Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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