Langer's Sudoku Assistant

Invalid Sudoku!

Column 3 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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