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

This Sudoku Puzzle has 68 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Single, Full House, Hidden Triple, undefined techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 9 → 2 (Hidden Single)
2. Row 7 / Column 3 → 2 (Hidden Single)
3. Row 9 / Column 9 → 6 (Hidden Single)
4. Row 2 / Column 4 → 2 (Hidden Single)
5. Row 5 / Column 8 → 2 (Hidden Single)
6. Row 3 / Column 7 → 4 (Hidden Single)
7. Row 7 / Column 9 → 4 (Hidden Single)
8. Row 9 / Column 5 → 4 (Hidden Single)
9. Row 5 / Column 9 → 9 (Hidden Single)
10. Row 7 / Column 5 → 9 (Hidden Single)
11. Row 9 / Column 4 → 7 (Hidden Single)
12. Locked Candidates Type 1 (Pointing): 1 in b8 => r8c123<>1
13. Locked Candidates Type 1 (Pointing): 5 in b8 => r8c8<>5
14. Locked Candidates Type 2 (Claiming): 8 in r3 => r1c13,r2c12<>8
15. Locked Candidates Type 2 (Claiming): 3 in c9 => r1c7,r2c8<>3
16. Locked Candidates Type 2 (Claiming): 8 in c9 => r1c7,r2c8<>8
17. Naked Pair: 5,7 in r1c57 => r1c136<>5, r1c16<>7
18. Row 1 / Column 6 → 8 (Naked Single)
19. Row 1 / Column 9 → 3 (Naked Single)
20. Row 2 / Column 9 → 8 (Full House)
21. Hidden Triple: 4,6,9 in r468c2 => r46c2<>3, r6c2<>1, r68c2<>8
22. X-Wing: 7 r15 c57 => r3c5,r4c7<>7
23. Row 4 / Column 7 → 3 (Naked Single)
24. Row 4 / Column 4 → 5 (Naked Single)
25. Row 8 / Column 4 → 1 (Naked Single)
26. Row 6 / Column 4 → 3 (Full House)
27. Row 8 / Column 6 → 5 (Full House)
28. Locked Candidates Type 2 (Claiming): 7 in r3 => r2c12<>7
29. Naked Pair: 6,9 in r14c3 => r8c3<>6, r89c3<>9
30. Row 8 / Column 3 → 8 (Naked Single)
31. Row 8 / Column 8 → 9 (Naked Single)
32. Row 9 / Column 1 → 9 (Hidden Single)
33. Row 1 / Column 1 → 6 (Naked Single)
34. Row 1 / Column 3 → 9 (Naked Single)
35. Row 8 / Column 1 → 4 (Naked Single)
36. Row 8 / Column 2 → 6 (Full House)
37. Row 4 / Column 3 → 6 (Naked Single)
38. Naked Pair: 1,5 in r3c35 => r3c12<>1, r3c1<>5
39. XY-Chain: 8 8- r5c7 -7- r5c5 -1- r3c5 -5- r3c3 -1- r9c3 -3- r9c8 -8- r6c8 -4- r6c2 -9- r6c6 -1- r6c1 -8 => r5c12,r6c8<>8
40. Row 6 / Column 8 → 4 (Naked Single)
41. Row 4 / Column 8 → 7 (Naked Single)
42. Row 5 / Column 7 → 8 (Full House)
43. Row 6 / Column 2 → 9 (Naked Single)
44. Row 2 / Column 8 → 5 (Naked Single)
45. Row 1 / Column 7 → 7 (Full House)
46. Row 1 / Column 5 → 5 (Full House)
47. Row 4 / Column 6 → 9 (Naked Single)
48. Row 4 / Column 2 → 4 (Full House)
49. Row 9 / Column 7 → 1 (Naked Single)
50. Row 7 / Column 7 → 5 (Full House)
51. Row 6 / Column 6 → 1 (Naked Single)
52. Row 2 / Column 6 → 7 (Full House)
53. Row 3 / Column 5 → 1 (Full House)
54. Row 5 / Column 5 → 7 (Full House)
55. Row 6 / Column 1 → 8 (Full House)
56. Row 7 / Column 8 → 3 (Naked Single)
57. Row 9 / Column 8 → 8 (Full House)
58. Row 9 / Column 3 → 3 (Full House)
59. Row 3 / Column 3 → 5 (Naked Single)
60. Row 5 / Column 3 → 1 (Full House)
61. Row 3 / Column 1 → 7 (Naked Single)
62. Row 3 / Column 2 → 8 (Full House)
63. Row 5 / Column 2 → 3 (Naked Single)
64. Row 5 / Column 1 → 5 (Full House)
65. Row 7 / Column 1 → 1 (Naked Single)
66. Row 2 / Column 1 → 3 (Full House)
67. Row 2 / Column 2 → 1 (Full House)
68. Row 7 / Column 2 → 7 (Full House)