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

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Single, Hidden Pair, Empty Rectangle, undefined, Uniqueness Test 1, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 9 → 3 (Hidden Single)
2. Row 1 / Column 2 → 2 (Hidden Single)
3. Row 8 / Column 1 → 6 (Hidden Single)
4. Row 3 / Column 2 → 8 (Hidden Single)
5. Row 8 / Column 2 → 3 (Hidden Single)
6. Row 3 / Column 1 → 9 (Hidden Single)
7. Row 4 / Column 1 → 3 (Hidden Single)
8. Row 9 / Column 1 → 4 (Hidden Single)
9. Row 4 / Column 3 → 4 (Hidden Single)
10. Locked Candidates Type 1 (Pointing): 5 in b1 => r2c567<>5
11. Locked Candidates Type 1 (Pointing): 7 in b1 => r2c567<>7
12. Row 1 / Column 7 → 7 (Hidden Single)
13. Row 8 / Column 7 → 4 (Hidden Single)
14. Naked Pair: 1,5 in r7c26 => r7c47<>1, r7c478<>5
15. Row 7 / Column 4 → 3 (Naked Single)
16. Row 9 / Column 8 → 3 (Hidden Single)
17. Naked Pair: 5,7 in r38c5 => r46c5<>5, r6c5<>7
18. Naked Pair: 6,8 in r27c7 => r4c7<>6, r46c7<>8
19. Locked Candidates Type 1 (Pointing): 8 in b6 => r1c9<>8
20. Hidden Pair: 2,8 in r46c9 => r46c9<>1, r46c9<>5, r4c9<>6, r46c9<>9
21. Locked Candidates Type 1 (Pointing): 1 in b6 => r9c7<>1
22. Locked Candidates Type 1 (Pointing): 6 in b6 => r5c46<>6
23. Empty Rectangle: 7 in b5 (r59c2) => r9c4<>7
24. W-Wing: 2/8 in r2c5,r4c9 connected by 8 in r6c59 => r4c5<>2
25. Uniqueness Test 1: 5/7 in r2c13,r6c13 => r6c3<>5, r6c3<>7
26. Row 6 / Column 3 → 1 (Naked Single)
27. Row 4 / Column 7 → 1 (Hidden Single)
28. Row 8 / Column 9 → 1 (Hidden Single)
29. Locked Candidates Type 1 (Pointing): 5 in b9 => r9c246<>5
30. W-Wing: 5/9 in r4c2,r6c7 connected by 9 in r46c5 => r6c1<>5
31. Row 6 / Column 1 → 7 (Naked Single)
32. Row 2 / Column 1 → 5 (Full House)
33. Row 2 / Column 3 → 7 (Full House)
34. Row 8 / Column 3 → 5 (Full House)
35. Row 8 / Column 5 → 7 (Full House)
36. Row 7 / Column 2 → 1 (Naked Single)
37. Row 9 / Column 2 → 7 (Full House)
38. Row 3 / Column 5 → 5 (Naked Single)
39. Row 7 / Column 6 → 5 (Naked Single)
40. Row 1 / Column 4 → 4 (Naked Single)
41. Row 3 / Column 8 → 6 (Naked Single)
42. Row 1 / Column 6 → 8 (Naked Single)
43. Row 2 / Column 7 → 8 (Naked Single)
44. Row 3 / Column 9 → 4 (Naked Single)
45. Row 7 / Column 8 → 8 (Naked Single)
46. Row 7 / Column 7 → 6 (Full House)
47. Row 2 / Column 5 → 2 (Naked Single)
48. Row 2 / Column 6 → 6 (Full House)
49. Row 4 / Column 6 → 2 (Naked Single)
50. Row 4 / Column 9 → 8 (Naked Single)
51. Row 6 / Column 4 → 5 (Naked Single)
52. Row 9 / Column 6 → 1 (Naked Single)
53. Row 9 / Column 4 → 2 (Full House)
54. Row 4 / Column 5 → 9 (Naked Single)
55. Row 6 / Column 5 → 8 (Full House)
56. Row 6 / Column 9 → 2 (Naked Single)
57. Row 6 / Column 7 → 9 (Full House)
58. Row 9 / Column 7 → 5 (Full House)
59. Row 9 / Column 9 → 9 (Full House)
60. Row 4 / Column 4 → 6 (Naked Single)
61. Row 4 / Column 2 → 5 (Full House)
62. Row 5 / Column 2 → 9 (Full House)
63. Row 5 / Column 4 → 7 (Naked Single)
64. Row 3 / Column 4 → 1 (Full House)
65. Row 3 / Column 6 → 7 (Full House)
66. Row 5 / Column 6 → 4 (Full House)
67. Row 5 / Column 8 → 5 (Naked Single)
68. Row 1 / Column 8 → 9 (Full House)
69. Row 1 / Column 9 → 5 (Full House)
70. Row 5 / Column 9 → 6 (Full House)