Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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