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Sudoku puzzles diagonals (Su Doku)

My database includes 5816 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The diagonals must also contain 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

1067226 puzzles downloaded.

        3 15     5   4 11        
        9 11 4     8 15   14     6
3       8 2         10       15  
  9                     4   7  
  14     4     12     8 6 9 13    
        2     1 12         14 6  
            11 9         3   12 2
7   5 1       13   9 16       10  
  8       9 13   15       7 3   10
9 2   14         7 1            
  10 11         2 4     5        
    4 15 1 6     14     8     5  
  13   10                     16  
  5       12         2 15       4
12     16   14 15     3 5 10        
        13 10   8     7 4        
Showing puzzle number: 3999
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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