Langer's Sudoku Assistant

Invalid Sudoku!

Column 4 is invalid. The bottom center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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