Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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