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

This Sudoku Puzzle has 61 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 2 (Claiming), Naked Pair, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 3 → 3 (Hidden Single)
2. Row 1 / Column 4 → 4 (Hidden Single)
3. Row 9 / Column 3 → 4 (Hidden Single)
4. Row 2 / Column 1 → 4 (Hidden Single)
5. Row 4 / Column 1 → 1 (Hidden Single)
6. Row 8 / Column 9 → 1 (Hidden Single)
7. Row 5 / Column 8 → 1 (Hidden Single)
8. Row 8 / Column 1 → 2 (Hidden Single)
9. Row 5 / Column 2 → 2 (Hidden Single)
10. Row 9 / Column 4 → 1 (Hidden Single)
11. Row 5 / Column 7 → 8 (Hidden Single)
12. Row 6 / Column 9 → 7 (Naked Single)
13. Row 8 / Column 7 → 7 (Naked Single)
14. Row 4 / Column 9 → 2 (Naked Single)
15. Row 2 / Column 9 → 8 (Full House)
16. Row 6 / Column 1 → 5 (Naked Single)
17. Row 1 / Column 1 → 7 (Full House)
18. Row 1 / Column 8 → 6 (Naked Single)
19. Row 2 / Column 7 → 2 (Naked Single)
20. Row 3 / Column 8 → 7 (Full House)
21. Row 4 / Column 8 → 3 (Naked Single)
22. Row 9 / Column 7 → 3 (Naked Single)
23. Row 6 / Column 8 → 4 (Naked Single)
24. Row 7 / Column 7 → 4 (Naked Single)
25. Row 4 / Column 3 → 7 (Hidden Single)
26. Row 1 / Column 6 → 8 (Hidden Single)
27. Row 6 / Column 5 → 3 (Hidden Single)
28. Row 7 / Column 6 → 3 (Hidden Single)
29. Row 6 / Column 7 → 9 (Hidden Single)
30. Row 4 / Column 7 → 6 (Full House)
31. Locked Candidates Type 2 (Claiming): 5 in c4 => r78c5,r9c6<>5
32. Naked Pair: 2,7 in r7c5,r9c6 => r7c4<>7
33. Row 7 / Column 4 → 5 (Naked Single)
34. Row 5 / Column 4 → 7 (Hidden Single)
35. Row 5 / Column 6 → 6 (Full House)
36. Naked Pair: 5,9 in r14c5 => r2c5<>5, r38c5<>9
37. Row 8 / Column 5 → 6 (Naked Single)
38. Row 8 / Column 4 → 9 (Naked Single)
39. Row 3 / Column 4 → 6 (Full House)
40. Bivalue Universal Grave + 1 => r2c2<>1, r2c2<>6
41. Row 2 / Column 2 → 5 (Naked Single)
42. Row 1 / Column 2 → 9 (Naked Single)
43. Row 1 / Column 5 → 5 (Full House)
44. Row 2 / Column 3 → 6 (Naked Single)
45. Row 3 / Column 2 → 1 (Full House)
46. Row 2 / Column 6 → 7 (Naked Single)
47. Row 2 / Column 5 → 1 (Full House)
48. Row 9 / Column 2 → 7 (Naked Single)
49. Row 4 / Column 5 → 9 (Naked Single)
50. Row 4 / Column 6 → 5 (Full House)
51. Row 6 / Column 3 → 8 (Naked Single)
52. Row 6 / Column 2 → 6 (Full House)
53. Row 7 / Column 2 → 8 (Full House)
54. Row 8 / Column 3 → 5 (Full House)
55. Row 8 / Column 8 → 8 (Full House)
56. Row 3 / Column 5 → 2 (Naked Single)
57. Row 3 / Column 6 → 9 (Full House)
58. Row 9 / Column 6 → 2 (Full House)
59. Row 7 / Column 5 → 7 (Full House)
60. Row 7 / Column 8 → 2 (Full House)
61. Row 9 / Column 8 → 5 (Full House)