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

This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Skyscraper, Naked Pair, undefined, Uniqueness Test 4, Hidden Rectangle, Locked Candidates Type 2 (Claiming), Uniqueness Test 6 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 3 → 9 (Naked Single)
2. Row 3 / Column 4 → 9 (Hidden Single)
3. Row 5 / Column 2 → 1 (Hidden Single)
4. Row 5 / Column 1 → 3 (Naked Single)
5. Row 8 / Column 9 → 1 (Hidden Single)
6. Row 7 / Column 3 → 6 (Hidden Single)
7. Row 8 / Column 1 → 9 (Hidden Single)
8. Row 3 / Column 5 → 6 (Hidden Single)
9. Row 4 / Column 2 → 7 (Hidden Single)
10. Row 4 / Column 5 → 3 (Naked Single)
11. Row 9 / Column 5 → 5 (Naked Single)
12. Row 9 / Column 2 → 2 (Naked Single)
13. Row 7 / Column 1 → 5 (Naked Single)
14. Row 6 / Column 1 → 2 (Naked Single)
15. Row 6 / Column 3 → 5 (Full House)
16. Row 7 / Column 2 → 8 (Naked Single)
17. Row 8 / Column 2 → 4 (Full House)
18. Row 2 / Column 2 → 5 (Full House)
19. Row 3 / Column 1 → 1 (Hidden Single)
20. Row 1 / Column 1 → 4 (Full House)
21. Row 4 / Column 4 → 2 (Hidden Single)
22. Row 2 / Column 4 → 4 (Hidden Single)
23. Row 1 / Column 6 → 5 (Hidden Single)
24. Row 5 / Column 6 → 6 (Hidden Single)
25. Locked Candidates Type 1 (Pointing): 2 in b9 => r3c8<>2
26. Skyscraper: 8 in r2c6,r5c5 (connected by r25c9) => r1c5,r6c6<>8
27. Row 1 / Column 5 → 1 (Naked Single)
28. Row 6 / Column 6 → 1 (Naked Single)
29. Row 7 / Column 4 → 1 (Hidden Single)
30. Locked Candidates Type 1 (Pointing): 7 in b8 => r8c78<>7
31. Naked Pair: 5,6 in r48c7 => r3c7<>5, r9c7<>6
32. 2-String Kite: 3 in r2c9,r9c4 (connected by r1c4,r2c6) => r9c9<>3
33. Uniqueness Test 4: 2/8 in r1c39,r3c39 => r13c9<>8
34. Hidden Rectangle: 3/9 in r6c79,r9c79 => r6c9<>3
35. Locked Candidates Type 2 (Claiming): 3 in c9 => r1c7<>3
36. Hidden Rectangle: 3/7 in r6c78,r7c78 => r6c8<>7
37. XY-Chain: 7 7- r5c8 -4- r3c8 -5- r8c8 -2- r8c6 -8- r2c6 -3- r2c9 -8- r5c9 -7 => r5c5,r6c79<>7
38. Uniqueness Test 6: 7/8 in r6c45,r8c45 => r6c5,r8c4<>7
39. Row 6 / Column 4 → 7 (Hidden Single)
40. Row 8 / Column 5 → 7 (Hidden Single)
41. XY-Chain: 4 4- r5c8 -7- r5c9 -8- r2c9 -3- r2c6 -8- r1c4 -3- r9c4 -6- r9c9 -9- r6c9 -8- r6c5 -4 => r5c5,r6c78<>4
42. Row 5 / Column 5 → 8 (Naked Single)
43. Row 6 / Column 5 → 4 (Full House)
44. Row 6 / Column 8 → 3 (Naked Single)
45. Row 5 / Column 9 → 7 (Naked Single)
46. Row 5 / Column 8 → 4 (Full House)
47. Row 3 / Column 8 → 5 (Naked Single)
48. Row 3 / Column 9 → 2 (Naked Single)
49. Row 8 / Column 8 → 2 (Naked Single)
50. Row 7 / Column 8 → 7 (Full House)
51. Row 1 / Column 9 → 3 (Naked Single)
52. Row 3 / Column 3 → 8 (Naked Single)
53. Row 1 / Column 3 → 2 (Full House)
54. Row 3 / Column 7 → 4 (Full House)
55. Row 8 / Column 6 → 8 (Naked Single)
56. Row 7 / Column 7 → 3 (Naked Single)
57. Row 7 / Column 6 → 2 (Full House)
58. Row 2 / Column 6 → 3 (Full House)
59. Row 1 / Column 4 → 8 (Full House)
60. Row 2 / Column 9 → 8 (Full House)
61. Row 1 / Column 7 → 7 (Full House)
62. Row 8 / Column 4 → 6 (Naked Single)
63. Row 8 / Column 7 → 5 (Full House)
64. Row 9 / Column 4 → 3 (Full House)
65. Row 9 / Column 7 → 9 (Naked Single)
66. Row 9 / Column 9 → 6 (Full House)
67. Row 6 / Column 9 → 9 (Naked Single)
68. Row 6 / Column 7 → 8 (Full House)
69. Row 4 / Column 7 → 6 (Full House)
70. Row 4 / Column 9 → 5 (Full House)