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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 3 → 8 (Naked Single)
2. Row 4 / Column 3 → 5 (Naked Single)
3. Row 2 / Column 3 → 7 (Naked Single)
4. Row 4 / Column 1 → 9 (Naked Single)
5. Row 9 / Column 3 → 3 (Naked Single)
6. Row 8 / Column 3 → 4 (Full House)
7. Row 4 / Column 2 → 2 (Naked Single)
8. Row 6 / Column 1 → 1 (Naked Single)
9. Row 5 / Column 2 → 7 (Full House)
10. Row 7 / Column 6 → 4 (Hidden Single)
11. Row 9 / Column 8 → 9 (Hidden Single)
12. Row 3 / Column 9 → 7 (Hidden Single)
13. Row 8 / Column 1 → 7 (Hidden Single)
14. Row 8 / Column 4 → 3 (Hidden Single)
15. Row 7 / Column 4 → 7 (Hidden Single)
16. Row 9 / Column 4 → 5 (Hidden Single)
17. Row 2 / Column 1 → 5 (Hidden Single)
18. Locked Candidates Type 1 (Pointing): 2 in b9 => r8c5<>2
19. Finned X-Wing: 2 c48 r35 fr6c4 => r5c6<>2
20. Row 5 / Column 6 → 8 (Naked Single)
21. Finned X-Wing: 6 c16 r39 fr1c6 fr2c6 => r3c4<>6
22. AIC: 4 4- r4c5 -6- r6c4 =6= r1c4 =8= r1c2 =4= r3c2 =9= r3c4 -9- r2c5 =9= r6c5 =4= r6c7 -4 => r4c78,r6c5<>4
23. Row 4 / Column 5 → 4 (Hidden Single)
24. Row 6 / Column 7 → 4 (Hidden Single)
25. Locked Candidates Type 1 (Pointing): 6 in b5 => r6c9<>6
26. Continuous Nice Loop: 2/3/6/8/9 9= r3c2 =4= r3c8 =2= r5c8 -2- r5c4 -9- r3c4 =9= r3c2 =4 => r5c79<>2, r3c8<>3, r3c28<>6, r3c2<>8, r6c4<>9
27. Row 3 / Column 6 → 3 (Hidden Single)
28. Row 4 / Column 8 → 3 (Hidden Single)
29. Row 2 / Column 9 → 3 (Hidden Single)
30. W-Wing: 6/8 in r4c9,r8c5 connected by 8 in r48c7 => r8c9<>6
31. XY-Chain: 6 6- r2c2 -9- r3c2 -4- r3c8 -2- r3c7 -6- r3c1 -8- r9c1 -6 => r3c1,r789c2<>6
32. Row 3 / Column 1 → 8 (Naked Single)
33. Row 9 / Column 1 → 6 (Full House)
34. Row 3 / Column 7 → 6 (Hidden Single)
35. Row 4 / Column 7 → 8 (Naked Single)
36. Row 4 / Column 9 → 6 (Full House)
37. Row 1 / Column 4 → 8 (Hidden Single)
38. Row 7 / Column 8 → 6 (Hidden Single)
39. Row 8 / Column 5 → 6 (Hidden Single)
40. Row 6 / Column 4 → 6 (Hidden Single)
41. W-Wing: 1/5 in r1c9,r5c7 connected by 5 in r15c8 => r2c7,r5c9<>1
42. Row 2 / Column 7 → 2 (Naked Single)
43. Row 3 / Column 8 → 4 (Naked Single)
44. Row 8 / Column 7 → 5 (Naked Single)
45. Row 5 / Column 7 → 1 (Full House)
46. Row 1 / Column 8 → 5 (Naked Single)
47. Row 1 / Column 9 → 1 (Full House)
48. Row 5 / Column 8 → 2 (Full House)
49. Row 3 / Column 2 → 9 (Naked Single)
50. Row 3 / Column 4 → 2 (Full House)
51. Row 5 / Column 4 → 9 (Full House)
52. Row 5 / Column 9 → 5 (Full House)
53. Row 6 / Column 9 → 9 (Full House)
54. Row 6 / Column 5 → 2 (Full House)
55. Row 7 / Column 9 → 8 (Naked Single)
56. Row 8 / Column 9 → 2 (Full House)
57. Row 8 / Column 2 → 8 (Full House)
58. Row 1 / Column 6 → 6 (Naked Single)
59. Row 1 / Column 2 → 4 (Full House)
60. Row 2 / Column 2 → 6 (Full House)
61. Row 7 / Column 5 → 1 (Naked Single)
62. Row 7 / Column 2 → 5 (Full House)
63. Row 9 / Column 2 → 1 (Full House)
64. Row 2 / Column 6 → 1 (Naked Single)
65. Row 2 / Column 5 → 9 (Full House)
66. Row 9 / Column 5 → 8 (Full House)
67. Row 9 / Column 6 → 2 (Full House)