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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Empty Rectangle, undefined, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 6 → 5 (Hidden Single)
2. Row 8 / Column 6 → 2 (Naked Single)
3. Row 7 / Column 5 → 6 (Naked Single)
4. Row 8 / Column 8 → 8 (Naked Single)
5. Row 9 / Column 5 → 4 (Naked Single)
6. Row 9 / Column 6 → 3 (Naked Single)
7. Row 8 / Column 4 → 5 (Full House)
8. Row 3 / Column 5 → 7 (Hidden Single)
9. Row 1 / Column 7 → 6 (Hidden Single)
10. Row 6 / Column 4 → 4 (Hidden Single)
11. Row 3 / Column 3 → 1 (Hidden Single)
12. Row 1 / Column 5 → 1 (Hidden Single)
13. Row 6 / Column 6 → 9 (Hidden Single)
14. Row 2 / Column 6 → 6 (Naked Single)
15. Row 4 / Column 6 → 1 (Full House)
16. Row 4 / Column 4 → 6 (Hidden Single)
17. Locked Candidates Type 1 (Pointing): 3 in b3 => r46c9<>3
18. Locked Candidates Type 1 (Pointing): 8 in b3 => r3c1<>8
19. Locked Candidates Type 1 (Pointing): 7 in b9 => r7c13<>7
20. Row 2 / Column 1 → 7 (Hidden Single)
21. Row 2 / Column 2 → 8 (Hidden Single)
22. Row 9 / Column 1 → 8 (Hidden Single)
23. Row 9 / Column 3 → 6 (Hidden Single)
24. Row 5 / Column 1 → 6 (Hidden Single)
25. Row 6 / Column 8 → 6 (Hidden Single)
26. Row 1 / Column 1 → 4 (Hidden Single)
27. Row 4 / Column 8 → 3 (Hidden Single)
28. Locked Candidates Type 1 (Pointing): 9 in b1 => r1c9<>9
29. Empty Rectangle: 2 in b7 (r4c29) => r7c9<>2
30. XY-Wing: 2/7/4 in r48c2,r5c3 => r5c2,r8c3<>4
31. Row 8 / Column 3 → 7 (Naked Single)
32. Row 8 / Column 2 → 4 (Full House)
33. Row 5 / Column 3 → 4 (Hidden Single)
34. W-Wing: 2/3 in r1c9,r6c3 connected by 3 in r16c2 => r1c3,r6c9<>2
35. X-Wing: 2 r14 c29 => r359c9,r569c2<>2
36. Row 5 / Column 2 → 1 (Naked Single)
37. Row 9 / Column 2 → 9 (Naked Single)
38. Row 9 / Column 8 → 1 (Hidden Single)
39. Row 9 / Column 9 → 5 (Naked Single)
40. Row 9 / Column 7 → 2 (Full House)
41. Row 6 / Column 9 → 1 (Hidden Single)
42. Row 1 / Column 3 → 9 (Hidden Single)
43. Row 5 / Column 7 → 5 (Hidden Single)
44. Bivalue Universal Grave + 1 => r3c9<>3, r3c9<>8
45. Row 3 / Column 9 → 9 (Naked Single)
46. Row 2 / Column 8 → 2 (Naked Single)
47. Row 2 / Column 4 → 9 (Full House)
48. Row 3 / Column 4 → 2 (Full House)
49. Row 5 / Column 8 → 9 (Full House)
50. Row 3 / Column 7 → 8 (Naked Single)
51. Row 1 / Column 9 → 3 (Full House)
52. Row 3 / Column 1 → 3 (Full House)
53. Row 1 / Column 2 → 2 (Full House)
54. Row 7 / Column 1 → 2 (Full House)
55. Row 7 / Column 3 → 3 (Full House)
56. Row 6 / Column 3 → 2 (Full House)
57. Row 5 / Column 9 → 8 (Naked Single)
58. Row 5 / Column 5 → 2 (Full House)
59. Row 6 / Column 5 → 8 (Full House)
60. Row 7 / Column 9 → 7 (Naked Single)
61. Row 4 / Column 9 → 2 (Full House)
62. Row 6 / Column 7 → 7 (Full House)
63. Row 4 / Column 2 → 7 (Full House)
64. Row 7 / Column 7 → 9 (Full House)
65. Row 6 / Column 2 → 3 (Full House)