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

This Sudoku Puzzle has 55 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Remote Pair, Skyscraper, undefined, Uniqueness Test 3, Full House, Bivalue Universal Grave + 1, Give Up techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 8 / Column 1 → 2 (Naked Single)
2. Row 8 / Column 9 → 4 (Naked Single)
3. Row 8 / Column 3 → 8 (Naked Single)
4. Row 1 / Column 4 → 8 (Hidden Single)
5. Row 5 / Column 4 → 4 (Hidden Single)
6. Row 5 / Column 3 → 3 (Hidden Single)
7. Row 5 / Column 8 → 9 (Naked Single)
8. Row 3 / Column 8 → 6 (Naked Single)
9. Row 4 / Column 8 → 5 (Naked Single)
10. Row 9 / Column 2 → 6 (Hidden Single)
11. Row 7 / Column 6 → 2 (Hidden Single)
12. Row 5 / Column 9 → 2 (Hidden Single)
13. Row 1 / Column 8 → 4 (Hidden Single)
14. Row 3 / Column 2 → 8 (Hidden Single)
15. Row 9 / Column 6 → 8 (Hidden Single)
16. Row 3 / Column 3 → 7 (Hidden Single)
17. Row 1 / Column 5 → 6 (Hidden Single)
18. Row 6 / Column 2 → 5 (Hidden Single)
19. Locked Candidates Type 1 (Pointing): 3 in b2 => r2c7<>3
20. Locked Candidates Type 1 (Pointing): 9 in b4 => r4c4<>9
21. Locked Candidates Type 1 (Pointing): 3 in b9 => r7c5<>3
22. Locked Candidates Type 2 (Claiming): 9 in c5 => r2c46,r3c4<>9
23. Remote Pair: 1/4 r2c3 -4- r9c3 -1- r7c2 -4- r7c5 => r2c5<>1
24. Skyscraper: 1 in r1c9,r2c6 (connected by r6c69) => r2c7<>1
25. 2-String Kite: 1 in r1c1,r5c7 (connected by r4c1,r5c2) => r1c7<>1
26. Uniqueness Test 3: 3/8 in r6c78,r7c78 => r1c7<>9
27. Row 1 / Column 7 → 3 (Naked Single)
28. Row 1 / Column 9 → 1 (Naked Single)
29. Row 1 / Column 1 → 9 (Full House)
30. Row 4 / Column 1 → 1 (Full House)
31. Row 4 / Column 4 → 7 (Naked Single)
32. Row 4 / Column 2 → 9 (Full House)
33. Row 5 / Column 2 → 7 (Full House)
34. Row 5 / Column 7 → 1 (Full House)
35. Locked Candidates Type 1 (Pointing): 1 in b1 => r2c46<>1
36. Row 2 / Column 6 → 5 (Naked Single)
37. Row 8 / Column 6 → 9 (Naked Single)
38. Row 6 / Column 6 → 1 (Full House)
39. Row 8 / Column 4 → 5 (Full House)
40. Row 6 / Column 4 → 9 (Full House)
41. Bivalue Universal Grave + 1 => r9c5<>3, r9c5<>4
42. Row 9 / Column 5 → 1 (Naked Single)
43. Row 3 / Column 5 → 9 (Naked Single)
44. Row 7 / Column 5 → 4 (Naked Single)
45. Row 9 / Column 4 → 3 (Full House)
46. Row 9 / Column 3 → 4 (Full House)
47. Row 2 / Column 5 → 3 (Full House)
48. Row 7 / Column 2 → 1 (Full House)
49. Row 2 / Column 3 → 1 (Full House)
50. Row 2 / Column 2 → 4 (Full House)
51. Row 3 / Column 7 → 2 (Naked Single)
52. Row 2 / Column 7 → 9 (Full House)
53. Row 2 / Column 4 → 2 (Full House)
54. Row 3 / Column 4 → 1 (Full House)
55. Give Up: Don't know how to proceed!