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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Triple, undefined, Finned Swordfish, Continuous Nice Loop, Discontinuous Nice Loop, Naked Single, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 8 → 7 (Hidden Single)
2. Row 5 / Column 7 → 5 (Hidden Single)
3. Row 9 / Column 2 → 5 (Hidden Single)
4. Row 9 / Column 9 → 3 (Hidden Single)
5. Row 6 / Column 1 → 7 (Hidden Single)
6. Row 3 / Column 1 → 5 (Hidden Single)
7. Row 1 / Column 8 → 5 (Hidden Single)
8. Row 7 / Column 6 → 5 (Hidden Single)
9. Row 6 / Column 4 → 5 (Hidden Single)
10. Row 6 / Column 8 → 2 (Hidden Single)
11. Row 4 / Column 1 → 2 (Hidden Single)
12. Row 3 / Column 3 → 8 (Hidden Single)
13. Locked Candidates Type 1 (Pointing): 1 in b3 => r1c13<>1
14. Locked Candidates Type 1 (Pointing): 8 in b6 => r4c246<>8
15. Row 1 / Column 4 → 8 (Hidden Single)
16. Row 6 / Column 6 → 8 (Hidden Single)
17. Row 1 / Column 6 → 6 (Hidden Single)
18. Row 5 / Column 2 → 8 (Hidden Single)
19. Row 8 / Column 6 → 2 (Hidden Single)
20. Row 9 / Column 7 → 2 (Hidden Single)
21. Row 9 / Column 5 → 7 (Hidden Single)
22. Naked Triple: 1,4,9 in r138c7 => r47c7<>4, r47c7<>9, r7c7<>1
23. X-Wing: 3 c35 r15 => r15c1<>3
24. Finned X-Wing: 1 c35 r67 fr9c3 => r7c1<>1
25. Sashimi X-Wing: 1 r49 c24 fr9c1 fr9c3 => r8c2<>1
26. Finned Swordfish: 1 r249 c124 fr9c3 => r8c1<>1
27. Continuous Nice Loop: 3/4/9 3= r1c5 =2= r1c9 =1= r1c7 -1- r8c7 =1= r8c4 =6= r8c1 =3= r2c1 -3- r2c6 =3= r1c5 =2 => r2c2<>3, r1c59,r8c14<>4, r1c59,r8c1<>9
28. Discontinuous Nice Loop: 1/4/9 r4c2 =3= r8c2 -3- r8c1 -6- r5c1 =6= r5c3 =3= r4c2 => r4c2<>1, r4c2<>4, r4c2<>9
29. Row 4 / Column 2 → 3 (Naked Single)
30. Row 4 / Column 6 → 4 (Naked Single)
31. Row 2 / Column 6 → 3 (Full House)
32. Row 1 / Column 5 → 2 (Naked Single)
33. Row 1 / Column 9 → 1 (Naked Single)
34. Row 4 / Column 4 → 1 (Hidden Single)
35. Row 6 / Column 5 → 9 (Naked Single)
36. Row 5 / Column 5 → 3 (Full House)
37. Row 8 / Column 4 → 6 (Naked Single)
38. Row 3 / Column 5 → 4 (Naked Single)
39. Row 2 / Column 4 → 9 (Full House)
40. Row 9 / Column 4 → 4 (Full House)
41. Row 7 / Column 5 → 1 (Full House)
42. Row 8 / Column 1 → 3 (Naked Single)
43. Row 3 / Column 7 → 9 (Naked Single)
44. Row 3 / Column 9 → 2 (Full House)
45. Row 1 / Column 7 → 4 (Full House)
46. Row 9 / Column 8 → 8 (Naked Single)
47. Row 1 / Column 1 → 9 (Naked Single)
48. Row 1 / Column 3 → 3 (Full House)
49. Row 8 / Column 7 → 1 (Naked Single)
50. Row 4 / Column 8 → 9 (Naked Single)
51. Row 8 / Column 8 → 4 (Full House)
52. Row 8 / Column 2 → 9 (Full House)
53. Row 7 / Column 7 → 7 (Naked Single)
54. Row 4 / Column 7 → 8 (Full House)
55. Row 4 / Column 9 → 7 (Full House)
56. Row 5 / Column 9 → 4 (Full House)
57. Row 7 / Column 9 → 9 (Full House)
58. Row 7 / Column 3 → 4 (Naked Single)
59. Row 7 / Column 1 → 8 (Full House)
60. Row 5 / Column 1 → 6 (Naked Single)
61. Row 5 / Column 3 → 9 (Full House)
62. Row 6 / Column 3 → 1 (Naked Single)
63. Row 6 / Column 2 → 4 (Full House)
64. Row 9 / Column 3 → 6 (Full House)
65. Row 9 / Column 1 → 1 (Full House)
66. Row 2 / Column 2 → 1 (Full House)
67. Row 2 / Column 1 → 4 (Full House)