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

This Sudoku Puzzle has 59 steps and it is solved using Hidden Single, Naked Single, Full House, undefined, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 6 → 5 (Hidden Single)
2. Row 2 / Column 5 → 7 (Hidden Single)
3. Row 1 / Column 5 → 8 (Naked Single)
4. Row 1 / Column 4 → 3 (Naked Single)
5. Row 3 / Column 5 → 4 (Full House)
6. Row 1 / Column 3 → 7 (Hidden Single)
7. Row 9 / Column 1 → 5 (Hidden Single)
8. Row 8 / Column 4 → 7 (Hidden Single)
9. Row 2 / Column 8 → 4 (Hidden Single)
10. Row 7 / Column 6 → 4 (Hidden Single)
11. Row 9 / Column 6 → 3 (Hidden Single)
12. Row 7 / Column 3 → 3 (Hidden Single)
13. Row 7 / Column 9 → 8 (Naked Single)
14. Row 7 / Column 8 → 6 (Naked Single)
15. Row 9 / Column 7 → 9 (Naked Single)
16. Row 9 / Column 4 → 6 (Naked Single)
17. Row 9 / Column 5 → 1 (Naked Single)
18. Row 9 / Column 3 → 8 (Full House)
19. Row 7 / Column 5 → 2 (Naked Single)
20. Row 7 / Column 2 → 1 (Full House)
21. Row 8 / Column 5 → 9 (Full House)
22. Row 5 / Column 5 → 6 (Full House)
23. Row 1 / Column 7 → 6 (Hidden Single)
24. Row 4 / Column 2 → 6 (Hidden Single)
25. Row 8 / Column 2 → 2 (Naked Single)
26. Row 8 / Column 1 → 6 (Full House)
27. Row 1 / Column 2 → 9 (Naked Single)
28. Row 1 / Column 8 → 1 (Naked Single)
29. Row 1 / Column 9 → 2 (Full House)
30. Row 2 / Column 9 → 3 (Naked Single)
31. Row 2 / Column 2 → 8 (Naked Single)
32. Row 2 / Column 1 → 2 (Full House)
33. Row 3 / Column 7 → 8 (Naked Single)
34. Row 3 / Column 8 → 9 (Full House)
35. Row 8 / Column 9 → 5 (Naked Single)
36. Row 5 / Column 9 → 1 (Full House)
37. Row 8 / Column 8 → 3 (Full House)
38. Row 3 / Column 1 → 1 (Naked Single)
39. Row 3 / Column 2 → 3 (Full House)
40. Row 5 / Column 1 → 8 (Full House)
41. Row 5 / Column 7 → 3 (Hidden Single)
42. W-Wing: 1/2 in r4c3,r6c6 connected by 2 in r5c36 => r4c6,r6c3<>1
43. Row 4 / Column 3 → 1 (Hidden Single)
44. Row 6 / Column 6 → 1 (Hidden Single)
45. Bivalue Universal Grave + 1 => r6c4<>8, r6c4<>9
46. Row 6 / Column 4 → 4 (Naked Single)
47. Row 4 / Column 4 → 8 (Naked Single)
48. Row 5 / Column 4 → 9 (Full House)
49. Row 6 / Column 2 → 5 (Naked Single)
50. Row 5 / Column 2 → 4 (Full House)
51. Row 6 / Column 7 → 2 (Naked Single)
52. Row 4 / Column 7 → 4 (Full House)
53. Row 4 / Column 8 → 7 (Naked Single)
54. Row 4 / Column 6 → 2 (Full House)
55. Row 5 / Column 6 → 7 (Full House)
56. Row 5 / Column 3 → 2 (Naked Single)
57. Row 6 / Column 3 → 9 (Full House)
58. Row 6 / Column 8 → 8 (Full House)
59. Row 5 / Column 8 → 5 (Full House)