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

This Sudoku Puzzle has 45 steps and it is solved using Hidden Single, Naked Single, Full House, Skyscraper, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 2 → 3 (Hidden Single)
2. Row 4 / Column 2 → 5 (Hidden Single)
3. Row 4 / Column 6 → 8 (Naked Single)
4. Row 6 / Column 6 → 5 (Full House)
5. Row 2 / Column 2 → 8 (Hidden Single)
6. Row 2 / Column 7 → 9 (Naked Single)
7. Row 2 / Column 8 → 6 (Full House)
8. Row 8 / Column 8 → 2 (Naked Single)
9. Row 8 / Column 2 → 6 (Full House)
10. Row 6 / Column 8 → 8 (Hidden Single)
11. Row 7 / Column 9 → 6 (Hidden Single)
12. Row 5 / Column 3 → 8 (Hidden Single)
13. Row 1 / Column 3 → 6 (Hidden Single)
14. Row 1 / Column 2 → 2 (Hidden Single)
15. Row 9 / Column 2 → 1 (Full House)
16. Row 9 / Column 3 → 2 (Hidden Single)
17. Skyscraper: 9 in r6c3,r9c1 (connected by r69c9) => r45c1,r7c3<>9
18. Row 7 / Column 3 → 4 (Naked Single)
19. Row 3 / Column 3 → 1 (Naked Single)
20. Row 6 / Column 3 → 9 (Full House)
21. Row 6 / Column 9 → 1 (Full House)
22. Bivalue Universal Grave + 1 => r1c7<>1, r1c7<>5
23. Row 1 / Column 7 → 4 (Naked Single)
24. Row 1 / Column 1 → 7 (Naked Single)
25. Row 3 / Column 1 → 4 (Full House)
26. Row 1 / Column 8 → 1 (Naked Single)
27. Row 1 / Column 9 → 5 (Full House)
28. Row 3 / Column 7 → 8 (Naked Single)
29. Row 3 / Column 9 → 7 (Full House)
30. Row 4 / Column 7 → 2 (Naked Single)
31. Row 7 / Column 8 → 9 (Naked Single)
32. Row 4 / Column 8 → 4 (Full House)
33. Row 5 / Column 9 → 9 (Naked Single)
34. Row 5 / Column 7 → 5 (Full House)
35. Row 9 / Column 9 → 8 (Full House)
36. Row 9 / Column 7 → 3 (Naked Single)
37. Row 7 / Column 7 → 1 (Full House)
38. Row 7 / Column 1 → 3 (Full House)
39. Row 9 / Column 1 → 9 (Full House)
40. Row 4 / Column 5 → 6 (Naked Single)
41. Row 5 / Column 5 → 2 (Full House)
42. Row 5 / Column 4 → 1 (Naked Single)
43. Row 4 / Column 4 → 9 (Full House)
44. Row 4 / Column 1 → 1 (Full House)
45. Row 5 / Column 1 → 6 (Full House)