Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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