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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 2 → 8 (Hidden Single)
2. Row 3 / Column 1 → 1 (Hidden Single)
3. Row 2 / Column 8 → 3 (Hidden Single)
4. Row 7 / Column 2 → 1 (Hidden Single)
5. Row 3 / Column 5 → 9 (Hidden Single)
6. Row 1 / Column 1 → 9 (Hidden Single)
7. Row 8 / Column 2 → 9 (Hidden Single)
8. Row 7 / Column 7 → 9 (Hidden Single)
9. Row 1 / Column 3 → 3 (Hidden Single)
10. Row 5 / Column 1 → 3 (Hidden Single)
11. Row 6 / Column 8 → 9 (Hidden Single)
12. Row 5 / Column 6 → 9 (Hidden Single)
13. Locked Candidates Type 1 (Pointing): 4 in b2 => r1c78<>4
14. Locked Candidates Type 1 (Pointing): 7 in b3 => r1c46<>7
15. Locked Candidates Type 1 (Pointing): 8 in b8 => r7c9<>8
16. Locked Candidates Type 2 (Claiming): 2 in c1 => r79c3<>2
17. Locked Candidates Type 2 (Claiming): 5 in c1 => r7c3<>5
18. Naked Triple: 4,7,8 in r9c379 => r9c5<>4
19. X-Wing: 3 r68 c47 => r4c47,r7c4<>3
20. Naked Triple: 2,5,6 in r4c278 => r4c456<>2, r4c459<>5, r4c569<>6
21. 2-String Kite: 5 in r2c4,r5c3 (connected by r2c2,r3c3) => r5c4<>5
22. XYZ-Wing: 2/5/6 in r5c35,r6c6 => r5c4<>2
23. Row 5 / Column 4 → 1 (Naked Single)
24. Row 1 / Column 6 → 1 (Hidden Single)
25. Row 4 / Column 9 → 1 (Hidden Single)
26. Row 4 / Column 5 → 3 (Hidden Single)
27. Row 7 / Column 9 → 3 (Hidden Single)
28. Row 6 / Column 7 → 3 (Hidden Single)
29. Row 8 / Column 4 → 3 (Hidden Single)
30. Row 7 / Column 1 → 5 (Hidden Single)
31. Row 8 / Column 1 → 6 (Naked Single)
32. Row 9 / Column 1 → 2 (Full House)
33. Row 9 / Column 5 → 6 (Naked Single)
34. Row 6 / Column 6 → 6 (Hidden Single)
35. Row 4 / Column 2 → 6 (Hidden Single)
36. Locked Candidates Type 2 (Claiming): 2 in r4 => r5c7<>2
37. Locked Candidates Type 2 (Claiming): 5 in r4 => r5c79<>5
38. Locked Candidates Type 2 (Claiming): 5 in c9 => r1c78,r3c78<>5
39. X-Wing: 5 r26 c24 => r1c4<>5
40. W-Wing: 4/2 in r1c4,r7c5 connected by 2 in r27c6 => r1c5,r7c4<>4
41. Row 1 / Column 4 → 4 (Hidden Single)
42. Row 4 / Column 4 → 8 (Naked Single)
43. Row 4 / Column 6 → 4 (Naked Single)
44. Row 8 / Column 6 → 7 (Naked Single)
45. Row 2 / Column 6 → 2 (Naked Single)
46. Row 7 / Column 6 → 8 (Full House)
47. Row 7 / Column 4 → 2 (Naked Single)
48. Row 7 / Column 5 → 4 (Full House)
49. Row 7 / Column 3 → 7 (Full House)
50. Row 9 / Column 3 → 4 (Full House)
51. Row 1 / Column 5 → 5 (Naked Single)
52. Row 2 / Column 4 → 7 (Full House)
53. Row 2 / Column 2 → 5 (Full House)
54. Row 6 / Column 4 → 5 (Full House)
55. Row 5 / Column 5 → 2 (Full House)
56. Row 3 / Column 3 → 2 (Full House)
57. Row 6 / Column 2 → 2 (Full House)
58. Row 5 / Column 3 → 5 (Full House)
59. Row 3 / Column 8 → 4 (Naked Single)
60. Row 3 / Column 7 → 8 (Naked Single)
61. Row 3 / Column 9 → 5 (Full House)
62. Row 8 / Column 8 → 5 (Naked Single)
63. Row 8 / Column 7 → 4 (Full House)
64. Row 9 / Column 7 → 7 (Naked Single)
65. Row 9 / Column 9 → 8 (Full House)
66. Row 4 / Column 8 → 2 (Naked Single)
67. Row 1 / Column 8 → 7 (Full House)
68. Row 4 / Column 7 → 5 (Full House)
69. Row 5 / Column 7 → 6 (Naked Single)
70. Row 1 / Column 7 → 2 (Full House)
71. Row 1 / Column 9 → 6 (Full House)
72. Row 5 / Column 9 → 7 (Full House)