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

This Sudoku Puzzle has 56 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 2 (Claiming), Skyscraper, undefined techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 8 → 1 (Naked Single)
2. Row 4 / Column 6 → 7 (Hidden Single)
3. Row 2 / Column 5 → 4 (Hidden Single)
4. Row 3 / Column 6 → 3 (Hidden Single)
5. Row 1 / Column 6 → 5 (Naked Single)
6. Row 1 / Column 8 → 9 (Naked Single)
7. Row 2 / Column 6 → 6 (Naked Single)
8. Row 5 / Column 6 → 2 (Full House)
9. Row 1 / Column 3 → 3 (Hidden Single)
10. Row 9 / Column 7 → 8 (Hidden Single)
11. Row 1 / Column 4 → 7 (Hidden Single)
12. Row 3 / Column 4 → 8 (Naked Single)
13. Row 1 / Column 5 → 1 (Full House)
14. Row 1 / Column 2 → 8 (Full House)
15. Row 3 / Column 9 → 4 (Naked Single)
16. Row 3 / Column 7 → 7 (Naked Single)
17. Row 8 / Column 9 → 1 (Naked Single)
18. Row 2 / Column 7 → 5 (Naked Single)
19. Row 2 / Column 9 → 8 (Full House)
20. Row 5 / Column 7 → 1 (Naked Single)
21. Row 7 / Column 8 → 2 (Hidden Single)
22. Row 8 / Column 7 → 4 (Naked Single)
23. Row 9 / Column 2 → 4 (Hidden Single)
24. Row 6 / Column 1 → 8 (Hidden Single)
25. Row 5 / Column 5 → 8 (Hidden Single)
26. Row 2 / Column 1 → 7 (Hidden Single)
27. Row 5 / Column 3 → 4 (Hidden Single)
28. Locked Candidates Type 2 (Claiming): 6 in c3 => r4c12,r5c2<>6
29. Skyscraper: 5 in r5c2,r9c1 (connected by r59c8) => r4c1,r7c2<>5
30. XY-Chain: 1 1- r2c2 -9- r5c2 -5- r5c8 -6- r9c8 -5- r9c1 -6- r7c2 -1 => r4c2<>1
31. XY-Chain: 9 9- r5c2 -5- r5c8 -6- r9c8 -5- r9c1 -6- r3c1 -2- r8c1 -9 => r4c1<>9
32. Row 8 / Column 1 → 9 (Hidden Single)
33. Row 8 / Column 3 → 2 (Full House)
34. Row 6 / Column 7 → 2 (Hidden Single)
35. Row 4 / Column 7 → 3 (Full House)
36. Row 4 / Column 5 → 5 (Naked Single)
37. Row 6 / Column 5 → 3 (Full House)
38. Row 5 / Column 2 → 5 (Hidden Single)
39. Row 5 / Column 8 → 6 (Naked Single)
40. Row 5 / Column 4 → 9 (Full House)
41. Row 9 / Column 8 → 5 (Full House)
42. Row 6 / Column 4 → 6 (Full House)
43. Row 7 / Column 9 → 6 (Full House)
44. Row 9 / Column 1 → 6 (Full House)
45. Row 4 / Column 9 → 9 (Naked Single)
46. Row 6 / Column 9 → 5 (Full House)
47. Row 6 / Column 3 → 9 (Full House)
48. Row 7 / Column 2 → 1 (Naked Single)
49. Row 7 / Column 1 → 5 (Full House)
50. Row 3 / Column 1 → 2 (Naked Single)
51. Row 3 / Column 2 → 6 (Full House)
52. Row 4 / Column 1 → 1 (Full House)
53. Row 4 / Column 2 → 2 (Naked Single)
54. Row 2 / Column 2 → 9 (Full House)
55. Row 2 / Column 3 → 1 (Full House)
56. Row 4 / Column 3 → 6 (Full House)