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

This Sudoku Puzzle has 41 steps and it is solved using Full House, Naked Single, Hidden Single, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 8 → 9 (Full House)
2. Row 6 / Column 4 → 2 (Naked Single)
3. Row 4 / Column 4 → 6 (Full House)
4. Row 5 / Column 3 → 7 (Hidden Single)
5. Row 7 / Column 6 → 9 (Hidden Single)
6. Row 8 / Column 6 → 6 (Hidden Single)
7. Row 8 / Column 8 → 7 (Full House)
8. Row 5 / Column 8 → 6 (Hidden Single)
9. Row 5 / Column 7 → 4 (Naked Single)
10. Row 4 / Column 9 → 2 (Naked Single)
11. Row 5 / Column 9 → 2 (Naked Single)
12. Row 4 / Column 2 → 8 (Full House)
13. Row 5 / Column 2 → 8 (Full House)
14. Row 9 / Column 7 → 1 (Naked Single)
15. Row 4 / Column 6 → 3 (Naked Single)
16. Row 4 / Column 3 → 4 (Full House)
17. Row 6 / Column 6 → 8 (Full House)
18. Row 9 / Column 6 → 7 (Full House)
19. Row 5 / Column 1 → 3 (Naked Single)
20. Row 6 / Column 7 → 7 (Naked Single)
21. Row 9 / Column 9 → 4 (Naked Single)
22. Row 6 / Column 8 → 3 (Naked Single)
23. Row 6 / Column 9 → 1 (Full House)
24. Row 1 / Column 9 → 7 (Hidden Single)
25. Row 7 / Column 1 → 4 (Hidden Single)
26. Bivalue Universal Grave + 1 => r9c3<>2, r9c3<>3
27. Row 9 / Column 3 → 8 (Naked Single)
28. Row 3 / Column 3 → 9 (Naked Single)
29. Row 7 / Column 3 → 3 (Naked Single)
30. Row 9 / Column 1 → 2 (Full House)
31. Row 9 / Column 5 → 3 (Full House)
32. Row 1 / Column 3 → 2 (Full House)
33. Row 7 / Column 5 → 8 (Full House)
34. Row 3 / Column 5 → 5 (Naked Single)
35. Row 1 / Column 5 → 9 (Full House)
36. Row 1 / Column 1 → 6 (Naked Single)
37. Row 1 / Column 7 → 5 (Full House)
38. Row 3 / Column 1 → 8 (Full House)
39. Row 3 / Column 9 → 6 (Full House)
40. Row 7 / Column 7 → 6 (Full House)
41. Row 7 / Column 9 → 5 (Full House)