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

This Sudoku Puzzle has 59 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Quadruple, Naked Single, Locked Candidates Type 2 (Claiming), Hidden Pair, Locked Pair, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 4 / Column 5 → 4 (Hidden Single)
2. Locked Candidates Type 1 (Pointing): 7 in b7 => r7c456<>7
3. Naked Quadruple: 1,5,8,9 in r7c456,r8c6 => r8c45<>1, r8c4<>5, r8c45<>8, r8c45<>9
4. Row 8 / Column 4 → 6 (Naked Single)
5. Row 8 / Column 5 → 6 (Naked Single)
6. Locked Candidates Type 2 (Claiming): 6 in r5 => r6c78<>6
7. Hidden Pair: 3,6 in r8c78 => r8c78<>1, r8c78<>4
8. Row 8 / Column 7 → 3 (Naked Single)
9. Row 8 / Column 8 → 3 (Naked Single)
10. Row 8 / Column 6 → 1 (Hidden Single)
11. Locked Pair: 4,6 in r23c7 => r23c8,r5c7<>6, r23c8,r7c7<>4
12. Row 2 / Column 8 → 5 (Naked Single)
13. Row 3 / Column 8 → 5 (Naked Single)
14. Row 5 / Column 8 → 6 (Hidden Single)
15. Row 7 / Column 8 → 4 (Hidden Single)
16. Row 7 / Column 7 → 1 (Hidden Single)
17. Locked Pair: 4,9 in r23c2 => r23c3,r45678c2<>9, r23c3,r8c2<>4
18. Row 2 / Column 3 → 6 (Naked Single)
19. Row 3 / Column 3 → 6 (Naked Single)
20. Row 2 / Column 7 → 4 (Naked Single)
21. Row 3 / Column 7 → 4 (Naked Single)
22. Row 2 / Column 2 → 9 (Naked Single)
23. Row 3 / Column 2 → 9 (Naked Single)
24. Row 8 / Column 3 → 4 (Hidden Single)
25. Row 8 / Column 2 → 5 (Hidden Single)
26. Row 7 / Column 3 → 9 (Hidden Single)
27. Row 7 / Column 5 → 8 (Naked Single)
28. Row 7 / Column 2 → 7 (Full House)
29. Row 7 / Column 4 → 5 (Full House)
30. Row 7 / Column 6 → 5 (Full House)
31. Row 3 / Column 5 → 1 (Naked Single)
32. Locked Candidates Type 2 (Claiming): 3 in r2 => r3c46<>3
33. Row 3 / Column 4 → 8 (Naked Single)
34. Row 3 / Column 6 → 8 (Naked Single)
35. Locked Candidates Type 2 (Claiming): 8 in c2 => r456c3<>8
36. Locked Candidates Type 2 (Claiming): 9 in c4 => r456c6,r56c5<>9
37. Locked Pair: 2,7 in r56c5 => r2c5,r456c6<>2, r2c5,r4c46,r5c46,r6c46<>7
38. Row 2 / Column 5 → 7 (Naked Single)
39. Row 4 / Column 6 → 7 (Naked Single)
40. Row 5 / Column 6 → 3 (Naked Single)
41. Row 6 / Column 6 → 3 (Naked Single)
42. Row 2 / Column 4 → 3 (Naked Single)
43. Row 5 / Column 5 → 2 (Naked Single)
44. Row 6 / Column 5 → 2 (Naked Single)
45. Row 4 / Column 3 → 2 (Naked Single)
46. Row 2 / Column 6 → 2 (Naked Single)
47. Row 5 / Column 3 → 7 (Naked Single)
48. Row 6 / Column 3 → 7 (Naked Single)
49. Row 4 / Column 8 → 1 (Naked Single)
50. Row 6 / Column 8 → 1 (Naked Single)
51. Row 4 / Column 2 → 8 (Naked Single)
52. Row 4 / Column 4 → 9 (Naked Single)
53. Row 6 / Column 2 → 8 (Naked Single)
54. Row 6 / Column 4 → 9 (Naked Single)
55. Row 4 / Column 7 → 9 (Naked Single)
56. Row 5 / Column 2 → 1 (Naked Single)
57. Row 5 / Column 4 → 1 (Naked Single)
58. Row 6 / Column 7 → 9 (Naked Single)
59. Row 5 / Column 7 → 8 (Naked Single)