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

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, Swordfish, undefined, Hidden Rectangle, Continuous Nice Loop, Naked Pair, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 4 → 8 (Hidden Single)
2. Row 6 / Column 1 → 8 (Hidden Single)
3. Row 8 / Column 9 → 3 (Hidden Single)
4. Row 6 / Column 4 → 3 (Hidden Single)
5. Row 3 / Column 4 → 7 (Naked Single)
6. Row 2 / Column 4 → 6 (Naked Single)
7. Row 8 / Column 6 → 8 (Hidden Single)
8. Row 2 / Column 3 → 3 (Hidden Single)
9. Row 3 / Column 5 → 3 (Hidden Single)
10. Row 6 / Column 6 → 6 (Hidden Single)
11. Row 5 / Column 1 → 3 (Hidden Single)
12. Locked Candidates Type 1 (Pointing): 7 in b1 => r1c79<>7
13. Locked Candidates Type 1 (Pointing): 2 in b6 => r5c6<>2
14. Locked Candidates Type 2 (Claiming): 7 in r6 => r4c8,r5c79<>7
15. Row 7 / Column 7 → 7 (Hidden Single)
16. Row 8 / Column 5 → 7 (Hidden Single)
17. Hidden Pair: 6,7 in r1c13 => r1c1<>2, r1c1<>5, r1c3<>1
18. Swordfish: 4 r159 c379 => r47c3,r7c9<>4
19. XYZ-Wing: 1/5/9 in r26c2,r3c3 => r1c2<>1
20. Hidden Rectangle: 4/9 in r7c48,r8c48 => r7c4<>9
21. Finned X-Wing: 1 c57 r15 fr3c7 => r1c9<>1
22. Continuous Nice Loop: 4/5 9= r8c4 =2= r8c2 -2- r1c2 -5- r1c5 -1- r5c5 -9- r4c4 =9= r8c4 =2 => r8c4<>4, r1c79<>5
23. Row 7 / Column 4 → 4 (Hidden Single)
24. W-Wing: 1/5 in r2c6,r6c2 connected by 5 in r1c25 => r2c2<>1
25. Row 3 / Column 3 → 1 (Hidden Single)
26. X-Wing: 1 c57 r15 => r5c69<>1
27. Row 5 / Column 6 → 7 (Naked Single)
28. Naked Pair: 2,4 in r15c9 => r3c9<>2, r9c9<>4
29. XY-Wing: 2/5/4 in r1c9,r39c7 => r1c7<>4
30. Row 1 / Column 9 → 4 (Hidden Single)
31. Row 5 / Column 9 → 2 (Naked Single)
32. XY-Chain: 9 9- r4c4 -2- r8c4 -9- r8c8 -4- r9c7 -5- r3c7 -2- r1c7 -1- r5c7 -4- r5c3 -9 => r4c123,r5c5<>9
33. Row 4 / Column 3 → 7 (Naked Single)
34. Row 5 / Column 5 → 1 (Naked Single)
35. Row 1 / Column 3 → 6 (Naked Single)
36. Row 4 / Column 1 → 5 (Naked Single)
37. Row 1 / Column 5 → 5 (Naked Single)
38. Row 2 / Column 6 → 1 (Full House)
39. Row 4 / Column 6 → 2 (Naked Single)
40. Row 4 / Column 4 → 9 (Full House)
41. Row 7 / Column 6 → 5 (Full House)
42. Row 8 / Column 4 → 2 (Full House)
43. Row 5 / Column 7 → 4 (Naked Single)
44. Row 5 / Column 3 → 9 (Full House)
45. Row 1 / Column 1 → 7 (Naked Single)
46. Row 6 / Column 2 → 1 (Naked Single)
47. Row 4 / Column 2 → 4 (Full House)
48. Row 4 / Column 8 → 1 (Full House)
49. Row 1 / Column 2 → 2 (Naked Single)
50. Row 1 / Column 7 → 1 (Full House)
51. Row 9 / Column 7 → 5 (Naked Single)
52. Row 3 / Column 7 → 2 (Full House)
53. Row 7 / Column 3 → 8 (Naked Single)
54. Row 9 / Column 3 → 4 (Full House)
55. Row 8 / Column 2 → 9 (Naked Single)
56. Row 2 / Column 2 → 5 (Full House)
57. Row 3 / Column 1 → 9 (Full House)
58. Row 8 / Column 8 → 4 (Full House)
59. Row 3 / Column 9 → 5 (Full House)
60. Row 7 / Column 8 → 9 (Naked Single)
61. Row 9 / Column 1 → 6 (Naked Single)
62. Row 7 / Column 1 → 2 (Full House)
63. Row 6 / Column 9 → 7 (Naked Single)
64. Row 6 / Column 8 → 5 (Full House)
65. Row 2 / Column 8 → 7 (Full House)
66. Row 2 / Column 9 → 9 (Full House)
67. Row 7 / Column 5 → 6 (Naked Single)
68. Row 7 / Column 9 → 1 (Full House)
69. Row 9 / Column 9 → 8 (Full House)
70. Row 9 / Column 5 → 9 (Full House)