / Column 5 → 4 (Full House)
45. Row 4 / Column 3 → 2 (Full House)
46. Row 1 / Column 3 → 4 (Full House)
47. Skyscraper: 8 in r1c1,r2c9 (connected by r6c19) => r1c8<>8
48. X-Wing: 8 c28 r35 => r3c4<>8
49. Bivalue Universal Grave + 1 => r3c8<>5, r3c8<>8
50. Row 3 / Column 8 → 2 (Naked Single)
51. Row 1 / Column 8 → 5 (Naked Single)
52. Row 5 / Column 8 → 8 (Full House)
53. Row 2 / Column 7 → 4 (Naked Single)
54. Row 2 / Column 9 → 8 (Full House)
55. Row 6 / Column 9 → 4 (Full House)
56. Row 5 / Column 7 → 2 (Full House)
57. Row 5 / Column 2 → 4 (Full House)
58. Row 2 / Column 5 → 2 (Full House)
59. Row 6 / Column 1 → 8 (Full House)
60. Row 9 / Column 5 → 8 (Full House)
61. Row 3 / Column 2 → 8 (Naked Single)
62. Row 7 / Column 2 → 2 (Full House)
63. Row 1 / Column 1 → 2 (Full House)
64. Row 1 / Column 4 → 8 (Full House)
65. Row 7 / Column 1 → 4 (Full House)
66. Row 3 / Column 6 → 4 (Naked Single)
67. Row 3 / Column 4 → 5 (Full House)
68. Row 9 / Column 4 → 4 (Full House)
69. Row 9 / Column 6 → 2 (Full House)