Langer's Sudoku Assistant

Invalid Sudoku!

Column 4 is invalid. Go back and make a different choice.

 

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

 

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