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

This Sudoku Puzzle has 74 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Locked Candidates Type 2 (Claiming), Skyscraper, undefined, Naked Pair, Hidden Rectangle, Multi Colors 1, Hidden Pair, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 7 → 7 (Hidden Single)
2. Row 6 / Column 6 → 7 (Hidden Single)
3. Row 4 / Column 4 → 4 (Hidden Single)
4. Row 1 / Column 3 → 7 (Hidden Single)
5. Row 4 / Column 1 → 7 (Hidden Single)
6. Row 4 / Column 8 → 8 (Hidden Single)
7. Locked Candidates Type 1 (Pointing): 5 in b4 => r1c2<>5
8. Locked Candidates Type 1 (Pointing): 9 in b4 => r5c59<>9
9. Row 5 / Column 9 → 6 (Naked Single)
10. Row 2 / Column 6 → 6 (Hidden Single)
11. Row 6 / Column 5 → 6 (Hidden Single)
12. Row 2 / Column 7 → 8 (Hidden Single)
13. Row 5 / Column 6 → 8 (Hidden Single)
14. Row 2 / Column 2 → 4 (Hidden Single)
15. Row 2 / Column 8 → 9 (Hidden Single)
16. Locked Candidates Type 1 (Pointing): 9 in b6 => r79c9<>9
17. Locked Candidates Type 2 (Claiming): 3 in c6 => r79c5,r8c4<>3
18. Skyscraper: 3 in r2c3,r6c2 (connected by r26c4) => r1c2,r5c3<>3
19. Row 1 / Column 2 → 6 (Naked Single)
20. Row 3 / Column 7 → 6 (Hidden Single)
21. Finned X-Wing: 2 c26 r48 fr7c6 => r8c4<>2
22. Row 1 / Column 4 → 2 (Hidden Single)
23. Row 3 / Column 9 → 2 (Hidden Single)
24. Locked Candidates Type 1 (Pointing): 1 in b3 => r1c15<>1
25. Locked Candidates Type 1 (Pointing): 5 in b3 => r1c1<>5
26. Naked Pair: 1,5 in r16c8 => r89c8<>1
27. X-Wing: 3 r15 c15 => r789c1<>3
28. Hidden Rectangle: 1/5 in r3c13,r7c13 => r7c1<>1
29. Finned X-Wing: 2 r57 c35 fr7c6 => r9c5<>2
30. XY-Chain: 1 1- r3c5 -8- r1c5 -3- r5c5 -2- r4c6 -1 => r4c5<>1
31. XY-Chain: 9 9- r5c1 -3- r1c1 -8- r1c5 -3- r2c4 -1- r8c4 -9 => r8c1<>9
32. Row 8 / Column 4 → 9 (Hidden Single)
33. Row 6 / Column 9 → 9 (Hidden Single)
34. Row 4 / Column 5 → 9 (Hidden Single)
35. Multi Colors 1: 1 (r1c8,r2c3,r3c5,r4c9,r6c4) / (r2c4,r4c6,r6c8), (r8c1) / (r8c6) => r3c1,r79c3<>1
36. Hidden Pair: 1,6 in r89c1 => r9c1<>9
37. XYZ-Wing: 2/3/9 in r59c3,r8c2 => r7c3<>2
38. Locked Candidates Type 2 (Claiming): 2 in r7 => r8c6<>2
39. W-Wing: 1/3 in r6c4,r8c6 connected by 3 in r68c2 => r4c6<>1
40. Row 4 / Column 6 → 2 (Naked Single)
41. Row 4 / Column 2 → 5 (Naked Single)
42. Row 4 / Column 9 → 1 (Full House)
43. Row 6 / Column 8 → 5 (Full House)
44. Row 5 / Column 5 → 3 (Naked Single)
45. Row 6 / Column 4 → 1 (Full House)
46. Row 6 / Column 2 → 3 (Full House)
47. Row 2 / Column 4 → 3 (Full House)
48. Row 8 / Column 2 → 2 (Full House)
49. Row 2 / Column 3 → 1 (Full House)
50. Row 1 / Column 8 → 1 (Naked Single)
51. Row 1 / Column 5 → 8 (Naked Single)
52. Row 3 / Column 5 → 1 (Full House)
53. Row 5 / Column 1 → 9 (Naked Single)
54. Row 5 / Column 3 → 2 (Full House)
55. Row 8 / Column 8 → 6 (Naked Single)
56. Row 9 / Column 8 → 2 (Full House)
57. Row 3 / Column 3 → 5 (Naked Single)
58. Row 3 / Column 1 → 8 (Full House)
59. Row 1 / Column 1 → 3 (Full House)
60. Row 1 / Column 7 → 4 (Naked Single)
61. Row 1 / Column 9 → 5 (Full House)
62. Row 9 / Column 5 → 4 (Naked Single)
63. Row 7 / Column 5 → 2 (Full House)
64. Row 7 / Column 1 → 5 (Naked Single)
65. Row 8 / Column 1 → 1 (Naked Single)
66. Row 8 / Column 6 → 3 (Full House)
67. Row 9 / Column 1 → 6 (Full House)
68. Row 7 / Column 6 → 1 (Full House)
69. Row 9 / Column 9 → 3 (Naked Single)
70. Row 7 / Column 9 → 4 (Full House)
71. Row 7 / Column 7 → 9 (Naked Single)
72. Row 7 / Column 3 → 3 (Full House)
73. Row 9 / Column 3 → 9 (Full House)
74. Row 9 / Column 7 → 1 (Full House)