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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 9 → 4 (Naked Single)
2. Row 8 / Column 9 → 6 (Naked Single)
3. Row 1 / Column 9 → 1 (Naked Single)
4. Row 7 / Column 8 → 7 (Naked Single)
5. Row 9 / Column 9 → 8 (Naked Single)
6. Row 1 / Column 8 → 6 (Naked Single)
7. Row 9 / Column 8 → 1 (Naked Single)
8. Row 3 / Column 8 → 2 (Naked Single)
9. Row 2 / Column 7 → 7 (Full House)
10. Row 4 / Column 8 → 8 (Naked Single)
11. Row 5 / Column 8 → 5 (Full House)
12. Row 9 / Column 7 → 4 (Naked Single)
13. Row 8 / Column 7 → 5 (Full House)
14. Row 2 / Column 3 → 3 (Naked Single)
15. Row 2 / Column 5 → 2 (Naked Single)
16. Row 2 / Column 4 → 5 (Naked Single)
17. Row 2 / Column 1 → 8 (Full House)
18. Row 5 / Column 2 → 8 (Hidden Single)
19. Row 3 / Column 6 → 1 (Hidden Single)
20. Row 1 / Column 2 → 5 (Hidden Single)
21. Row 6 / Column 1 → 5 (Hidden Single)
22. Row 8 / Column 1 → 2 (Hidden Single)
23. Row 6 / Column 4 → 8 (Hidden Single)
24. Row 5 / Column 7 → 1 (Hidden Single)
25. Row 4 / Column 7 → 6 (Naked Single)
26. Row 6 / Column 7 → 2 (Full House)
27. Row 6 / Column 6 → 9 (Naked Single)
28. Row 6 / Column 9 → 3 (Naked Single)
29. Row 4 / Column 9 → 9 (Full House)
30. Row 4 / Column 1 → 3 (Hidden Single)
31. Skyscraper: 6 in r5c1,r7c2 (connected by r57c4) => r9c1<>6
32. Locked Candidates Type 1 (Pointing): 6 in b7 => r3c2<>6
33. Naked Pair: 4,9 in r38c2 => r7c2<>4, r9c2<>9
34. Locked Candidates Type 1 (Pointing): 4 in b7 => r8c5<>4
35. Turbot Fish: 4 r1c5 =4= r4c5 -4- r4c3 =4= r5c1 => r1c1<>4
36. Locked Candidates Type 1 (Pointing): 4 in b1 => r3c4<>4
37. Naked Pair: 7,9 in r19c1 => r3c1<>7, r3c1<>9
38. X-Wing: 7 c16 r19 => r1c45,r9c45<>7
39. Skyscraper: 9 in r3c4,r8c5 (connected by r38c2) => r1c5,r9c4<>9
40. Row 1 / Column 5 → 4 (Naked Single)
41. W-Wing: 4/7 in r4c4,r8c3 connected by 7 in r3c34 => r4c3<>4
42. Row 4 / Column 3 → 1 (Naked Single)
43. Row 4 / Column 5 → 7 (Naked Single)
44. Row 4 / Column 4 → 4 (Full House)
45. Row 6 / Column 3 → 6 (Naked Single)
46. Row 5 / Column 1 → 4 (Full House)
47. Row 6 / Column 5 → 1 (Full House)
48. Row 8 / Column 5 → 9 (Naked Single)
49. Row 9 / Column 5 → 6 (Full House)
50. Row 5 / Column 6 → 2 (Naked Single)
51. Row 5 / Column 4 → 6 (Full House)
52. Row 3 / Column 1 → 6 (Naked Single)
53. Row 8 / Column 2 → 4 (Naked Single)
54. Row 8 / Column 3 → 7 (Full House)
55. Row 3 / Column 3 → 4 (Full House)
56. Row 7 / Column 4 → 3 (Naked Single)
57. Row 9 / Column 2 → 3 (Naked Single)
58. Row 3 / Column 2 → 9 (Naked Single)
59. Row 7 / Column 2 → 6 (Full House)
60. Row 9 / Column 1 → 9 (Full House)
61. Row 7 / Column 6 → 4 (Full House)
62. Row 1 / Column 1 → 7 (Full House)
63. Row 3 / Column 4 → 7 (Full House)
64. Row 1 / Column 4 → 9 (Naked Single)
65. Row 9 / Column 4 → 2 (Full House)
66. Row 9 / Column 6 → 7 (Full House)
67. Row 1 / Column 6 → 3 (Full House)