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

This Sudoku Puzzle has 31 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Uniqueness Test 4, Discontinuous Nice Loop, Give Up techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 4 / Column 3 → 1 (Naked Single)
2. Row 2 / Column 4 → 3 (Naked Single)
3. Row 5 / Column 5 → 3 (Naked Single)
4. Row 5 / Column 6 → 9 (Naked Single)
5. Row 6 / Column 5 → 2 (Full House)
6. Row 2 / Column 6 → 4 (Naked Single)
7. Row 8 / Column 6 → 2 (Full House)
8. Row 4 / Column 2 → 4 (Naked Single)
9. Row 9 / Column 3 → 3 (Naked Single)
10. Row 4 / Column 7 → 2 (Naked Single)
11. Row 4 / Column 8 → 9 (Full House)
12. Row 6 / Column 2 → 7 (Naked Single)
13. Row 9 / Column 2 → 1 (Naked Single)
14. Row 7 / Column 2 → 8 (Naked Single)
15. Row 1 / Column 2 → 3 (Full House)
16. Row 7 / Column 1 → 9 (Full House)
17. Row 9 / Column 4 → 5 (Naked Single)
18. Row 3 / Column 4 → 1 (Naked Single)
19. Row 8 / Column 4 → 9 (Full House)
20. Row 8 / Column 5 → 1 (Naked Single)
21. Row 9 / Column 5 → 4 (Full House)
22. Row 9 / Column 8 → 7 (Full House)
23. Row 2 / Column 7 → 7 (Hidden Single)
24. Row 3 / Column 3 → 2 (Hidden Single)
25. Row 7 / Column 9 → 2 (Hidden Single)
26. Row 1 / Column 1 → 1 (Hidden Single)
27. Locked Candidates Type 1 (Pointing): 6 in b4 => r5c78<>6
28. Uniqueness Test 4: 5/8 in r1c57,r3c57 => r13c7<>5
29. Discontinuous Nice Loop: 3 r6c7 -3- r8c7 -5- r8c9 =5= r3c9 -5- r1c8 -6- r1c7 =6= r6c7 => r6c7<>3
30. Discontinuous Nice Loop: 4 r6c8 -4- r7c8 -1- r7c7 =1= r5c7 =5= r8c7 =3= r8c9 -3- r6c9 =3= r6c8 => r6c8<>4
31. Give Up: Don't know how to proceed!