Score: 24

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

Score: 24

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

Score: 25

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

Score: 25

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

Score: 25

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