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

This Sudoku Puzzle has 72 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Triple, Naked Single, Remote Pair, Empty Rectangle, Locked Candidates Type 2 (Claiming), Swordfish, Skyscraper, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 9 → 6 (Hidden Single)
2. Row 4 / Column 5 → 4 (Hidden Single)
3. Row 6 / Column 8 → 4 (Hidden Single)
4. Row 7 / Column 4 → 6 (Hidden Single)
5. Row 2 / Column 5 → 8 (Hidden Single)
6. Row 1 / Column 4 → 4 (Hidden Single)
7. Row 1 / Column 7 → 3 (Hidden Single)
8. Row 2 / Column 3 → 4 (Hidden Single)
9. Row 5 / Column 5 → 6 (Hidden Single)
10. Row 5 / Column 4 → 2 (Hidden Single)
11. Row 7 / Column 6 → 2 (Hidden Single)
12. Row 9 / Column 2 → 4 (Hidden Single)
13. Row 9 / Column 6 → 9 (Hidden Single)
14. Row 9 / Column 3 → 3 (Hidden Single)
15. Row 9 / Column 5 → 5 (Hidden Single)
16. Row 9 / Column 7 → 6 (Hidden Single)
17. Row 8 / Column 3 → 6 (Hidden Single)
18. Row 9 / Column 8 → 8 (Hidden Single)
19. Row 8 / Column 1 → 5 (Hidden Single)
20. Row 4 / Column 3 → 5 (Hidden Single)
21. Row 5 / Column 9 → 5 (Hidden Single)
22. Locked Candidates Type 1 (Pointing): 2 in b1 => r3c8<>2
23. Row 2 / Column 8 → 2 (Hidden Single)
24. Locked Candidates Type 1 (Pointing): 1 in b5 => r6c79<>1
25. Naked Triple: 1,7,9 in r1c23,r2c1 => r3c12<>1, r3c123<>7
26. Row 3 / Column 3 → 2 (Naked Single)
27. Row 4 / Column 2 → 2 (Hidden Single)
28. Naked Triple: 1,7,9 in r178c2 => r5c2<>7, r5c2<>9
29. Locked Candidates Type 1 (Pointing): 9 in b4 => r6c79<>9
30. Remote Pair: 7/1 r6c5 -1- r8c5 -7- r9c4 -1- r9c9 => r6c9<>7
31. Empty Rectangle: 1 in b3 (r27c1) => r7c8<>1
32. Locked Candidates Type 2 (Claiming): 1 in r7 => r8c2<>1
33. Locked Candidates Type 2 (Claiming): 1 in c8 => r2c79<>1
34. Row 2 / Column 1 → 1 (Hidden Single)
35. Row 7 / Column 2 → 1 (Hidden Single)
36. Locked Candidates Type 1 (Pointing): 7 in b1 => r1c68<>7
37. Locked Candidates Type 1 (Pointing): 9 in b1 => r1c8<>9
38. Locked Candidates Type 1 (Pointing): 7 in b2 => r3c8<>7
39. Swordfish: 7 c235 r168 => r6c167,r8c79<>7
40. Skyscraper: 7 in r4c1,r5c8 (connected by r7c18) => r4c79<>7
41. Row 4 / Column 7 → 1 (Naked Single)
42. Row 4 / Column 9 → 3 (Naked Single)
43. Row 4 / Column 1 → 7 (Full House)
44. Row 6 / Column 9 → 2 (Naked Single)
45. Row 6 / Column 3 → 9 (Naked Single)
46. Row 1 / Column 3 → 7 (Full House)
47. Row 7 / Column 1 → 9 (Naked Single)
48. Row 7 / Column 8 → 7 (Full House)
49. Row 8 / Column 2 → 7 (Full House)
50. Row 6 / Column 7 → 8 (Naked Single)
51. Row 1 / Column 2 → 9 (Naked Single)
52. Row 5 / Column 8 → 9 (Naked Single)
53. Row 5 / Column 7 → 7 (Full House)
54. Row 9 / Column 9 → 1 (Naked Single)
55. Row 9 / Column 4 → 7 (Full House)
56. Row 8 / Column 5 → 1 (Full House)
57. Row 3 / Column 4 → 1 (Full House)
58. Row 6 / Column 5 → 7 (Full House)
59. Row 6 / Column 1 → 3 (Naked Single)
60. Row 3 / Column 1 → 8 (Full House)
61. Row 5 / Column 2 → 8 (Full House)
62. Row 5 / Column 6 → 3 (Full House)
63. Row 6 / Column 6 → 1 (Full House)
64. Row 3 / Column 2 → 3 (Full House)
65. Row 2 / Column 7 → 9 (Naked Single)
66. Row 2 / Column 9 → 7 (Full House)
67. Row 8 / Column 9 → 9 (Full House)
68. Row 8 / Column 7 → 2 (Full House)
69. Row 1 / Column 6 → 5 (Naked Single)
70. Row 1 / Column 8 → 1 (Full House)
71. Row 3 / Column 8 → 5 (Full House)
72. Row 3 / Column 6 → 7 (Full House)