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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 3 → 2 (Hidden Single)
2. Row 7 / Column 8 → 2 (Hidden Single)
3. Row 3 / Column 2 → 2 (Hidden Single)
4. Row 8 / Column 4 → 8 (Hidden Single)
5. Row 2 / Column 5 → 2 (Hidden Single)
6. Row 4 / Column 3 → 9 (Hidden Single)
7. Row 9 / Column 8 → 9 (Hidden Single)
8. Locked Pair: 4,7 in r5c46 => r46c5,r5c28,r6c6<>7, r5c8,r6c6<>4
9. Locked Candidates Type 1 (Pointing): 3 in b1 => r2c79<>3
10. Locked Candidates Type 1 (Pointing): 6 in b1 => r1c46<>6
11. Locked Candidates Type 1 (Pointing): 1 in b2 => r79c6<>1
12. Row 9 / Column 2 → 1 (Hidden Single)
13. Row 4 / Column 2 → 7 (Naked Single)
14. Row 5 / Column 2 → 3 (Naked Single)
15. Row 5 / Column 8 → 1 (Naked Single)
16. Row 6 / Column 1 → 4 (Naked Single)
17. Row 4 / Column 1 → 1 (Full House)
18. Row 7 / Column 2 → 5 (Naked Single)
19. Row 1 / Column 2 → 6 (Full House)
20. Row 4 / Column 7 → 5 (Naked Single)
21. Row 4 / Column 5 → 6 (Naked Single)
22. Row 8 / Column 5 → 5 (Hidden Single)
23. Row 3 / Column 5 → 7 (Naked Single)
24. Row 6 / Column 5 → 9 (Naked Single)
25. Row 7 / Column 5 → 1 (Full House)
26. Row 6 / Column 6 → 5 (Naked Single)
27. Row 6 / Column 9 → 6 (Hidden Single)
28. Row 8 / Column 3 → 6 (Hidden Single)
29. Row 7 / Column 3 → 4 (Hidden Single)
30. Naked Triple: 5,7,8 in r1c138 => r1c4<>5, r1c6<>8, r1c7<>7
31. W-Wing: 7/3 in r6c8,r7c9 connected by 3 in r3c89 => r8c8<>7
32. XY-Chain: 9 9- r2c4 -5- r3c4 -6- r3c6 -8- r3c9 -3- r7c9 -7- r7c6 -9 => r12c6,r7c4<>9
33. Row 7 / Column 6 → 9 (Hidden Single)
34. XY-Chain: 7 7- r7c9 -3- r3c9 -8- r3c6 -6- r9c6 -7- r9c3 -3- r8c1 -7 => r8c79<>7
35. Row 8 / Column 1 → 7 (Hidden Single)
36. Row 9 / Column 3 → 3 (Full House)
37. Row 1 / Column 1 → 5 (Naked Single)
38. Row 2 / Column 1 → 3 (Full House)
39. Row 7 / Column 9 → 7 (Hidden Single)
40. Row 7 / Column 4 → 3 (Full House)
41. Row 3 / Column 8 → 5 (Hidden Single)
42. Row 3 / Column 4 → 6 (Naked Single)
43. Row 3 / Column 6 → 8 (Naked Single)
44. Row 3 / Column 9 → 3 (Full House)
45. Row 9 / Column 4 → 7 (Naked Single)
46. Row 9 / Column 6 → 6 (Full House)
47. Row 2 / Column 6 → 1 (Naked Single)
48. Row 5 / Column 4 → 4 (Naked Single)
49. Row 5 / Column 6 → 7 (Full House)
50. Row 1 / Column 6 → 4 (Full House)
51. Row 2 / Column 9 → 8 (Naked Single)
52. Row 1 / Column 4 → 9 (Naked Single)
53. Row 2 / Column 4 → 5 (Full House)
54. Row 1 / Column 8 → 7 (Naked Single)
55. Row 2 / Column 3 → 7 (Naked Single)
56. Row 1 / Column 3 → 8 (Full House)
57. Row 1 / Column 7 → 1 (Full House)
58. Row 2 / Column 7 → 9 (Full House)
59. Row 4 / Column 9 → 4 (Naked Single)
60. Row 4 / Column 8 → 8 (Full House)
61. Row 8 / Column 9 → 1 (Full House)
62. Row 6 / Column 8 → 3 (Naked Single)
63. Row 6 / Column 7 → 7 (Full House)
64. Row 8 / Column 7 → 3 (Full House)
65. Row 8 / Column 8 → 4 (Full House)