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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 8 → 9 (Naked Single)
2. Row 6 / Column 9 → 5 (Naked Single)
3. Row 6 / Column 4 → 7 (Naked Single)
4. Row 3 / Column 4 → 4 (Hidden Single)
5. Row 4 / Column 8 → 1 (Hidden Single)
6. Row 2 / Column 2 → 1 (Hidden Single)
7. Row 1 / Column 4 → 1 (Hidden Single)
8. Locked Candidates Type 1 (Pointing): 5 in b1 => r3c5<>5
9. Locked Candidates Type 1 (Pointing): 2 in b6 => r5c45<>2
10. Locked Candidates Type 1 (Pointing): 6 in b6 => r5c123<>6
11. Locked Candidates Type 2 (Claiming): 7 in r2 => r1c56,r3c5<>7
12. Naked Triple: 2,5,9 in r4c46,r5c4 => r5c5<>5, r5c5<>9
13. Row 7 / Column 5 → 9 (Hidden Single)
14. Row 1 / Column 7 → 9 (Hidden Single)
15. Row 8 / Column 9 → 9 (Hidden Single)
16. Row 7 / Column 6 → 2 (Hidden Single)
17. Row 4 / Column 6 → 5 (Naked Single)
18. Row 4 / Column 2 → 6 (Naked Single)
19. Row 5 / Column 4 → 9 (Naked Single)
20. Row 4 / Column 1 → 7 (Naked Single)
21. Row 4 / Column 4 → 2 (Naked Single)
22. Row 4 / Column 3 → 9 (Full House)
23. Naked Pair: 3,8 in r35c5 => r12c5<>3, r1c5<>8
24. Row 1 / Column 5 → 2 (Naked Single)
25. Row 5 / Column 9 → 2 (Hidden Single)
26. Row 5 / Column 7 → 6 (Full House)
27. Row 2 / Column 7 → 2 (Hidden Single)
28. XYZ-Wing: 3/6/8 in r23c8,r3c5 => r3c7<>3
29. Row 3 / Column 7 → 1 (Naked Single)
30. Row 9 / Column 7 → 5 (Naked Single)
31. Row 7 / Column 7 → 3 (Full House)
32. Row 9 / Column 5 → 7 (Naked Single)
33. Row 2 / Column 5 → 5 (Naked Single)
34. Row 2 / Column 4 → 6 (Naked Single)
35. Row 8 / Column 4 → 5 (Full House)
36. Row 2 / Column 8 → 3 (Naked Single)
37. Row 2 / Column 6 → 7 (Full House)
38. Row 5 / Column 2 → 5 (Hidden Single)
39. Hidden Rectangle: 1/6 in r7c39,r9c39 => r9c3<>6
40. Finned X-Wing: 3 c15 r35 fr1c1 => r3c3<>3
41. Finned Swordfish: 8 r359 c159 fr3c8 => r1c9<>8
42. Row 1 / Column 6 → 8 (Hidden Single)
43. Row 3 / Column 5 → 3 (Full House)
44. Row 5 / Column 5 → 8 (Full House)
45. Row 6 / Column 6 → 3 (Full House)
46. Row 6 / Column 2 → 8 (Full House)
47. Row 8 / Column 2 → 3 (Full House)
48. Row 9 / Column 1 → 8 (Hidden Single)
49. Row 8 / Column 8 → 8 (Hidden Single)
50. Row 3 / Column 8 → 6 (Naked Single)
51. Row 7 / Column 8 → 4 (Full House)
52. Row 1 / Column 9 → 7 (Naked Single)
53. Row 3 / Column 9 → 8 (Full House)
54. Row 3 / Column 1 → 5 (Naked Single)
55. Row 3 / Column 3 → 7 (Full House)
56. Row 7 / Column 1 → 6 (Naked Single)
57. Row 1 / Column 1 → 3 (Naked Single)
58. Row 1 / Column 3 → 6 (Full House)
59. Row 5 / Column 1 → 4 (Full House)
60. Row 5 / Column 3 → 3 (Full House)
61. Row 7 / Column 9 → 1 (Naked Single)
62. Row 7 / Column 3 → 5 (Full House)
63. Row 9 / Column 9 → 6 (Full House)
64. Row 8 / Column 3 → 4 (Naked Single)
65. Row 8 / Column 6 → 6 (Full House)
66. Row 9 / Column 6 → 4 (Full House)
67. Row 9 / Column 3 → 1 (Full House)