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

This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, undefined, Skyscraper, Naked Pair, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 4 → 1 (Naked Single)
2. Row 3 / Column 4 → 6 (Hidden Single)
3. Row 8 / Column 3 → 3 (Hidden Single)
4. Row 9 / Column 9 → 3 (Hidden Single)
5. Row 7 / Column 5 → 4 (Hidden Single)
6. Row 6 / Column 3 → 9 (Hidden Single)
7. Row 2 / Column 4 → 4 (Hidden Single)
8. Row 6 / Column 6 → 3 (Hidden Single)
9. Row 5 / Column 1 → 3 (Hidden Single)
10. Row 3 / Column 1 → 4 (Hidden Single)
11. Row 1 / Column 8 → 4 (Hidden Single)
12. Row 8 / Column 4 → 9 (Hidden Single)
13. Row 2 / Column 5 → 3 (Hidden Single)
14. Row 1 / Column 1 → 9 (Hidden Single)
15. Row 2 / Column 6 → 9 (Hidden Single)
16. Locked Candidates Type 1 (Pointing): 2 in b8 => r5c5<>2
17. Locked Candidates Type 2 (Claiming): 7 in c4 => r4c6,r5c5<>7
18. Naked Triple: 1,7,8 in r3c235 => r3c79<>7, r3c7<>8
19. X-Wing: 8 r26 c28 => r345c2,r45c8<>8
20. Skyscraper: 8 in r4c6,r5c7 (connected by r1c67) => r5c5<>8
21. Row 5 / Column 5 → 5 (Naked Single)
22. Row 4 / Column 6 → 8 (Naked Single)
23. Row 7 / Column 1 → 8 (Hidden Single)
24. Locked Candidates Type 2 (Claiming): 5 in r7 => r8c8,r9c7<>5
25. Locked Candidates Type 2 (Claiming): 5 in c8 => r4c9<>5
26. X-Wing: 2 r17 c39 => r2c9,r59c3<>2
27. Row 2 / Column 9 → 7 (Naked Single)
28. Naked Pair: 6,7 in r9c37 => r9c56<>7
29. Locked Candidates Type 1 (Pointing): 7 in b8 => r8c28<>7
30. Row 3 / Column 2 → 7 (Hidden Single)
31. Locked Candidates Type 1 (Pointing): 1 in b1 => r5c3<>1
32. Locked Candidates Type 1 (Pointing): 7 in b9 => r5c7<>7
33. 2-String Kite: 6 in r5c3,r8c8 (connected by r8c2,r9c3) => r5c8<>6
34. Row 5 / Column 8 → 7 (Naked Single)
35. Row 5 / Column 4 → 2 (Naked Single)
36. Row 4 / Column 4 → 7 (Full House)
37. W-Wing: 8/6 in r1c7,r5c3 connected by 6 in r9c37 => r1c3,r5c7<>8
38. Row 5 / Column 3 → 8 (Hidden Single)
39. Row 3 / Column 3 → 1 (Naked Single)
40. Row 6 / Column 2 → 5 (Naked Single)
41. Row 6 / Column 8 → 8 (Full House)
42. Row 1 / Column 3 → 2 (Naked Single)
43. Row 2 / Column 2 → 8 (Full House)
44. Row 2 / Column 8 → 2 (Full House)
45. Row 3 / Column 5 → 8 (Naked Single)
46. Row 4 / Column 1 → 2 (Naked Single)
47. Row 9 / Column 1 → 5 (Full House)
48. Row 1 / Column 9 → 6 (Naked Single)
49. Row 7 / Column 3 → 7 (Naked Single)
50. Row 9 / Column 3 → 6 (Full House)
51. Row 8 / Column 2 → 2 (Full House)
52. Row 8 / Column 8 → 6 (Naked Single)
53. Row 4 / Column 8 → 5 (Full House)
54. Row 9 / Column 6 → 1 (Naked Single)
55. Row 1 / Column 7 → 8 (Naked Single)
56. Row 4 / Column 9 → 1 (Naked Single)
57. Row 4 / Column 2 → 6 (Full House)
58. Row 5 / Column 2 → 1 (Full House)
59. Row 7 / Column 7 → 5 (Naked Single)
60. Row 7 / Column 9 → 2 (Full House)
61. Row 9 / Column 7 → 7 (Full House)
62. Row 9 / Column 5 → 2 (Full House)
63. Row 8 / Column 5 → 7 (Naked Single)
64. Row 1 / Column 5 → 1 (Full House)
65. Row 1 / Column 6 → 7 (Full House)
66. Row 8 / Column 6 → 5 (Full House)
67. Row 5 / Column 9 → 9 (Naked Single)
68. Row 3 / Column 9 → 5 (Full House)
69. Row 3 / Column 7 → 9 (Full House)
70. Row 5 / Column 7 → 6 (Full House)