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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 9 → 7 (Hidden Single)
2. Row 2 / Column 7 → 2 (Hidden Single)
3. Row 9 / Column 1 → 5 (Hidden Single)
4. Row 4 / Column 9 → 9 (Hidden Single)
5. Row 8 / Column 8 → 7 (Hidden Single)
6. Row 1 / Column 7 → 5 (Hidden Single)
7. Row 1 / Column 4 → 4 (Naked Single)
8. Row 1 / Column 1 → 8 (Naked Single)
9. Row 8 / Column 4 → 5 (Naked Single)
10. Row 2 / Column 4 → 1 (Naked Single)
11. Row 4 / Column 3 → 5 (Hidden Single)
12. Row 6 / Column 9 → 5 (Hidden Single)
13. Row 9 / Column 7 → 8 (Hidden Single)
14. Row 3 / Column 7 → 9 (Hidden Single)
15. Row 3 / Column 5 → 8 (Hidden Single)
16. Row 2 / Column 5 → 5 (Hidden Single)
17. Row 6 / Column 3 → 2 (Hidden Single)
18. Row 6 / Column 4 → 6 (Naked Single)
19. Row 4 / Column 4 → 2 (Full House)
20. Row 5 / Column 9 → 6 (Hidden Single)
21. Row 4 / Column 2 → 6 (Hidden Single)
22. Row 7 / Column 1 → 6 (Hidden Single)
23. Row 2 / Column 3 → 6 (Hidden Single)
24. Row 4 / Column 5 → 1 (Hidden Single)
25. Row 9 / Column 5 → 6 (Hidden Single)
26. Row 9 / Column 9 → 2 (Hidden Single)
27. Row 7 / Column 5 → 2 (Hidden Single)
28. Row 7 / Column 6 → 7 (Hidden Single)
29. Locked Candidates Type 1 (Pointing): 1 in b6 => r7c7<>1
30. Locked Candidates Type 1 (Pointing): 4 in b8 => r8c239<>4
31. Locked Candidates Type 1 (Pointing): 9 in b8 => r8c23<>9
32. Locked Candidates Type 1 (Pointing): 4 in b9 => r7c23<>4
33. Locked Candidates Type 2 (Claiming): 8 in r5 => r6c2<>8
34. X-Wing: 3 c68 r26 => r2c2,r6c57<>3
35. Locked Candidates Type 1 (Pointing): 3 in b1 => r78c3<>3
36. Naked Triple: 1,4,7 in r6c257 => r6c68<>4
37. XYZ-Wing: 1/4/7 in r5c1,r69c2 => r5c2<>4
38. Hidden Rectangle: 1/8 in r5c23,r8c23 => r5c2<>1
39. Multi Colors 1: 4 (r2c2,r3c9,r4c8,r7c7,r8c6) / (r2c8,r4c6,r7c9,r8c5), (r3c1) / (r5c1) => r5c5<>4
40. XY-Chain: 1 1- r7c3 -9- r1c3 -3- r1c5 -9- r2c6 -3- r2c8 -4- r3c9 -3- r8c9 -1 => r7c9,r8c23<>1
41. Row 8 / Column 3 → 8 (Naked Single)
42. Row 8 / Column 2 → 3 (Naked Single)
43. Row 8 / Column 9 → 1 (Naked Single)
44. Row 5 / Column 2 → 8 (Hidden Single)
45. XY-Chain: 1 1- r6c7 -4- r4c8 -8- r6c8 -3- r2c8 -4- r2c2 -9- r7c2 -1 => r6c2<>1
46. Row 6 / Column 7 → 1 (Hidden Single)
47. Row 7 / Column 2 → 1 (Hidden Single)
48. Row 7 / Column 3 → 9 (Naked Single)
49. Row 1 / Column 3 → 3 (Naked Single)
50. Row 1 / Column 5 → 9 (Full House)
51. Row 2 / Column 6 → 3 (Full House)
52. Row 8 / Column 5 → 4 (Naked Single)
53. Row 8 / Column 6 → 9 (Full House)
54. Row 2 / Column 8 → 4 (Naked Single)
55. Row 2 / Column 2 → 9 (Full House)
56. Row 3 / Column 9 → 3 (Full House)
57. Row 7 / Column 9 → 4 (Full House)
58. Row 7 / Column 7 → 3 (Full House)
59. Row 5 / Column 7 → 4 (Full House)
60. Row 6 / Column 6 → 8 (Naked Single)
61. Row 4 / Column 6 → 4 (Full House)
62. Row 4 / Column 8 → 8 (Full House)
63. Row 6 / Column 8 → 3 (Full House)
64. Row 6 / Column 5 → 7 (Naked Single)
65. Row 5 / Column 5 → 3 (Full House)
66. Row 6 / Column 2 → 4 (Full House)
67. Row 9 / Column 2 → 7 (Full House)
68. Row 9 / Column 3 → 4 (Full House)
69. Row 5 / Column 1 → 1 (Naked Single)
70. Row 3 / Column 1 → 4 (Full House)
71. Row 3 / Column 3 → 1 (Full House)
72. Row 5 / Column 3 → 7 (Full House)