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

This Sudoku Puzzle has 61 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, undefined, Hidden Rectangle, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 3 → 6 (Naked Single)
2. Row 5 / Column 7 → 7 (Full House)
3. Row 8 / Column 5 → 2 (Naked Single)
4. Row 9 / Column 5 → 6 (Naked Single)
5. Row 1 / Column 5 → 4 (Naked Single)
6. Row 2 / Column 5 → 5 (Full House)
7. Row 1 / Column 7 → 2 (Hidden Single)
8. Row 7 / Column 7 → 5 (Naked Single)
9. Row 9 / Column 7 → 8 (Naked Single)
10. Row 9 / Column 9 → 2 (Naked Single)
11. Row 7 / Column 9 → 7 (Naked Single)
12. Row 7 / Column 8 → 3 (Full House)
13. Row 6 / Column 6 → 2 (Hidden Single)
14. Row 4 / Column 4 → 4 (Hidden Single)
15. Row 3 / Column 8 → 4 (Hidden Single)
16. Row 9 / Column 3 → 4 (Hidden Single)
17. Row 3 / Column 2 → 7 (Hidden Single)
18. Row 7 / Column 3 → 2 (Hidden Single)
19. Row 3 / Column 9 → 5 (Hidden Single)
20. Row 7 / Column 2 → 6 (Hidden Single)
21. Row 8 / Column 2 → 8 (Hidden Single)
22. Locked Candidates Type 1 (Pointing): 1 in b1 => r3c7<>1
23. Locked Candidates Type 2 (Claiming): 1 in c2 => r4c3,r6c1<>1
24. Naked Triple: 1,6,9 in r137c1 => r8c1<>1
25. 2-String Kite: 8 in r2c9,r6c4 (connected by r4c9,r6c8) => r2c4<>8
26. XY-Wing: 1/8/6 in r4c69,r6c7 => r4c8,r6c4<>6
27. Row 6 / Column 4 → 8 (Naked Single)
28. Row 4 / Column 6 → 6 (Full House)
29. XY-Wing: 5/9/8 in r14c3,r4c8 => r1c8<>8
30. Row 1 / Column 3 → 8 (Hidden Single)
31. Row 3 / Column 6 → 8 (Hidden Single)
32. X-Wing: 9 r17 c14 => r2c4,r3c1<>9
33. Hidden Rectangle: 6/7 in r1c48,r2c48 => r1c8<>6
34. Row 1 / Column 8 → 7 (Naked Single)
35. Bivalue Universal Grave + 1 => r2c7<>1, r2c7<>9
36. Row 2 / Column 7 → 6 (Naked Single)
37. Row 2 / Column 4 → 7 (Naked Single)
38. Row 2 / Column 8 → 8 (Naked Single)
39. Row 3 / Column 7 → 9 (Naked Single)
40. Row 6 / Column 7 → 1 (Full House)
41. Row 2 / Column 9 → 1 (Full House)
42. Row 2 / Column 6 → 9 (Full House)
43. Row 4 / Column 9 → 8 (Full House)
44. Row 1 / Column 4 → 6 (Full House)
45. Row 1 / Column 1 → 9 (Full House)
46. Row 8 / Column 4 → 1 (Naked Single)
47. Row 7 / Column 4 → 9 (Full House)
48. Row 7 / Column 1 → 1 (Full House)
49. Row 4 / Column 8 → 5 (Naked Single)
50. Row 6 / Column 8 → 6 (Full House)
51. Row 3 / Column 3 → 1 (Naked Single)
52. Row 3 / Column 1 → 6 (Full House)
53. Row 6 / Column 2 → 3 (Naked Single)
54. Row 6 / Column 1 → 5 (Full House)
55. Row 8 / Column 1 → 3 (Full House)
56. Row 9 / Column 6 → 3 (Naked Single)
57. Row 9 / Column 2 → 9 (Full House)
58. Row 8 / Column 3 → 5 (Full House)
59. Row 4 / Column 3 → 9 (Full House)
60. Row 8 / Column 6 → 7 (Full House)
61. Row 4 / Column 2 → 1 (Full House)