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

This Sudoku Puzzle has 77 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Locked Pair, Hidden Pair, Continuous Nice Loop, undefined, Discontinuous Nice Loop, Naked Triple, Skyscraper, Locked Candidates Type 2 (Claiming), Bivalue Universal Grave + 1, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 8 / Column 1 → 3 (Hidden Single)
2. Row 9 / Column 6 → 3 (Hidden Single)
3. Row 2 / Column 9 → 6 (Hidden Single)
4. Row 8 / Column 5 → 7 (Hidden Single)
5. Row 6 / Column 6 → 7 (Hidden Single)
6. Locked Candidates Type 1 (Pointing): 4 in b1 => r2c56<>4
7. Row 2 / Column 5 → 5 (Naked Single)
8. Row 2 / Column 6 → 1 (Naked Single)
9. Locked Pair: 4,6 in r3c56 => r1c6,r3c2<>6, r3c4<>4
10. Row 1 / Column 6 → 8 (Naked Single)
11. Row 7 / Column 4 → 8 (Hidden Single)
12. Row 5 / Column 5 → 8 (Hidden Single)
13. Hidden Pair: 4,9 in r79c8 => r7c8<>1, r79c8<>5
14. Continuous Nice Loop: 1/2/5/6/7 7= r2c7 =3= r2c8 -3- r5c8 =3= r5c2 =6= r5c6 =5= r7c6 =4= r7c8 =9= r7c2 =7= r7c1 -7- r2c1 =7= r2c7 =3 => r57c2<>1, r2c7,r5c2<>2, r57c2<>5, r7c2<>6, r1c1<>7
15. Locked Candidates Type 1 (Pointing): 2 in b4 => r6c79<>2
16. Locked Candidates Type 1 (Pointing): 1 in b7 => r46c3<>1
17. Continuous Nice Loop: 5/6 3= r4c2 =1= r6c2 =2= r6c3 -2- r2c3 =2= r2c8 =3= r2c7 -3- r4c7 =3= r4c2 =1 => r46c2<>5, r4c2<>6
18. XY-Chain: 1 1- r4c2 -3- r5c2 -6- r5c6 -5- r5c4 -1 => r4c4<>1
19. Row 5 / Column 4 → 1 (Hidden Single)
20. Row 1 / Column 8 → 1 (Hidden Single)
21. Discontinuous Nice Loop: 2 r1c2 -2- r1c4 -7- r1c7 =7= r2c7 =3= r2c8 =2= r2c3 -2- r1c2 => r1c2<>2
22. Discontinuous Nice Loop: 4 r4c1 -4- r4c4 -5- r5c6 -6- r5c2 -3- r5c8 =3= r4c7 =8= r4c1 => r4c1<>4
23. Discontinuous Nice Loop: 5/6 r4c1 =8= r4c7 =3= r2c7 =7= r2c1 =4= r6c1 =8= r4c1 => r4c1<>5, r4c1<>6
24. Row 4 / Column 1 → 8 (Naked Single)
25. Row 6 / Column 7 → 8 (Hidden Single)
26. XYZ-Wing: 2/4/5 in r26c3,r6c1 => r4c3<>4
27. Locked Candidates Type 1 (Pointing): 4 in b4 => r6c5<>4
28. Row 6 / Column 5 → 9 (Naked Single)
29. Row 4 / Column 9 → 9 (Hidden Single)
30. Naked Triple: 4,5,6 in r4c345 => r4c7<>5
31. Naked Triple: 1,5,6 in r478c3 => r6c3<>5
32. 2-String Kite: 5 in r4c3,r7c6 (connected by r4c4,r5c6) => r7c3<>5
33. Skyscraper: 5 in r8c3,r9c4 (connected by r4c34) => r9c2<>5
34. Locked Candidates Type 2 (Claiming): 5 in c2 => r1c1<>5
35. Row 1 / Column 1 → 6 (Naked Single)
36. Hidden Pair: 1,6 in r7c37 => r7c7<>5
37. 2-String Kite: 5 in r6c9,r8c3 (connected by r4c3,r6c1) => r8c9<>5
38. Locked Candidates Type 1 (Pointing): 5 in b9 => r1c7<>5
39. Row 1 / Column 2 → 5 (Hidden Single)
40. Row 3 / Column 8 → 5 (Hidden Single)
41. Bivalue Universal Grave + 1 => r8c7<>2, r8c7<>5
42. Row 8 / Column 7 → 1 (Naked Single)
43. Row 4 / Column 7 → 3 (Naked Single)
44. Row 7 / Column 7 → 6 (Naked Single)
45. Row 8 / Column 3 → 5 (Naked Single)
46. Row 8 / Column 9 → 2 (Full House)
47. Row 2 / Column 7 → 7 (Naked Single)
48. Row 4 / Column 2 → 1 (Naked Single)
49. Row 5 / Column 8 → 2 (Naked Single)
50. Row 7 / Column 3 → 1 (Naked Single)
51. Row 9 / Column 7 → 5 (Naked Single)
52. Row 1 / Column 7 → 2 (Full House)
53. Row 2 / Column 8 → 3 (Full House)
54. Row 1 / Column 4 → 7 (Full House)
55. Row 4 / Column 3 → 6 (Naked Single)
56. Row 7 / Column 1 → 7 (Naked Single)
57. Row 5 / Column 9 → 5 (Naked Single)
58. Row 6 / Column 9 → 1 (Full House)
59. Row 2 / Column 1 → 4 (Naked Single)
60. Row 2 / Column 3 → 2 (Full House)
61. Row 6 / Column 1 → 5 (Full House)
62. Row 3 / Column 2 → 7 (Full House)
63. Row 6 / Column 3 → 4 (Full House)
64. Row 6 / Column 2 → 2 (Full House)
65. Row 5 / Column 2 → 3 (Full House)
66. Row 5 / Column 6 → 6 (Full House)
67. Row 9 / Column 4 → 4 (Naked Single)
68. Row 7 / Column 6 → 5 (Full House)
69. Row 3 / Column 6 → 4 (Full House)
70. Row 3 / Column 4 → 2 (Naked Single)
71. Row 4 / Column 4 → 5 (Full House)
72. Row 4 / Column 5 → 4 (Full House)
73. Row 3 / Column 5 → 6 (Full House)
74. Row 7 / Column 2 → 9 (Naked Single)
75. Row 7 / Column 8 → 4 (Full House)
76. Row 9 / Column 8 → 9 (Full House)
77. Row 9 / Column 2 → 6 (Full House)