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

This Sudoku Puzzle has 54 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), undefined, Naked Single, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 9 → 1 (Hidden Single)
2. Locked Candidates Type 1 (Pointing): 2 in b2 => r1c2<>2
3. Locked Candidates Type 1 (Pointing): 4 in b2 => r1c9<>4
4. Locked Candidates Type 1 (Pointing): 4 in b8 => r7c13<>4
5. Locked Candidates Type 1 (Pointing): 4 in b9 => r3c7<>4
6. 2-String Kite: 6 in r4c2,r7c4 (connected by r7c1,r9c2) => r4c4<>6
7. W-Wing: 7/4 in r3c3,r9c7 connected by 4 in r8c37 => r3c7<>7
8. Row 3 / Column 7 → 3 (Naked Single)
9. Row 8 / Column 7 → 4 (Naked Single)
10. Row 9 / Column 7 → 7 (Full House)
11. Row 8 / Column 3 → 9 (Naked Single)
12. Row 7 / Column 3 → 2 (Naked Single)
13. Row 8 / Column 6 → 1 (Naked Single)
14. Row 8 / Column 8 → 3 (Full House)
15. Row 5 / Column 9 → 3 (Hidden Single)
16. Row 4 / Column 5 → 1 (Hidden Single)
17. Row 4 / Column 3 → 3 (Hidden Single)
18. Row 6 / Column 5 → 3 (Hidden Single)
19. XY-Wing: 2/6/9 in r49c6,r5c5 => r6c6,r7c5<>9
20. Row 7 / Column 5 → 4 (Naked Single)
21. Row 1 / Column 5 → 2 (Naked Single)
22. Row 5 / Column 5 → 9 (Full House)
23. Row 7 / Column 4 → 6 (Naked Single)
24. Row 9 / Column 6 → 9 (Full House)
25. Row 1 / Column 6 → 8 (Naked Single)
26. Row 1 / Column 4 → 4 (Full House)
27. Row 7 / Column 1 → 1 (Naked Single)
28. Row 7 / Column 8 → 9 (Full House)
29. Row 9 / Column 8 → 1 (Full House)
30. Row 6 / Column 6 → 6 (Naked Single)
31. Row 4 / Column 6 → 2 (Full House)
32. Row 6 / Column 1 → 9 (Hidden Single)
33. W-Wing: 7/5 in r4c4,r5c8 connected by 5 in r6c48 => r5c4<>7
34. XY-Wing: 6/7/8 in r49c2,r6c3 => r5c2,r9c3<>8
35. Row 9 / Column 3 → 4 (Naked Single)
36. Row 3 / Column 3 → 7 (Naked Single)
37. Row 3 / Column 9 → 4 (Full House)
38. Row 6 / Column 3 → 8 (Full House)
39. Row 9 / Column 1 → 6 (Naked Single)
40. Row 9 / Column 2 → 8 (Full House)
41. Row 1 / Column 2 → 9 (Naked Single)
42. Row 1 / Column 9 → 7 (Full House)
43. Row 2 / Column 9 → 9 (Full House)
44. Row 4 / Column 1 → 5 (Naked Single)
45. Row 2 / Column 2 → 2 (Naked Single)
46. Row 2 / Column 1 → 4 (Full House)
47. Row 5 / Column 1 → 2 (Full House)
48. Row 4 / Column 4 → 7 (Naked Single)
49. Row 4 / Column 2 → 6 (Full House)
50. Row 5 / Column 2 → 7 (Full House)
51. Row 6 / Column 4 → 5 (Naked Single)
52. Row 5 / Column 4 → 8 (Full House)
53. Row 5 / Column 8 → 5 (Full House)
54. Row 6 / Column 8 → 7 (Full House)