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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 9 → 5 (Hidden Single)
2. Row 8 / Column 9 → 7 (Naked Single)
3. Row 8 / Column 7 → 8 (Hidden Single)
4. Row 7 / Column 2 → 3 (Hidden Single)
5. Row 9 / Column 2 → 6 (Hidden Single)
6. Row 7 / Column 1 → 2 (Naked Single)
7. Row 7 / Column 8 → 6 (Naked Single)
8. Row 2 / Column 7 → 6 (Hidden Single)
9. Row 9 / Column 5 → 4 (Hidden Single)
10. Row 6 / Column 4 → 6 (Hidden Single)
11. Row 8 / Column 6 → 6 (Hidden Single)
12. Row 3 / Column 7 → 7 (Hidden Single)
13. Row 4 / Column 1 → 6 (Hidden Single)
14. Row 8 / Column 8 → 5 (Hidden Single)
15. Row 4 / Column 6 → 8 (Hidden Single)
16. Row 7 / Column 6 → 7 (Naked Single)
17. Row 7 / Column 4 → 8 (Full House)
18. Row 8 / Column 5 → 2 (Hidden Single)
19. Row 4 / Column 7 → 2 (Hidden Single)
20. Row 9 / Column 7 → 1 (Naked Single)
21. Row 9 / Column 8 → 2 (Full House)
22. Row 5 / Column 7 → 4 (Naked Single)
23. Row 6 / Column 7 → 3 (Full House)
24. Row 4 / Column 5 → 3 (Hidden Single)
25. Row 3 / Column 6 → 3 (Hidden Single)
26. Row 2 / Column 8 → 3 (Hidden Single)
27. Row 5 / Column 6 → 2 (Hidden Single)
28. Row 9 / Column 6 → 5 (Hidden Single)
29. Row 9 / Column 4 → 9 (Full House)
30. Locked Candidates Type 1 (Pointing): 9 in b5 => r6c13<>9
31. Locked Candidates Type 2 (Claiming): 4 in c2 => r3c13<>4
32. Naked Pair: 1,7 in r15c4 => r23c4<>1, r2c4<>7
33. Locked Candidates Type 1 (Pointing): 1 in b2 => r1c8<>1
34. X-Wing: 7 r15 c24 => r2c2<>7
35. 2-String Kite: 1 in r3c8,r4c3 (connected by r4c9,r5c8) => r3c3<>1
36. W-Wing: 9/1 in r1c6,r5c8 connected by 1 in r15c4 => r1c8<>9
37. Row 1 / Column 8 → 4 (Naked Single)
38. Row 3 / Column 2 → 4 (Hidden Single)
39. Remote Pair: 9/1 r3c8 -1- r5c8 -9- r4c9 -1- r4c3 => r3c3<>9
40. Row 3 / Column 3 → 2 (Naked Single)
41. Row 3 / Column 4 → 5 (Naked Single)
42. Row 2 / Column 4 → 2 (Naked Single)
43. Row 2 / Column 1 → 5 (Hidden Single)
44. Row 2 / Column 2 → 8 (Hidden Single)
45. Row 5 / Column 1 → 8 (Hidden Single)
46. X-Wing: 1 r24 c39 => r6c3<>1
47. Bivalue Universal Grave + 1 => r2c3<>1, r2c3<>7
48. Row 2 / Column 3 → 9 (Naked Single)
49. Row 1 / Column 2 → 7 (Naked Single)
50. Row 3 / Column 1 → 1 (Full House)
51. Row 5 / Column 2 → 9 (Full House)
52. Row 3 / Column 8 → 9 (Full House)
53. Row 2 / Column 9 → 1 (Full House)
54. Row 2 / Column 5 → 7 (Full House)
55. Row 5 / Column 8 → 1 (Full House)
56. Row 4 / Column 9 → 9 (Full House)
57. Row 4 / Column 3 → 1 (Full House)
58. Row 6 / Column 5 → 9 (Full House)
59. Row 5 / Column 4 → 7 (Full House)
60. Row 1 / Column 4 → 1 (Full House)
61. Row 6 / Column 6 → 1 (Full House)
62. Row 1 / Column 6 → 9 (Full House)
63. Row 8 / Column 3 → 4 (Naked Single)
64. Row 6 / Column 3 → 7 (Full House)
65. Row 6 / Column 1 → 4 (Full House)
66. Row 8 / Column 1 → 9 (Full House)