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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 4 / Column 7 → 8 (Naked Single)
2. Row 2 / Column 8 → 7 (Naked Single)
3. Row 5 / Column 7 → 9 (Naked Single)
4. Row 2 / Column 7 → 2 (Naked Single)
5. Row 5 / Column 9 → 1 (Naked Single)
6. Row 6 / Column 9 → 7 (Naked Single)
7. Row 4 / Column 8 → 3 (Full House)
8. Row 7 / Column 7 → 4 (Naked Single)
9. Row 4 / Column 3 → 2 (Naked Single)
10. Row 9 / Column 7 → 7 (Naked Single)
11. Row 8 / Column 7 → 6 (Full House)
12. Row 4 / Column 2 → 4 (Naked Single)
13. Row 3 / Column 8 → 6 (Hidden Single)
14. Row 3 / Column 3 → 7 (Hidden Single)
15. Row 5 / Column 5 → 6 (Hidden Single)
16. Row 6 / Column 2 → 6 (Hidden Single)
17. Row 1 / Column 5 → 7 (Hidden Single)
18. Row 8 / Column 1 → 4 (Hidden Single)
19. Row 8 / Column 6 → 7 (Hidden Single)
20. Row 1 / Column 4 → 6 (Hidden Single)
21. Row 5 / Column 6 → 4 (Hidden Single)
22. Row 3 / Column 6 → 5 (Naked Single)
23. Row 2 / Column 6 → 1 (Naked Single)
24. Row 2 / Column 5 → 9 (Naked Single)
25. Row 3 / Column 4 → 4 (Full House)
26. Row 2 / Column 2 → 3 (Naked Single)
27. Row 2 / Column 1 → 5 (Full House)
28. Row 6 / Column 1 → 9 (Hidden Single)
29. Row 1 / Column 1 → 8 (Naked Single)
30. Row 1 / Column 9 → 9 (Full House)
31. Row 3 / Column 9 → 8 (Full House)
32. Row 3 / Column 1 → 2 (Naked Single)
33. Row 3 / Column 2 → 9 (Full House)
34. Row 5 / Column 1 → 3 (Naked Single)
35. Row 5 / Column 3 → 8 (Full House)
36. Row 7 / Column 1 → 1 (Full House)
37. Row 7 / Column 8 → 8 (Naked Single)
38. Row 8 / Column 8 → 1 (Full House)
39. Row 9 / Column 5 → 4 (Hidden Single)
40. Row 9 / Column 4 → 1 (Hidden Single)
41. Row 4 / Column 4 → 5 (Naked Single)
42. Row 4 / Column 5 → 1 (Full House)
43. Naked Pair: 2,5 in r7c59 => r7c3<>5, r7c4<>2
44. Bivalue Universal Grave + 1 => r8c5<>5, r8c5<>8
45. Row 8 / Column 5 → 2 (Naked Single)
46. Row 6 / Column 5 → 8 (Naked Single)
47. Row 7 / Column 5 → 5 (Full House)
48. Row 8 / Column 2 → 8 (Naked Single)
49. Row 9 / Column 2 → 2 (Full House)
50. Row 8 / Column 4 → 9 (Naked Single)
51. Row 8 / Column 3 → 5 (Full House)
52. Row 6 / Column 6 → 3 (Naked Single)
53. Row 6 / Column 4 → 2 (Full House)
54. Row 7 / Column 4 → 3 (Full House)
55. Row 9 / Column 6 → 8 (Full House)
56. Row 7 / Column 9 → 2 (Naked Single)
57. Row 9 / Column 9 → 5 (Full House)
58. Row 9 / Column 3 → 3 (Full House)
59. Row 7 / Column 3 → 9 (Full House)
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