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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 7 → 2 (Hidden Single)
2. Row 7 / Column 8 → 5 (Hidden Single)
3. Row 9 / Column 7 → 6 (Hidden Single)
4. Row 9 / Column 9 → 4 (Hidden Single)
5. Locked Candidates Type 1 (Pointing): 6 in b2 => r1c1<>6
6. Locked Candidates Type 1 (Pointing): 5 in b3 => r1c2<>5
7. Locked Candidates Type 1 (Pointing): 9 in b6 => r12c9<>9
8. Locked Candidates Type 1 (Pointing): 1 in b9 => r8c3<>1
9. Locked Candidates Type 2 (Claiming): 9 in r2 => r1c12,r3c23<>9
10. Row 1 / Column 1 → 7 (Naked Single)
11. Row 1 / Column 2 → 1 (Naked Single)
12. Row 1 / Column 9 → 5 (Naked Single)
13. Row 3 / Column 6 → 1 (Hidden Single)
14. Row 7 / Column 3 → 1 (Hidden Single)
15. Locked Pair: 5,8 in r3c23 => r2c13,r3c8<>8
16. Naked Pair: 3,7 in r38c5 => r246c5<>7, r46c5<>3
17. Row 2 / Column 5 → 4 (Naked Single)
18. Row 7 / Column 4 → 4 (Hidden Single)
19. Row 1 / Column 7 → 4 (Hidden Single)
20. Row 4 / Column 6 → 4 (Hidden Single)
21. Row 9 / Column 4 → 2 (Hidden Single)
22. Locked Candidates Type 1 (Pointing): 7 in b2 => r3c8<>7
23. Locked Candidates Type 1 (Pointing): 3 in b3 => r5c8<>3
24. Empty Rectangle: 7 in b5 (r59c8) => r9c6<>7
25. Empty Rectangle: 7 in b5 (r7c26) => r5c2<>7
26. Naked Pair: 5,8 in r35c2 => r4c2<>5, r79c2<>8
27. W-Wing: 7/8 in r5c8,r7c6 connected by 8 in r9c68 => r5c6<>7
28. XY-Wing: 8/9/7 in r79c6,r9c2 => r7c2<>7
29. Row 7 / Column 2 → 2 (Naked Single)
30. Row 7 / Column 1 → 8 (Naked Single)
31. Row 7 / Column 6 → 7 (Full House)
32. Row 6 / Column 6 → 3 (Naked Single)
33. Row 8 / Column 5 → 3 (Naked Single)
34. Row 5 / Column 6 → 6 (Naked Single)
35. Row 3 / Column 5 → 7 (Naked Single)
36. Row 8 / Column 4 → 9 (Naked Single)
37. Row 9 / Column 6 → 8 (Full House)
38. Row 1 / Column 6 → 9 (Full House)
39. Row 5 / Column 4 → 7 (Naked Single)
40. Row 3 / Column 4 → 3 (Naked Single)
41. Row 1 / Column 4 → 6 (Full House)
42. Row 1 / Column 8 → 3 (Full House)
43. Row 8 / Column 1 → 6 (Naked Single)
44. Row 9 / Column 8 → 7 (Naked Single)
45. Row 9 / Column 2 → 9 (Full House)
46. Row 8 / Column 3 → 7 (Full House)
47. Row 5 / Column 8 → 8 (Naked Single)
48. Row 3 / Column 8 → 9 (Full House)
49. Row 2 / Column 1 → 9 (Naked Single)
50. Row 4 / Column 2 → 7 (Naked Single)
51. Row 5 / Column 2 → 5 (Naked Single)
52. Row 3 / Column 2 → 8 (Full House)
53. Row 5 / Column 7 → 3 (Full House)
54. Row 3 / Column 3 → 5 (Full House)
55. Row 2 / Column 3 → 6 (Full House)
56. Row 6 / Column 1 → 2 (Naked Single)
57. Row 4 / Column 1 → 3 (Full House)
58. Row 4 / Column 3 → 9 (Naked Single)
59. Row 6 / Column 3 → 8 (Full House)
60. Row 6 / Column 5 → 5 (Naked Single)
61. Row 4 / Column 5 → 2 (Full House)
62. Row 4 / Column 9 → 1 (Naked Single)
63. Row 4 / Column 7 → 5 (Full House)
64. Row 6 / Column 7 → 7 (Naked Single)
65. Row 6 / Column 9 → 9 (Full House)
66. Row 8 / Column 9 → 8 (Naked Single)
67. Row 2 / Column 9 → 7 (Full House)
68. Row 2 / Column 7 → 8 (Full House)
69. Row 8 / Column 7 → 1 (Full House)