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

This Sudoku Puzzle has 56 steps and it is solved using Hidden Single, Naked Single, Full House, Naked Pair, Hidden Pair, Turbot Fish, Empty Rectangle, undefined, Skyscraper techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 4 → 1 (Hidden Single)
2. Row 2 / Column 4 → 9 (Naked Single)
3. Row 2 / Column 1 → 3 (Naked Single)
4. Row 3 / Column 4 → 6 (Naked Single)
5. Row 2 / Column 2 → 8 (Naked Single)
6. Row 1 / Column 5 → 7 (Naked Single)
7. Row 3 / Column 5 → 1 (Full House)
8. Row 4 / Column 4 → 2 (Naked Single)
9. Row 5 / Column 4 → 5 (Full House)
10. Row 2 / Column 8 → 5 (Naked Single)
11. Row 2 / Column 7 → 1 (Full House)
12. Row 4 / Column 2 → 7 (Hidden Single)
13. Row 3 / Column 8 → 8 (Hidden Single)
14. Row 6 / Column 9 → 5 (Hidden Single)
15. Row 4 / Column 7 → 3 (Hidden Single)
16. Row 1 / Column 9 → 3 (Hidden Single)
17. Row 4 / Column 8 → 4 (Hidden Single)
18. Naked Pair: 6,9 in r4c1,r6c2 => r5c12<>6, r5c123<>9
19. Hidden Pair: 1,3 in r58c3 => r58c3<>2, r8c3<>9
20. Turbot Fish: 6 r5c9 =6= r6c8 -6- r6c2 =6= r7c2 => r7c9<>6
21. Empty Rectangle: 9 in b9 (r6c28) => r7c2<>9
22. W-Wing: 6/2 in r7c2,r9c9 connected by 2 in r79c5 => r7c7,r9c1<>6
23. XY-Wing: 2/6/9 in r59c9,r8c8 => r6c8,r7c9<>9
24. Row 6 / Column 8 → 6 (Naked Single)
25. Row 5 / Column 9 → 9 (Full House)
26. Row 6 / Column 2 → 9 (Full House)
27. Row 5 / Column 5 → 6 (Naked Single)
28. Row 4 / Column 5 → 9 (Full House)
29. Row 4 / Column 1 → 6 (Full House)
30. Row 1 / Column 7 → 6 (Hidden Single)
31. Row 9 / Column 7 → 5 (Naked Single)
32. Row 9 / Column 9 → 6 (Hidden Single)
33. Row 7 / Column 2 → 6 (Hidden Single)
34. Row 1 / Column 1 → 4 (Hidden Single)
35. Row 7 / Column 1 → 5 (Hidden Single)
36. Skyscraper: 9 in r1c8,r7c7 (connected by r17c3) => r3c7,r8c8<>9
37. Row 3 / Column 7 → 4 (Naked Single)
38. Row 7 / Column 7 → 9 (Full House)
39. Row 8 / Column 8 → 2 (Naked Single)
40. Row 1 / Column 8 → 9 (Full House)
41. Row 3 / Column 9 → 2 (Full House)
42. Row 7 / Column 9 → 4 (Full House)
43. Row 1 / Column 3 → 2 (Full House)
44. Row 8 / Column 2 → 3 (Naked Single)
45. Row 5 / Column 2 → 2 (Full House)
46. Row 7 / Column 3 → 8 (Naked Single)
47. Row 7 / Column 5 → 2 (Full House)
48. Row 9 / Column 5 → 8 (Full House)
49. Row 8 / Column 3 → 1 (Naked Single)
50. Row 8 / Column 1 → 9 (Full House)
51. Row 5 / Column 1 → 1 (Naked Single)
52. Row 5 / Column 3 → 3 (Full House)
53. Row 9 / Column 3 → 7 (Naked Single)
54. Row 3 / Column 3 → 9 (Full House)
55. Row 3 / Column 1 → 7 (Full House)
56. Row 9 / Column 1 → 2 (Full House)