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

This Sudoku Puzzle has 54 steps and it is solved using Naked Single, Full House, Hidden Single, Naked Pair, Naked Triple, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 7 → 7 (Naked Single)
2. Row 7 / Column 8 → 3 (Naked Single)
3. Row 7 / Column 1 → 1 (Naked Single)
4. Row 7 / Column 6 → 4 (Naked Single)
5. Row 8 / Column 1 → 3 (Naked Single)
6. Row 8 / Column 3 → 6 (Full House)
7. Row 7 / Column 9 → 5 (Naked Single)
8. Row 7 / Column 5 → 6 (Full House)
9. Row 2 / Column 1 → 9 (Naked Single)
10. Row 9 / Column 9 → 8 (Naked Single)
11. Row 4 / Column 3 → 1 (Hidden Single)
12. Row 5 / Column 1 → 8 (Hidden Single)
13. Row 2 / Column 2 → 6 (Hidden Single)
14. Row 3 / Column 4 → 9 (Hidden Single)
15. Row 4 / Column 7 → 8 (Hidden Single)
16. Row 5 / Column 7 → 5 (Hidden Single)
17. Row 6 / Column 1 → 5 (Hidden Single)
18. Row 2 / Column 3 → 3 (Hidden Single)
19. Row 3 / Column 2 → 2 (Hidden Single)
20. Row 3 / Column 9 → 1 (Naked Single)
21. Row 2 / Column 9 → 2 (Full House)
22. Row 2 / Column 6 → 8 (Naked Single)
23. Row 8 / Column 6 → 2 (Naked Single)
24. Row 8 / Column 4 → 1 (Naked Single)
25. Row 2 / Column 4 → 5 (Naked Single)
26. Row 2 / Column 5 → 1 (Full House)
27. Row 8 / Column 5 → 8 (Naked Single)
28. Row 9 / Column 4 → 3 (Naked Single)
29. Row 9 / Column 5 → 5 (Full House)
30. Row 4 / Column 4 → 4 (Naked Single)
31. Row 1 / Column 4 → 2 (Full House)
32. Naked Pair: 3,7 in r4c5,r6c6 => r56c5<>3, r56c5<>7
33. Naked Triple: 2,7,9 in r5c358 => r5c9<>7
34. Bivalue Universal Grave + 1 => r1c5<>3, r1c5<>4
35. Row 1 / Column 5 → 7 (Naked Single)
36. Row 1 / Column 1 → 4 (Naked Single)
37. Row 1 / Column 6 → 3 (Full House)
38. Row 3 / Column 5 → 4 (Full House)
39. Row 3 / Column 1 → 7 (Full House)
40. Row 6 / Column 6 → 7 (Full House)
41. Row 4 / Column 5 → 3 (Naked Single)
42. Row 4 / Column 9 → 7 (Full House)
43. Row 6 / Column 3 → 2 (Naked Single)
44. Row 5 / Column 3 → 7 (Full House)
45. Row 5 / Column 8 → 9 (Naked Single)
46. Row 8 / Column 8 → 7 (Full House)
47. Row 8 / Column 9 → 4 (Naked Single)
48. Row 5 / Column 9 → 3 (Full House)
49. Row 6 / Column 7 → 4 (Full House)
50. Row 8 / Column 7 → 9 (Full House)
51. Row 6 / Column 5 → 9 (Naked Single)
52. Row 5 / Column 5 → 2 (Full House)
53. Row 5 / Column 2 → 4 (Full House)
54. Row 6 / Column 2 → 3 (Full House)
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