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

This Sudoku Puzzle has 66 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Hidden Pair, Hidden Triple, undefined, Locked Candidates Type 2 (Claiming), Naked Pair techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 6 → 1 (Naked Single)
2. Row 7 / Column 6 → 8 (Naked Single)
3. Row 1 / Column 6 → 3 (Naked Single)
4. Row 1 / Column 4 → 8 (Naked Single)
5. Row 9 / Column 6 → 5 (Naked Single)
6. Row 5 / Column 6 → 9 (Full House)
7. Row 1 / Column 5 → 2 (Naked Single)
8. Row 2 / Column 1 → 3 (Hidden Single)
9. Row 2 / Column 5 → 9 (Hidden Single)
10. Row 7 / Column 4 → 1 (Hidden Single)
11. Row 9 / Column 2 → 8 (Hidden Single)
12. Locked Candidates Type 1 (Pointing): 1 in b1 => r4c2<>1
13. Locked Candidates Type 1 (Pointing): 6 in b1 => r457c2<>6
14. Hidden Pair: 7,9 in r47c2 => r4c2<>5, r7c2<>2
15. Row 7 / Column 1 → 2 (Hidden Single)
16. Hidden Triple: 1,7,9 in r4c12,r6c1 => r46c1<>5, r46c1<>6
17. X-Wing: 3 r59 c48 => r4c8<>3
18. 2-String Kite: 9 in r4c2,r9c8 (connected by r7c2,r9c1) => r4c8<>9
19. XY-Wing: 7/9/6 in r7c25,r9c1 => r9c4<>6
20. Row 9 / Column 4 → 3 (Naked Single)
21. Row 5 / Column 8 → 3 (Hidden Single)
22. Row 4 / Column 5 → 3 (Hidden Single)
23. Row 8 / Column 7 → 3 (Hidden Single)
24. Row 6 / Column 5 → 8 (Hidden Single)
25. Row 8 / Column 9 → 1 (Hidden Single)
26. Locked Candidates Type 2 (Claiming): 6 in c9 => r4c78,r6c78<>6
27. Naked Pair: 5,6 in r5c14 => r5c23<>5, r5c39<>6
28. Row 5 / Column 2 → 2 (Naked Single)
29. Row 3 / Column 2 → 6 (Naked Single)
30. Row 3 / Column 7 → 4 (Naked Single)
31. Row 3 / Column 4 → 7 (Naked Single)
32. Row 2 / Column 4 → 4 (Full House)
33. Row 3 / Column 8 → 2 (Full House)
34. Row 2 / Column 9 → 8 (Naked Single)
35. Row 4 / Column 9 → 6 (Naked Single)
36. Row 5 / Column 9 → 4 (Naked Single)
37. Row 6 / Column 9 → 2 (Full House)
38. Row 5 / Column 3 → 8 (Naked Single)
39. Row 4 / Column 3 → 5 (Naked Single)
40. Row 2 / Column 3 → 2 (Naked Single)
41. Row 4 / Column 8 → 1 (Naked Single)
42. Row 5 / Column 1 → 6 (Naked Single)
43. Row 5 / Column 4 → 5 (Full House)
44. Row 6 / Column 4 → 6 (Full House)
45. Row 8 / Column 3 → 6 (Naked Single)
46. Row 6 / Column 3 → 4 (Full House)
47. Row 9 / Column 1 → 9 (Naked Single)
48. Row 9 / Column 8 → 6 (Full House)
49. Row 8 / Column 5 → 7 (Naked Single)
50. Row 7 / Column 5 → 6 (Full House)
51. Row 8 / Column 1 → 5 (Full House)
52. Row 7 / Column 2 → 7 (Full House)
53. Row 4 / Column 1 → 7 (Naked Single)
54. Row 6 / Column 1 → 1 (Full House)
55. Row 4 / Column 2 → 9 (Full House)
56. Row 4 / Column 7 → 8 (Full House)
57. Row 1 / Column 8 → 5 (Naked Single)
58. Row 7 / Column 7 → 9 (Naked Single)
59. Row 7 / Column 8 → 4 (Full House)
60. Row 1 / Column 2 → 1 (Naked Single)
61. Row 1 / Column 7 → 6 (Full House)
62. Row 2 / Column 2 → 5 (Full House)
63. Row 2 / Column 7 → 1 (Naked Single)
64. Row 2 / Column 8 → 7 (Full House)
65. Row 6 / Column 8 → 9 (Full House)
66. Row 6 / Column 7 → 5 (Full House)