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

This Sudoku Puzzle has 71 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Uniqueness Test 1, Empty Rectangle, Naked Triple, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 8 / Column 2 → 5 (Naked Single)
2. Row 4 / Column 3 → 8 (Hidden Single)
3. Row 9 / Column 3 → 3 (Hidden Single)
4. Row 8 / Column 8 → 3 (Hidden Single)
5. Row 1 / Column 8 → 4 (Naked Single)
6. Row 7 / Column 5 → 5 (Hidden Single)
7. Row 9 / Column 1 → 2 (Hidden Single)
8. Row 7 / Column 8 → 8 (Hidden Single)
9. Row 9 / Column 7 → 9 (Hidden Single)
10. Row 8 / Column 1 → 8 (Hidden Single)
11. Locked Candidates Type 1 (Pointing): 4 in b7 => r7c79<>4
12. Row 6 / Column 7 → 4 (Hidden Single)
13. Row 9 / Column 9 → 4 (Hidden Single)
14. Row 9 / Column 6 → 7 (Naked Single)
15. Row 6 / Column 4 → 3 (Hidden Single)
16. Row 6 / Column 1 → 5 (Hidden Single)
17. Naked Pair: 1,6 in r2c8,r3c7 => r3c9<>1, r3c9<>6
18. Row 3 / Column 9 → 7 (Naked Single)
19. Naked Pair: 1,6 in r37c7 => r5c7<>1, r5c7<>6
20. X-Wing: 2 r15 c35 => r6c35<>2
21. Uniqueness Test 1: 3/5 in r1c79,r5c79 => r5c9<>3, r5c9<>5
22. Row 5 / Column 7 → 3 (Hidden Single)
23. Row 1 / Column 7 → 5 (Naked Single)
24. Row 1 / Column 9 → 3 (Naked Single)
25. Row 5 / Column 4 → 5 (Hidden Single)
26. Row 4 / Column 9 → 5 (Hidden Single)
27. Empty Rectangle: 6 in b6 (r2c18) => r5c1<>6
28. Locked Candidates Type 1 (Pointing): 6 in b4 => r3c3<>6
29. Naked Triple: 4,8,9 in r3c345 => r3c1<>4, r3c1<>9
30. XY-Wing: 7/9/4 in r17c1,r3c3 => r2c1,r7c3<>4
31. Row 7 / Column 3 → 7 (Naked Single)
32. Row 7 / Column 1 → 4 (Full House)
33. Row 3 / Column 3 → 4 (Hidden Single)
34. Row 4 / Column 5 → 4 (Hidden Single)
35. Locked Candidates Type 1 (Pointing): 9 in b1 => r1c5<>9
36. Locked Candidates Type 1 (Pointing): 7 in b4 => r2c2<>7
37. W-Wing: 6/9 in r4c6,r6c3 connected by 9 in r46c8 => r6c6<>6
38. Row 4 / Column 6 → 6 (Hidden Single)
39. W-Wing: 9/2 in r1c3,r6c6 connected by 2 in r2c26 => r6c3<>9
40. Row 6 / Column 3 → 6 (Naked Single)
41. Row 5 / Column 9 → 6 (Hidden Single)
42. Row 7 / Column 9 → 1 (Full House)
43. Row 7 / Column 7 → 6 (Full House)
44. Row 3 / Column 7 → 1 (Full House)
45. Row 2 / Column 8 → 6 (Full House)
46. Row 3 / Column 1 → 6 (Naked Single)
47. Locked Candidates Type 1 (Pointing): 9 in b4 => r5c5<>9
48. W-Wing: 1/7 in r2c1,r4c2 connected by 7 in r24c4 => r2c2,r5c1<>1
49. Row 2 / Column 2 → 2 (Naked Single)
50. Row 5 / Column 1 → 9 (Naked Single)
51. Row 1 / Column 3 → 9 (Naked Single)
52. Row 5 / Column 3 → 2 (Full House)
53. Row 5 / Column 5 → 1 (Full House)
54. Row 2 / Column 6 → 4 (Naked Single)
55. Row 1 / Column 1 → 7 (Naked Single)
56. Row 1 / Column 5 → 2 (Full House)
57. Row 2 / Column 1 → 1 (Full House)
58. Row 2 / Column 4 → 7 (Full House)
59. Row 9 / Column 5 → 8 (Naked Single)
60. Row 9 / Column 4 → 1 (Full House)
61. Row 8 / Column 6 → 9 (Naked Single)
62. Row 6 / Column 6 → 2 (Full House)
63. Row 8 / Column 4 → 4 (Full House)
64. Row 4 / Column 4 → 9 (Naked Single)
65. Row 3 / Column 4 → 8 (Full House)
66. Row 3 / Column 5 → 9 (Full House)
67. Row 6 / Column 5 → 7 (Full House)
68. Row 4 / Column 8 → 1 (Naked Single)
69. Row 4 / Column 2 → 7 (Full House)
70. Row 6 / Column 2 → 1 (Full House)
71. Row 6 / Column 8 → 9 (Full House)