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

This Sudoku Puzzle has 61 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Skyscraper, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

1. Row 2 / Column 2 → 5 (Hidden Single)
2. Locked Triple: 1,4,5 in r456c7 => r37c7,r46c8,r5c9<>4, r5c9,r7c7<>1, r46c8<>5
3. Row 5 / Column 9 → 3 (Naked Single)
4. Row 5 / Column 3 → 5 (Naked Single)
5. Locked Candidates Type 1 (Pointing): 2 in b4 => r3c3<>2
6. Locked Candidates Type 1 (Pointing): 2 in b6 => r78c8<>2
7. Locked Candidates Type 1 (Pointing): 7 in b6 => r2c8<>7
8. Naked Pair: 1,4 in r5c17 => r5c46<>1, r5c6<>4
9. X-Wing: 6 c37 r37 => r3c2568,r7c2458<>6
10. Skyscraper: 6 in r1c2,r2c5 (connected by r8c25) => r1c46<>6
11. Row 1 / Column 2 → 6 (Hidden Single)
12. Row 3 / Column 7 → 6 (Hidden Single)
13. Row 7 / Column 7 → 9 (Naked Single)
14. Row 7 / Column 3 → 6 (Hidden Single)
15. Row 3 / Column 2 → 8 (Hidden Single)
16. Row 3 / Column 8 → 4 (Naked Single)
17. Row 2 / Column 8 → 8 (Naked Single)
18. Row 2 / Column 9 → 7 (Naked Single)
19. Row 1 / Column 9 → 9 (Full House)
20. Row 7 / Column 8 → 3 (Naked Single)
21. Row 2 / Column 1 → 3 (Naked Single)
22. Row 2 / Column 4 → 6 (Naked Single)
23. Row 2 / Column 5 → 4 (Full House)
24. Row 3 / Column 3 → 9 (Naked Single)
25. Row 5 / Column 4 → 8 (Naked Single)
26. Row 3 / Column 1 → 2 (Naked Single)
27. Row 1 / Column 1 → 7 (Full House)
28. Row 6 / Column 3 → 2 (Naked Single)
29. Row 4 / Column 3 → 3 (Full House)
30. Row 1 / Column 4 → 2 (Naked Single)
31. Row 1 / Column 6 → 8 (Full House)
32. Row 5 / Column 6 → 6 (Naked Single)
33. Row 3 / Column 6 → 1 (Naked Single)
34. Row 3 / Column 5 → 3 (Full House)
35. Row 6 / Column 8 → 7 (Naked Single)
36. Row 7 / Column 4 → 1 (Naked Single)
37. Row 9 / Column 6 → 5 (Naked Single)
38. Row 4 / Column 8 → 2 (Naked Single)
39. Row 6 / Column 5 → 1 (Naked Single)
40. Row 6 / Column 4 → 5 (Naked Single)
41. Row 9 / Column 4 → 3 (Full House)
42. Row 7 / Column 2 → 4 (Naked Single)
43. Row 7 / Column 5 → 8 (Naked Single)
44. Row 7 / Column 9 → 2 (Full House)
45. Row 8 / Column 5 → 6 (Naked Single)
46. Row 8 / Column 6 → 2 (Full House)
47. Row 4 / Column 6 → 4 (Full House)
48. Row 4 / Column 5 → 7 (Full House)
49. Row 9 / Column 8 → 6 (Naked Single)
50. Row 8 / Column 8 → 5 (Full House)
51. Row 6 / Column 7 → 4 (Naked Single)
52. Row 6 / Column 2 → 9 (Full House)
53. Row 4 / Column 2 → 1 (Naked Single)
54. Row 4 / Column 7 → 5 (Full House)
55. Row 5 / Column 7 → 1 (Full House)
56. Row 5 / Column 1 → 4 (Full House)
57. Row 8 / Column 2 → 3 (Full House)
58. Row 9 / Column 1 → 1 (Naked Single)
59. Row 8 / Column 1 → 9 (Full House)
60. Row 8 / Column 9 → 1 (Full House)
61. Row 9 / Column 9 → 4 (Full House)