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

This Sudoku Puzzle has 69 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Skyscraper, Full House, undefined techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 1 → 7 (Naked Single)
2. Row 8 / Column 1 → 2 (Naked Single)
3. Row 2 / Column 6 → 5 (Hidden Single)
4. Row 1 / Column 4 → 7 (Hidden Single)
5. Row 4 / Column 7 → 4 (Hidden Single)
6. Locked Candidates Type 1 (Pointing): 6 in b1 => r45c2<>6
7. Locked Candidates Type 1 (Pointing): 8 in b3 => r2c5<>8
8. Locked Candidates Type 1 (Pointing): 5 in b6 => r7c9<>5
9. Locked Candidates Type 1 (Pointing): 5 in b7 => r4c2<>5
10. Locked Candidates Type 2 (Claiming): 8 in c5 => r7c46,r89c6,r9c4<>8
11. Row 7 / Column 9 → 8 (Hidden Single)
12. Row 2 / Column 7 → 8 (Hidden Single)
13. Locked Candidates Type 1 (Pointing): 2 in b9 => r5c8<>2
14. Naked Triple: 1,6,9 in r8c689 => r8c57<>1, r8c57<>6, r8c57<>9
15. Row 8 / Column 7 → 7 (Naked Single)
16. Locked Candidates Type 2 (Claiming): 1 in c7 => r456c9,r5c8<>1
17. Naked Triple: 1,6,9 in r8c89,r9c7 => r7c8<>1, r9c8<>6, r9c8<>9
18. Locked Candidates Type 1 (Pointing): 1 in b9 => r8c6<>1
19. Skyscraper: 4 in r1c5,r7c4 (connected by r17c2) => r3c4,r8c5<>4
20. Row 8 / Column 5 → 8 (Naked Single)
21. Row 8 / Column 3 → 4 (Naked Single)
22. Row 7 / Column 2 → 5 (Naked Single)
23. Row 7 / Column 8 → 2 (Naked Single)
24. Row 9 / Column 2 → 7 (Naked Single)
25. Row 9 / Column 3 → 8 (Full House)
26. Row 7 / Column 6 → 1 (Naked Single)
27. Row 7 / Column 4 → 4 (Full House)
28. Row 9 / Column 8 → 5 (Naked Single)
29. Row 1 / Column 5 → 4 (Hidden Single)
30. Row 3 / Column 2 → 4 (Hidden Single)
31. Row 9 / Column 6 → 2 (Hidden Single)
32. Row 5 / Column 3 → 7 (Hidden Single)
33. Row 3 / Column 8 → 6 (Hidden Single)
34. Row 1 / Column 2 → 6 (Hidden Single)
35. Row 5 / Column 9 → 2 (Hidden Single)
36. Row 4 / Column 3 → 2 (Hidden Single)
37. Row 6 / Column 3 → 3 (Hidden Single)
38. Locked Candidates Type 2 (Claiming): 1 in r1 => r2c9<>1
39. X-Wing: 3 c68 r15 => r1c9,r5c4<>3
40. Skyscraper: 6 in r5c7,r8c9 (connected by r58c6) => r46c9,r9c7<>6
41. Row 9 / Column 7 → 9 (Naked Single)
42. Row 8 / Column 8 → 1 (Naked Single)
43. Row 8 / Column 9 → 6 (Full House)
44. Row 8 / Column 6 → 9 (Full House)
45. Row 9 / Column 4 → 3 (Naked Single)
46. Row 9 / Column 5 → 6 (Full House)
47. Row 1 / Column 6 → 3 (Naked Single)
48. Row 3 / Column 6 → 8 (Naked Single)
49. Row 5 / Column 6 → 6 (Full House)
50. Row 1 / Column 8 → 9 (Naked Single)
51. Row 1 / Column 9 → 1 (Full House)
52. Row 2 / Column 9 → 3 (Full House)
53. Row 5 / Column 8 → 3 (Full House)
54. Row 5 / Column 7 → 1 (Naked Single)
55. Row 6 / Column 7 → 6 (Full House)
56. Row 5 / Column 2 → 9 (Naked Single)
57. Row 4 / Column 2 → 1 (Full House)
58. Row 5 / Column 4 → 8 (Full House)
59. Row 6 / Column 1 → 5 (Naked Single)
60. Row 4 / Column 1 → 6 (Full House)
61. Row 4 / Column 4 → 9 (Naked Single)
62. Row 3 / Column 4 → 1 (Full House)
63. Row 2 / Column 5 → 9 (Full House)
64. Row 3 / Column 3 → 9 (Full House)
65. Row 2 / Column 3 → 1 (Full House)
66. Row 6 / Column 9 → 9 (Naked Single)
67. Row 4 / Column 9 → 5 (Full House)
68. Row 4 / Column 5 → 3 (Full House)
69. Row 6 / Column 5 → 1 (Full House)