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

This Sudoku Puzzle has 77 steps and it is solved using Hidden Single, Locked Candidates Type 2 (Claiming), undefined, Discontinuous Nice Loop, Naked Single, Locked Candidates Type 1 (Pointing), Naked Triple, Empty Rectangle, Sue de Coq, Full House, Hidden Rectangle techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 2 → 7 (Hidden Single)
2. Row 6 / Column 4 → 7 (Hidden Single)
3. Row 8 / Column 4 → 2 (Hidden Single)
4. Row 2 / Column 8 → 8 (Hidden Single)
5. Row 8 / Column 3 → 7 (Hidden Single)
6. Locked Candidates Type 2 (Claiming): 6 in r2 => r3c4<>6
7. X-Wing: 3 r68 c16 => r2479c6,r79c1<>3
8. 2-String Kite: 5 in r5c9,r8c6 (connected by r7c9,r8c8) => r5c6<>5
9. Discontinuous Nice Loop: 1/3/9 r1c9 =2= r1c7 -2- r4c7 -4- r6c8 =4= r6c6 =3= r8c6 =5= r8c8 -5- r4c8 =5= r5c9 =2= r1c9 => r1c9<>1, r1c9<>3, r1c9<>9
10. Row 1 / Column 9 → 2 (Naked Single)
11. Discontinuous Nice Loop: 1/6/8/9 r5c1 =2= r5c7 =7= r5c9 =5= r7c9 -5- r8c8 =5= r8c6 =3= r6c6 =4= r6c8 -4- r4c7 -2- r4c2 =2= r5c1 => r5c1<>1, r5c1<>6, r5c1<>8, r5c1<>9
12. Row 5 / Column 1 → 2 (Naked Single)
13. Row 5 / Column 7 → 7 (Naked Single)
14. Row 5 / Column 3 → 6 (Hidden Single)
15. Row 4 / Column 7 → 2 (Hidden Single)
16. Row 7 / Column 2 → 2 (Hidden Single)
17. Row 5 / Column 6 → 8 (Hidden Single)
18. Row 6 / Column 2 → 8 (Hidden Single)
19. Locked Candidates Type 1 (Pointing): 1 in b4 => r4c46<>1
20. Locked Candidates Type 1 (Pointing): 4 in b6 => r1c8<>4
21. Naked Triple: 1,6,9 in r1c238 => r1c15<>1, r1c17<>6, r1c15<>9
22. Row 1 / Column 1 → 5 (Naked Single)
23. Empty Rectangle: 9 in b2 (r5c59) => r2c9<>9
24. Locked Candidates Type 2 (Claiming): 9 in r2 => r3c5<>9
25. XY-Wing: 5/9/1 in r35c9,r5c4 => r3c4<>1
26. Sue de Coq: r789c1 - {13689} (r6c1 - {39}, r8c2 - {16}) => r79c3<>1, r3c1,r79c3<>8, r3c1<>9
27. Row 3 / Column 3 → 8 (Hidden Single)
28. Row 3 / Column 9 → 9 (Hidden Single)
29. Row 5 / Column 9 → 5 (Naked Single)
30. Row 5 / Column 4 → 1 (Naked Single)
31. Row 5 / Column 5 → 9 (Full House)
32. Row 2 / Column 6 → 9 (Hidden Single)
33. Row 2 / Column 4 → 6 (Hidden Single)
34. Locked Candidates Type 1 (Pointing): 1 in b2 => r79c5<>1
35. Locked Candidates Type 1 (Pointing): 3 in b2 => r79c5<>3
36. W-Wing: 4/3 in r6c6,r7c3 connected by 3 in r4c34 => r7c6<>4
37. W-Wing: 4/3 in r7c3,r9c4 connected by 3 in r4c34 => r7c5,r9c3<>4
38. Row 7 / Column 3 → 4 (Hidden Single)
39. Locked Candidates Type 2 (Claiming): 3 in r7 => r9c79<>3
40. Hidden Rectangle: 6/8 in r7c17,r9c17 => r7c1<>6
41. XY-Chain: 1 1- r1c8 -6- r3c7 -4- r1c7 -3- r1c5 -4- r9c5 -7- r9c9 -1 => r2c9,r78c8<>1
42. Row 2 / Column 9 → 3 (Naked Single)
43. Row 2 / Column 5 → 1 (Full House)
44. Row 1 / Column 7 → 4 (Naked Single)
45. Row 1 / Column 5 → 3 (Naked Single)
46. Row 3 / Column 7 → 6 (Naked Single)
47. Row 1 / Column 8 → 1 (Full House)
48. Row 3 / Column 1 → 1 (Naked Single)
49. Row 9 / Column 7 → 8 (Naked Single)
50. Row 7 / Column 7 → 3 (Full House)
51. Row 1 / Column 3 → 9 (Naked Single)
52. Row 1 / Column 2 → 6 (Full House)
53. Row 7 / Column 1 → 8 (Naked Single)
54. Row 9 / Column 3 → 3 (Naked Single)
55. Row 4 / Column 3 → 1 (Full House)
56. Row 8 / Column 2 → 1 (Naked Single)
57. Row 4 / Column 2 → 9 (Full House)
58. Row 6 / Column 1 → 3 (Full House)
59. Row 8 / Column 1 → 6 (Naked Single)
60. Row 9 / Column 1 → 9 (Full House)
61. Row 9 / Column 4 → 4 (Naked Single)
62. Row 4 / Column 8 → 4 (Naked Single)
63. Row 6 / Column 8 → 9 (Full House)
64. Row 6 / Column 6 → 4 (Full House)
65. Row 8 / Column 8 → 5 (Naked Single)
66. Row 7 / Column 8 → 6 (Full House)
67. Row 8 / Column 6 → 3 (Full House)
68. Row 3 / Column 4 → 5 (Naked Single)
69. Row 3 / Column 5 → 4 (Full House)
70. Row 4 / Column 4 → 3 (Full House)
71. Row 4 / Column 6 → 5 (Full House)
72. Row 9 / Column 5 → 7 (Naked Single)
73. Row 7 / Column 5 → 5 (Full House)
74. Row 7 / Column 6 → 1 (Naked Single)
75. Row 7 / Column 9 → 7 (Full House)
76. Row 9 / Column 9 → 1 (Full House)
77. Row 9 / Column 6 → 6 (Full House)