Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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