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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Hidden Pair, undefined, Naked Pair, Empty Rectangle, Naked Single, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 1 → 1 (Hidden Single)
2. Row 8 / Column 5 → 9 (Hidden Single)
3. Row 8 / Column 7 → 1 (Hidden Single)
4. Row 1 / Column 5 → 1 (Hidden Single)
5. Row 8 / Column 9 → 6 (Hidden Single)
6. Locked Candidates Type 1 (Pointing): 5 in b3 => r45c8<>5
7. Locked Candidates Type 1 (Pointing): 4 in b9 => r13c8<>4
8. Locked Candidates Type 2 (Claiming): 5 in r5 => r4c45,r6c5<>5
9. Row 3 / Column 5 → 5 (Hidden Single)
10. Row 1 / Column 8 → 5 (Hidden Single)
11. Locked Candidates Type 2 (Claiming): 2 in c3 => r46c1<>2
12. Naked Triple: 4,7,8 in r13c6,r2c5 => r123c4<>4, r123c4<>8, r23c4<>7
13. Naked Triple: 4,7,8 in r4c45,r6c5 => r5c46<>7
14. Hidden Pair: 2,3 in r7c12 => r7c12<>4, r7c1<>5, r7c2<>8, r7c2<>9
15. Row 9 / Column 2 → 9 (Hidden Single)
16. Locked Candidates Type 1 (Pointing): 5 in b7 => r8c4<>5
17. 2-String Kite: 7 in r2c3,r9c6 (connected by r2c5,r3c6) => r9c3<>7
18. Locked Candidates Type 1 (Pointing): 7 in b7 => r8c4<>7
19. Naked Pair: 4,8 in r9c38 => r9c46<>4, r9c46<>8
20. Empty Rectangle: 7 in b5 (r2c35) => r4c3<>7
21. W-Wing: 6/3 in r2c4,r5c7 connected by 3 in r1c47 => r2c7<>6
22. Row 2 / Column 4 → 6 (Hidden Single)
23. Row 3 / Column 4 → 2 (Naked Single)
24. Row 1 / Column 4 → 3 (Naked Single)
25. Row 1 / Column 2 → 2 (Hidden Single)
26. Row 7 / Column 2 → 3 (Naked Single)
27. Row 5 / Column 2 → 7 (Naked Single)
28. Row 7 / Column 1 → 2 (Naked Single)
29. Row 5 / Column 8 → 6 (Naked Single)
30. Row 5 / Column 7 → 3 (Naked Single)
31. Row 4 / Column 1 → 3 (Hidden Single)
32. Row 4 / Column 8 → 7 (Hidden Single)
33. Row 6 / Column 5 → 7 (Hidden Single)
34. Row 3 / Column 7 → 6 (Hidden Single)
35. Row 2 / Column 9 → 3 (Hidden Single)
36. Row 9 / Column 4 → 7 (Hidden Single)
37. Row 9 / Column 6 → 1 (Naked Single)
38. Row 5 / Column 6 → 5 (Naked Single)
39. Row 5 / Column 4 → 1 (Full House)
40. Row 2 / Column 3 → 7 (Hidden Single)
41. Row 3 / Column 1 → 4 (Naked Single)
42. Row 3 / Column 2 → 8 (Full House)
43. Row 8 / Column 2 → 4 (Full House)
44. Row 6 / Column 1 → 5 (Naked Single)
45. Row 8 / Column 1 → 7 (Full House)
46. Row 3 / Column 6 → 7 (Naked Single)
47. Row 3 / Column 8 → 9 (Full House)
48. Row 8 / Column 4 → 8 (Naked Single)
49. Row 8 / Column 3 → 5 (Full House)
50. Row 9 / Column 3 → 8 (Full House)
51. Row 9 / Column 8 → 4 (Full House)
52. Row 7 / Column 8 → 8 (Full House)
53. Row 7 / Column 9 → 9 (Full House)
54. Row 6 / Column 9 → 8 (Naked Single)
55. Row 4 / Column 9 → 5 (Full House)
56. Row 4 / Column 4 → 4 (Naked Single)
57. Row 4 / Column 5 → 8 (Full House)
58. Row 7 / Column 4 → 5 (Full House)
59. Row 7 / Column 6 → 4 (Full House)
60. Row 2 / Column 5 → 4 (Full House)
61. Row 1 / Column 6 → 8 (Full House)
62. Row 2 / Column 7 → 8 (Full House)
63. Row 1 / Column 7 → 4 (Full House)
64. Row 6 / Column 7 → 2 (Naked Single)
65. Row 4 / Column 7 → 9 (Full House)
66. Row 4 / Column 3 → 2 (Full House)
67. Row 6 / Column 3 → 4 (Full House)