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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Single, Skyscraper, AIC, Discontinuous Nice Loop, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 5 → 6 (Hidden Single)
2. Row 8 / Column 6 → 7 (Hidden Single)
3. Row 5 / Column 6 → 1 (Hidden Single)
4. Row 1 / Column 6 → 5 (Hidden Single)
5. Row 5 / Column 9 → 4 (Hidden Single)
6. Row 6 / Column 6 → 4 (Hidden Single)
7. Locked Candidates Type 1 (Pointing): 2 in b4 => r5c7<>2
8. Locked Candidates Type 2 (Claiming): 9 in r5 => r46c2<>9
9. Naked Pair: 1,3 in r8c49 => r8c18<>1, r8c128<>3
10. Row 8 / Column 1 → 6 (Naked Single)
11. Row 3 / Column 1 → 3 (Naked Single)
12. Skyscraper: 1 in r3c5,r8c4 (connected by r38c9) => r2c4,r79c5<>1
13. AIC: 6 6- r3c7 =6= r3c2 =4= r8c2 =5= r8c8 -5- r4c8 =5= r4c7 =2= r9c7 =6= r9c8 -6 => r12c8,r9c7<>6
14. Row 9 / Column 8 → 6 (Hidden Single)
15. Discontinuous Nice Loop: 3/8 r1c5 =4= r1c3 -4- r7c3 =4= r7c8 =1= r2c8 -1- r2c5 =1= r3c5 =4= r1c5 => r1c5<>3, r1c5<>8
16. Row 1 / Column 5 → 4 (Naked Single)
17. Naked Pair: 1,8 in r3c59 => r3c7<>8
18. Row 3 / Column 7 → 6 (Naked Single)
19. Row 1 / Column 4 → 6 (Hidden Single)
20. Row 2 / Column 2 → 6 (Hidden Single)
21. Row 3 / Column 5 → 8 (Hidden Single)
22. Row 3 / Column 9 → 1 (Naked Single)
23. Row 8 / Column 9 → 3 (Naked Single)
24. Row 8 / Column 4 → 1 (Naked Single)
25. Row 2 / Column 5 → 1 (Hidden Single)
26. Row 7 / Column 8 → 1 (Hidden Single)
27. Row 9 / Column 1 → 1 (Hidden Single)
28. Row 7 / Column 3 → 4 (Hidden Single)
29. Row 3 / Column 3 → 5 (Naked Single)
30. Row 3 / Column 2 → 4 (Full House)
31. Row 8 / Column 2 → 5 (Naked Single)
32. Row 8 / Column 8 → 4 (Full House)
33. Row 4 / Column 8 → 5 (Hidden Single)
34. Row 4 / Column 4 → 9 (Hidden Single)
35. Row 6 / Column 5 → 3 (Naked Single)
36. Row 7 / Column 4 → 3 (Naked Single)
37. Row 4 / Column 6 → 2 (Naked Single)
38. Row 2 / Column 6 → 3 (Full House)
39. Row 2 / Column 4 → 2 (Full House)
40. Row 6 / Column 4 → 8 (Full House)
41. Row 4 / Column 7 → 3 (Naked Single)
42. Row 4 / Column 2 → 8 (Full House)
43. Row 6 / Column 2 → 7 (Naked Single)
44. Row 5 / Column 7 → 7 (Naked Single)
45. Row 6 / Column 8 → 9 (Naked Single)
46. Row 6 / Column 9 → 2 (Full House)
47. Row 1 / Column 7 → 8 (Naked Single)
48. Row 2 / Column 8 → 7 (Naked Single)
49. Row 1 / Column 8 → 3 (Full House)
50. Row 1 / Column 9 → 9 (Full House)
51. Row 2 / Column 3 → 9 (Full House)
52. Row 9 / Column 9 → 7 (Naked Single)
53. Row 7 / Column 9 → 8 (Full House)
54. Row 7 / Column 7 → 5 (Naked Single)
55. Row 9 / Column 7 → 2 (Full House)
56. Row 9 / Column 3 → 3 (Naked Single)
57. Row 7 / Column 5 → 9 (Naked Single)
58. Row 7 / Column 1 → 7 (Full House)
59. Row 9 / Column 2 → 9 (Full House)
60. Row 9 / Column 5 → 5 (Full House)
61. Row 5 / Column 2 → 3 (Full House)
62. Row 5 / Column 3 → 2 (Naked Single)
63. Row 1 / Column 3 → 7 (Full House)
64. Row 1 / Column 1 → 2 (Full House)
65. Row 5 / Column 1 → 9 (Full House)