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

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



Score: 25

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