Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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