Langer's Sudoku Assistant

Invalid Sudoku!

Column 7 is invalid. Go back and make a different choice.

 

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

 

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