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

This Sudoku Puzzle has 60 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), undefined, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

Solution Steps:

1. Row 1 / Column 2 → 3 (Hidden Single)
2. Row 1 / Column 6 → 6 (Hidden Single)
3. Row 7 / Column 9 → 6 (Hidden Single)
4. Row 5 / Column 9 → 4 (Naked Single)
5. Row 1 / Column 9 → 7 (Naked Single)
6. Row 3 / Column 9 → 1 (Naked Single)
7. Row 9 / Column 9 → 2 (Full House)
8. Row 7 / Column 5 → 2 (Hidden Single)
9. Row 2 / Column 6 → 2 (Hidden Single)
10. Row 1 / Column 1 → 2 (Hidden Single)
11. Row 4 / Column 2 → 2 (Hidden Single)
12. Row 2 / Column 4 → 5 (Hidden Single)
13. Row 4 / Column 6 → 9 (Hidden Single)
14. Row 4 / Column 7 → 7 (Naked Single)
15. Row 4 / Column 8 → 6 (Naked Single)
16. Row 4 / Column 4 → 4 (Naked Single)
17. Row 4 / Column 1 → 1 (Full House)
18. Row 6 / Column 8 → 3 (Naked Single)
19. Row 5 / Column 7 → 9 (Full House)
20. Row 6 / Column 6 → 1 (Naked Single)
21. Row 8 / Column 4 → 7 (Naked Single)
22. Row 6 / Column 4 → 6 (Naked Single)
23. Row 7 / Column 4 → 3 (Full House)
24. Row 3 / Column 7 → 5 (Naked Single)
25. Row 6 / Column 5 → 8 (Naked Single)
26. Row 5 / Column 5 → 3 (Full House)
27. Row 6 / Column 2 → 7 (Naked Single)
28. Row 6 / Column 1 → 4 (Full House)
29. Row 9 / Column 5 → 1 (Hidden Single)
30. Row 9 / Column 8 → 7 (Hidden Single)
31. Row 9 / Column 7 → 3 (Hidden Single)
32. Row 1 / Column 3 → 5 (Hidden Single)
33. Locked Candidates Type 1 (Pointing): 8 in b1 => r2c8<>8
34. Locked Candidates Type 1 (Pointing): 8 in b9 => r8c2<>8
35. W-Wing: 9/7 in r3c5,r7c1 connected by 7 in r2c15 => r3c1<>9
36. Row 3 / Column 5 → 9 (Hidden Single)
37. Row 1 / Column 5 → 4 (Naked Single)
38. Row 2 / Column 5 → 7 (Full House)
39. Row 1 / Column 7 → 8 (Naked Single)
40. Row 1 / Column 8 → 9 (Full House)
41. Row 2 / Column 8 → 4 (Full House)
42. Row 8 / Column 8 → 8 (Full House)
43. Bivalue Universal Grave + 1 => r5c1<>5, r5c1<>6
44. Row 5 / Column 1 → 8 (Naked Single)
45. Row 2 / Column 1 → 9 (Naked Single)
46. Row 2 / Column 2 → 8 (Full House)
47. Row 5 / Column 2 → 5 (Naked Single)
48. Row 5 / Column 3 → 6 (Full House)
49. Row 9 / Column 1 → 5 (Naked Single)
50. Row 7 / Column 1 → 7 (Naked Single)
51. Row 3 / Column 1 → 6 (Full House)
52. Row 3 / Column 3 → 7 (Full House)
53. Row 8 / Column 2 → 1 (Naked Single)
54. Row 7 / Column 2 → 9 (Full House)
55. Row 9 / Column 6 → 4 (Naked Single)
56. Row 8 / Column 6 → 5 (Full House)
57. Row 8 / Column 7 → 4 (Full House)
58. Row 9 / Column 3 → 8 (Full House)
59. Row 7 / Column 3 → 4 (Full House)
60. Row 7 / Column 7 → 1 (Full House)