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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.

1110379 puzzles downloaded.

4 10     2   13   6 8 12 16     15  
    9       4 12         7   2  
6 15   2       10                
  11   16   15 8         1        
11     14         13 2            
13 3 1       7   4     11        
9   6   5   10 1   12       3   11
          6   3   1   9        
        14   2   5   1          
14   8       16   9 11   10   13   5
        6     5   3       15 4 14
            1 8         11     10
        4         16 14   15   5  
                2       8   11 16
  13   9         1 7       4    
  2     15 9 12 16   4   5     14 1
Showing puzzle number: 4309
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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