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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 9 → 5 (Naked Single)
2. Row 2 / Column 7 → 3 (Naked Single)
3. Row 3 / Column 8 → 4 (Naked Single)
4. Row 1 / Column 8 → 6 (Naked Single)
5. Row 1 / Column 7 → 7 (Full House)
6. Row 3 / Column 2 → 5 (Naked Single)
7. Row 5 / Column 8 → 9 (Hidden Single)
8. Row 5 / Column 3 → 7 (Hidden Single)
9. Row 4 / Column 9 → 7 (Hidden Single)
10. Row 1 / Column 2 → 4 (Hidden Single)
11. Row 6 / Column 8 → 3 (Hidden Single)
12. Row 7 / Column 1 → 7 (Hidden Single)
13. Row 6 / Column 9 → 8 (Hidden Single)
14. Row 7 / Column 9 → 4 (Naked Single)
15. Row 8 / Column 9 → 1 (Full House)
16. Row 9 / Column 3 → 4 (Hidden Single)
17. Row 9 / Column 2 → 1 (Hidden Single)
18. Row 5 / Column 2 → 8 (Naked Single)
19. Locked Candidates Type 1 (Pointing): 3 in b4 => r4c56<>3
20. Locked Candidates Type 1 (Pointing): 5 in b4 => r6c56<>5
21. Locked Candidates Type 1 (Pointing): 2 in b5 => r79c6<>2
22. Locked Candidates Type 1 (Pointing): 6 in b5 => r89c5<>6
23. Locked Candidates Type 2 (Claiming): 1 in r5 => r46c6<>1
24. Row 6 / Column 6 → 2 (Naked Single)
25. Row 4 / Column 6 → 8 (Naked Single)
26. Hidden Rectangle: 1/3 in r3c46,r5c46 => r5c6<>3
27. XY-Wing: 3/5/1 in r15c6,r3c4 => r3c6,r5c4<>1
28. Row 3 / Column 4 → 1 (Hidden Single)
29. Row 5 / Column 6 → 1 (Hidden Single)
30. W-Wing: 5/3 in r1c6,r5c4 connected by 3 in r7c46 => r1c4<>5
31. Row 1 / Column 6 → 5 (Hidden Single)
32. Row 9 / Column 6 → 7 (Naked Single)
33. Row 3 / Column 5 → 7 (Hidden Single)
34. Row 5 / Column 5 → 3 (Hidden Single)
35. Row 5 / Column 4 → 5 (Full House)
36. Discontinuous Nice Loop: 2/6/8 r7c4 =3= r7c6 =9= r7c7 =5= r7c3 -5- r6c3 =5= r6c1 =1= r4c1 =3= r1c1 -3- r1c4 =3= r7c4 => r7c4<>2, r7c4<>6, r7c4<>8
37. Row 7 / Column 4 → 3 (Naked Single)
38. Row 1 / Column 4 → 8 (Naked Single)
39. Row 1 / Column 1 → 3 (Full House)
40. Row 7 / Column 6 → 9 (Naked Single)
41. Row 3 / Column 6 → 3 (Full House)
42. Row 2 / Column 5 → 9 (Full House)
43. Row 3 / Column 3 → 9 (Full House)
44. Row 4 / Column 3 → 3 (Hidden Single)
45. Row 8 / Column 7 → 9 (Hidden Single)
46. W-Wing: 5/6 in r6c3,r7c7 connected by 6 in r47c2 => r7c3<>5
47. Row 7 / Column 7 → 5 (Hidden Single)
48. Row 9 / Column 7 → 6 (Naked Single)
49. Row 9 / Column 4 → 2 (Naked Single)
50. Row 8 / Column 4 → 6 (Full House)
51. Row 9 / Column 8 → 8 (Naked Single)
52. Row 7 / Column 8 → 2 (Full House)
53. Row 9 / Column 5 → 5 (Full House)
54. Row 8 / Column 5 → 8 (Full House)
55. Row 7 / Column 2 → 6 (Naked Single)
56. Row 4 / Column 2 → 2 (Full House)
57. Row 7 / Column 3 → 8 (Full House)
58. Row 4 / Column 1 → 1 (Naked Single)
59. Row 2 / Column 3 → 2 (Naked Single)
60. Row 2 / Column 1 → 8 (Full House)
61. Row 4 / Column 7 → 4 (Naked Single)
62. Row 4 / Column 5 → 6 (Full House)
63. Row 6 / Column 7 → 1 (Full House)
64. Row 6 / Column 5 → 4 (Full House)
65. Row 6 / Column 1 → 5 (Naked Single)
66. Row 6 / Column 3 → 6 (Full House)
67. Row 8 / Column 3 → 5 (Full House)
68. Row 8 / Column 1 → 2 (Full House)