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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Single, Hidden Rectangle, undefined, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 7 → 9 (Hidden Single)
2. Row 9 / Column 5 → 8 (Hidden Single)
3. Row 4 / Column 1 → 8 (Hidden Single)
4. Row 5 / Column 6 → 5 (Hidden Single)
5. Row 3 / Column 6 → 4 (Hidden Single)
6. Row 5 / Column 4 → 4 (Hidden Single)
7. Row 9 / Column 6 → 7 (Hidden Single)
8. Row 2 / Column 5 → 9 (Hidden Single)
9. Row 8 / Column 5 → 1 (Hidden Single)
10. Locked Candidates Type 1 (Pointing): 2 in b3 => r45c8<>2
11. Naked Pair: 3,6 in r7c14 => r7c28<>3, r7c2678<>6
12. Row 7 / Column 6 → 9 (Naked Single)
13. Row 7 / Column 2 → 1 (Naked Single)
14. Row 9 / Column 8 → 9 (Hidden Single)
15. Row 8 / Column 3 → 9 (Hidden Single)
16. Row 3 / Column 2 → 9 (Hidden Single)
17. Row 5 / Column 8 → 3 (Hidden Single)
18. Row 5 / Column 2 → 6 (Naked Single)
19. Row 1 / Column 2 → 5 (Naked Single)
20. Row 3 / Column 4 → 7 (Hidden Single)
21. Row 2 / Column 1 → 7 (Hidden Single)
22. Row 3 / Column 8 → 2 (Hidden Single)
23. Row 2 / Column 3 → 3 (Hidden Single)
24. Locked Candidates Type 1 (Pointing): 6 in b1 => r9c3<>6
25. Locked Candidates Type 1 (Pointing): 4 in b7 => r9c79<>4
26. Hidden Rectangle: 4/6 in r2c79,r8c79 => r2c9<>6
27. XY-Chain: 6 6- r7c1 -3- r6c1 -2- r5c3 -1- r5c9 -8- r3c9 -6- r3c3 -8- r1c3 -6- r1c6 -2- r8c6 -6 => r7c4,r8c1<>6
28. Row 7 / Column 4 → 3 (Naked Single)
29. Row 7 / Column 1 → 6 (Naked Single)
30. XY-Chain: 2 2- r1c6 -6- r1c3 -8- r3c3 -6- r3c9 -8- r5c9 -1- r5c3 -2- r6c1 -3- r8c1 -2- r8c6 -6- r9c4 -2 => r1c4,r8c6<>2
31. Row 8 / Column 6 → 6 (Naked Single)
32. Row 1 / Column 6 → 2 (Full House)
33. Row 9 / Column 4 → 2 (Full House)
34. Row 8 / Column 7 → 4 (Naked Single)
35. Row 9 / Column 3 → 4 (Naked Single)
36. Row 8 / Column 9 → 3 (Naked Single)
37. Row 8 / Column 1 → 2 (Full House)
38. Row 9 / Column 2 → 3 (Full House)
39. Row 6 / Column 1 → 3 (Full House)
40. Row 6 / Column 2 → 7 (Naked Single)
41. Row 4 / Column 2 → 4 (Full House)
42. Row 2 / Column 9 → 4 (Hidden Single)
43. Row 4 / Column 9 → 7 (Hidden Single)
44. Row 6 / Column 9 → 5 (Hidden Single)
45. Row 6 / Column 3 → 2 (Naked Single)
46. Row 6 / Column 5 → 6 (Full House)
47. Row 4 / Column 5 → 2 (Full House)
48. Row 5 / Column 3 → 1 (Naked Single)
49. Row 4 / Column 3 → 5 (Full House)
50. Row 5 / Column 9 → 8 (Naked Single)
51. Row 5 / Column 7 → 2 (Full House)
52. Row 3 / Column 9 → 6 (Naked Single)
53. Row 3 / Column 3 → 8 (Full House)
54. Row 9 / Column 9 → 1 (Full House)
55. Row 1 / Column 3 → 6 (Full House)
56. Row 9 / Column 7 → 6 (Full House)
57. Row 1 / Column 4 → 1 (Naked Single)
58. Row 1 / Column 8 → 8 (Full House)
59. Row 2 / Column 4 → 6 (Full House)
60. Row 4 / Column 7 → 1 (Naked Single)
61. Row 4 / Column 8 → 6 (Full House)
62. Row 7 / Column 8 → 5 (Naked Single)
63. Row 2 / Column 8 → 1 (Full House)
64. Row 2 / Column 7 → 5 (Full House)
65. Row 7 / Column 7 → 8 (Full House)