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

This Sudoku Puzzle has 59 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Full House, undefined, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 4 / Column 8 → 8 (Hidden Single)
2. Row 1 / Column 4 → 6 (Hidden Single)
3. Row 5 / Column 5 → 7 (Hidden Single)
4. Row 8 / Column 7 → 3 (Hidden Single)
5. Row 4 / Column 6 → 5 (Hidden Single)
6. Row 9 / Column 9 → 7 (Hidden Single)
7. Row 4 / Column 3 → 7 (Hidden Single)
8. Row 3 / Column 1 → 7 (Hidden Single)
9. Row 6 / Column 8 → 7 (Hidden Single)
10. Row 8 / Column 5 → 5 (Hidden Single)
11. Row 7 / Column 7 → 5 (Hidden Single)
12. Row 7 / Column 9 → 8 (Hidden Single)
13. Locked Candidates Type 1 (Pointing): 1 in b2 => r9c5<>1
14. Locked Candidates Type 1 (Pointing): 4 in b5 => r89c4<>4
15. Row 8 / Column 8 → 4 (Hidden Single)
16. Row 5 / Column 8 → 9 (Naked Single)
17. Row 2 / Column 8 → 1 (Full House)
18. Row 5 / Column 9 → 2 (Naked Single)
19. Row 1 / Column 9 → 9 (Naked Single)
20. Row 3 / Column 7 → 2 (Full House)
21. Row 8 / Column 9 → 1 (Full House)
22. Row 9 / Column 7 → 9 (Full House)
23. Row 9 / Column 4 → 1 (Hidden Single)
24. Locked Candidates Type 1 (Pointing): 1 in b1 => r6c3<>1
25. X-Wing: 2 r48 c24 => r26c2,r6c4<>2
26. X-Wing: 9 r37 c35 => r2c35<>9
27. Row 2 / Column 5 → 2 (Naked Single)
28. W-Wing: 4/9 in r6c4,r7c3 connected by 9 in r8c24 => r6c3<>4
29. Locked Candidates Type 1 (Pointing): 4 in b4 => r5c7<>4
30. Row 5 / Column 7 → 6 (Naked Single)
31. Row 5 / Column 2 → 5 (Naked Single)
32. Row 2 / Column 1 → 5 (Hidden Single)
33. Bivalue Universal Grave + 1 => r1c3<>1, r1c3<>2
34. Row 1 / Column 3 → 3 (Naked Single)
35. Row 1 / Column 1 → 2 (Naked Single)
36. Row 1 / Column 6 → 8 (Naked Single)
37. Row 1 / Column 5 → 1 (Full House)
38. Row 2 / Column 3 → 6 (Naked Single)
39. Row 5 / Column 3 → 4 (Naked Single)
40. Row 5 / Column 1 → 3 (Full House)
41. Row 9 / Column 1 → 4 (Full House)
42. Row 9 / Column 6 → 2 (Naked Single)
43. Row 9 / Column 5 → 8 (Full House)
44. Row 3 / Column 5 → 9 (Naked Single)
45. Row 2 / Column 6 → 3 (Full House)
46. Row 2 / Column 2 → 9 (Full House)
47. Row 6 / Column 6 → 9 (Full House)
48. Row 3 / Column 3 → 1 (Full House)
49. Row 7 / Column 5 → 4 (Full House)
50. Row 7 / Column 3 → 9 (Full House)
51. Row 6 / Column 3 → 2 (Full House)
52. Row 8 / Column 4 → 9 (Full House)
53. Row 8 / Column 2 → 2 (Full House)
54. Row 6 / Column 4 → 4 (Naked Single)
55. Row 4 / Column 4 → 2 (Full House)
56. Row 4 / Column 2 → 1 (Naked Single)
57. Row 4 / Column 7 → 4 (Full House)
58. Row 6 / Column 7 → 1 (Full House)
59. Row 6 / Column 2 → 6 (Full House)