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This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Continuous Nice Loop, Discontinuous Nice Loop, Naked Single, AIC, Full House, Naked Triple techniques.

Try To Solve This Puzzle

Solution Steps:

1. Row 4 / Column 8 → 9 (Hidden Single)
2. Row 3 / Column 3 → 8 (Hidden Single)
3. Locked Candidates Type 1 (Pointing): 2 in b2 => r2c78<>2
4. Locked Candidates Type 1 (Pointing): 6 in b2 => r4579c5<>6
5. Locked Candidates Type 1 (Pointing): 1 in b6 => r5c56<>1
6. Naked Pair: 2,7 in r26c6 => r45c6<>2, r4578c6<>7
7. 2-String Kite: 6 in r5c1,r8c4 (connected by r4c4,r5c6) => r8c1<>6
8. XYZ-Wing: 2/6/7 in r48c4,r6c6 => r6c4<>7
9. Finned X-Wing: 9 r28 c27 fr8c1 => r9c2<>9
10. Continuous Nice Loop: 2/3/6/7 4= r4c5 =1= r4c6 =3= r5c6 =6= r5c1 =5= r5c5 =4= r4c5 =1 => r5c1<>2, r5c1<>3, r4c6<>6, r45c5,r5c1<>7
11. Discontinuous Nice Loop: 2/5/6/7 r1c7 =4= r1c8 -4- r6c8 =4= r6c2 =5= r6c4 -5- r5c5 -4- r5c7 =4= r1c7 => r1c7<>2, r1c7<>5, r1c7<>6, r1c7<>7
12. Row 1 / Column 7 → 4 (Naked Single)
13. Finned X-Wing: 5 r15 c15 fr1c2 => r3c1<>5
14. AIC: 3 3- r4c6 -1- r4c5 -4- r4c2 =4= r6c2 =5= r5c1 =6= r5c6 =3= r5c3 -3 => r4c123,r5c6<>3
15. Row 5 / Column 6 → 6 (Naked Single)
16. Row 5 / Column 1 → 5 (Naked Single)
17. Row 7 / Column 6 → 8 (Naked Single)
18. Row 5 / Column 5 → 4 (Naked Single)
19. Row 8 / Column 6 → 1 (Naked Single)
20. Row 4 / Column 5 → 1 (Naked Single)
21. Row 4 / Column 6 → 3 (Naked Single)
22. Row 5 / Column 3 → 3 (Hidden Single)
23. Row 8 / Column 4 → 6 (Hidden Single)
24. Row 6 / Column 4 → 5 (Hidden Single)
25. Row 8 / Column 1 → 8 (Hidden Single)
26. Row 4 / Column 2 → 4 (Hidden Single)
27. Row 6 / Column 2 → 7 (Naked Single)
28. Row 4 / Column 3 → 2 (Naked Single)
29. Row 4 / Column 1 → 6 (Full House)
30. Row 4 / Column 4 → 7 (Full House)
31. Row 6 / Column 6 → 2 (Full House)
32. Row 9 / Column 3 → 7 (Full House)
33. Row 2 / Column 4 → 2 (Full House)
34. Row 2 / Column 6 → 7 (Full House)
35. Row 6 / Column 8 → 4 (Full House)
36. Row 9 / Column 5 → 9 (Naked Single)
37. Row 7 / Column 5 → 7 (Full House)
38. Row 2 / Column 8 → 1 (Naked Single)
39. Row 9 / Column 2 → 6 (Hidden Single)
40. Row 7 / Column 7 → 6 (Hidden Single)
41. Naked Triple: 5,7,9 in r238c7 => r5c7<>7
42. X-Wing: 9 r28 c27 => r3c7<>9
43. 2-String Kite: 3 in r1c2,r9c9 (connected by r8c2,r9c1) => r1c9<>3
44. W-Wing: 7/3 in r1c1,r8c8 connected by 3 in r9c19 => r1c8<>7
45. XY-Wing: 3/7/2 in r1c19,r9c1 => r9c9<>2
46. XY-Wing: 2/9/7 in r17c9,r8c7 => r3c7<>7
47. Row 3 / Column 7 → 5 (Naked Single)
48. Row 2 / Column 7 → 9 (Naked Single)
49. Row 2 / Column 2 → 5 (Full House)
50. Row 3 / Column 5 → 6 (Naked Single)
51. Row 1 / Column 5 → 5 (Full House)
52. Row 8 / Column 7 → 7 (Naked Single)
53. Row 1 / Column 2 → 3 (Naked Single)
54. Row 8 / Column 2 → 9 (Full House)
55. Row 8 / Column 8 → 3 (Full House)
56. Row 1 / Column 1 → 7 (Naked Single)
57. Row 3 / Column 1 → 9 (Full House)
58. Row 7 / Column 1 → 2 (Naked Single)
59. Row 7 / Column 9 → 9 (Full House)
60. Row 9 / Column 1 → 3 (Full House)
61. Row 3 / Column 8 → 7 (Naked Single)
62. Row 3 / Column 9 → 3 (Full House)
63. Row 9 / Column 9 → 1 (Naked Single)
64. Row 9 / Column 7 → 2 (Full House)
65. Row 5 / Column 7 → 1 (Full House)
66. Row 1 / Column 9 → 2 (Naked Single)
67. Row 1 / Column 8 → 6 (Full House)
68. Row 5 / Column 8 → 2 (Full House)
69. Row 5 / Column 9 → 7 (Full House)