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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 9 → 2 (Hidden Single)
2. Row 3 / Column 4 → 7 (Hidden Single)
3. Row 8 / Column 8 → 2 (Hidden Single)
4. Row 3 / Column 1 → 2 (Hidden Single)
5. Row 1 / Column 6 → 2 (Hidden Single)
6. Row 7 / Column 4 → 2 (Hidden Single)
7. Row 3 / Column 8 → 1 (Hidden Single)
8. Row 7 / Column 9 → 1 (Hidden Single)
9. Locked Triple: 1,4,5 in r5c123 => r4c2,r5c5<>1, r46c2,r5c57,r6c3<>4, r5c57,r6c3<>5
10. Row 4 / Column 2 → 9 (Naked Single)
11. Row 4 / Column 5 → 1 (Hidden Single)
12. Row 1 / Column 7 → 5 (Hidden Single)
13. Row 6 / Column 9 → 5 (Hidden Single)
14. Locked Candidates Type 1 (Pointing): 4 in b5 => r8c4<>4
15. Locked Candidates Type 1 (Pointing): 4 in b6 => r129c8<>4
16. Locked Candidates Type 1 (Pointing): 4 in b3 => r9c9<>4
17. Locked Candidates Type 1 (Pointing): 7 in b9 => r9c3<>7
18. Locked Candidates Type 2 (Claiming): 4 in r8 => r7c123,r9c13<>4
19. Hidden Pair: 3,7 in r7c23 => r7c23<>6, r7c3<>8, r7c3<>9
20. Empty Rectangle: 8 in b9 (r5c57) => r9c5<>8
21. Hidden Rectangle: 1/4 in r5c12,r8c12 => r8c1<>4
22. Discontinuous Nice Loop: 3 r1c8 -3- r4c8 -4- r4c4 -5- r8c4 -8- r8c3 =8= r9c3 -8- r9c9 -7- r9c8 =7= r1c8 => r1c8<>3
23. X-Wing: 3 c68 r24 => r2c25<>3
24. Row 7 / Column 2 → 3 (Hidden Single)
25. Row 7 / Column 3 → 7 (Naked Single)
26. Row 6 / Column 3 → 6 (Naked Single)
27. Row 6 / Column 2 → 7 (Naked Single)
28. Empty Rectangle: 6 in b9 (r3c57) => r9c5<>6
29. Discontinuous Nice Loop: 9 r2c6 -9- r6c6 -8- r5c5 -3- r4c6 =3= r2c6 => r2c6<>9
30. Discontinuous Nice Loop: 8 r2c8 -8- r3c9 -9- r3c3 -3- r3c7 =3= r2c8 => r2c8<>8
31. AIC: 8 8- r5c5 -3- r5c7 =3= r3c7 -3- r2c8 -6- r2c2 -4- r8c2 =4= r8c3 =8= r9c3 -8- r9c8 =8= r6c8 -8 => r5c7,r6c46<>8
32. Row 5 / Column 7 → 3 (Naked Single)
33. Row 6 / Column 6 → 9 (Naked Single)
34. Row 4 / Column 8 → 4 (Naked Single)
35. Row 6 / Column 8 → 8 (Full House)
36. Row 6 / Column 4 → 4 (Full House)
37. Row 5 / Column 5 → 8 (Naked Single)
38. Row 4 / Column 4 → 5 (Naked Single)
39. Row 4 / Column 6 → 3 (Full House)
40. Row 8 / Column 4 → 8 (Naked Single)
41. Row 2 / Column 4 → 9 (Full House)
42. Row 7 / Column 6 → 6 (Naked Single)
43. Row 7 / Column 1 → 9 (Naked Single)
44. Row 8 / Column 6 → 5 (Naked Single)
45. Row 2 / Column 6 → 8 (Full House)
46. Row 7 / Column 5 → 4 (Naked Single)
47. Row 7 / Column 7 → 8 (Full House)
48. Row 9 / Column 5 → 9 (Full House)
49. Row 8 / Column 3 → 4 (Naked Single)
50. Row 2 / Column 9 → 4 (Naked Single)
51. Row 3 / Column 7 → 6 (Naked Single)
52. Row 9 / Column 7 → 4 (Full House)
53. Row 9 / Column 9 → 7 (Naked Single)
54. Row 9 / Column 8 → 6 (Full House)
55. Row 5 / Column 3 → 5 (Naked Single)
56. Row 2 / Column 2 → 6 (Naked Single)
57. Row 1 / Column 8 → 7 (Naked Single)
58. Row 2 / Column 8 → 3 (Full House)
59. Row 2 / Column 5 → 5 (Full House)
60. Row 3 / Column 5 → 3 (Naked Single)
61. Row 1 / Column 5 → 6 (Full House)
62. Row 1 / Column 9 → 9 (Naked Single)
63. Row 3 / Column 9 → 8 (Full House)
64. Row 3 / Column 3 → 9 (Full House)
65. Row 9 / Column 1 → 5 (Naked Single)
66. Row 9 / Column 3 → 8 (Full House)
67. Row 1 / Column 3 → 3 (Full House)
68. Row 1 / Column 1 → 4 (Full House)
69. Row 8 / Column 2 → 1 (Naked Single)
70. Row 5 / Column 2 → 4 (Full House)
71. Row 5 / Column 1 → 1 (Full House)
72. Row 8 / Column 1 → 6 (Full House)