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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.

1153565 puzzles downloaded.

10       6           2          
    9 1       14   11       5    
    16 7   13 12   1 3   15        
14     13         5 7     10      
8 15       2 1       3          
16 4         15   9   5          
9 11 3       5     15   4     2  
5 13     4         6 8 11     7  
  8     15 10 6         1     14 3
  16     5   14     8       1 13 10
          9   8   13         6 5
          1       2 9       8 4
      6     16 4         11     8
        8   11 6   1 14   5 9    
    15       3   10       4 2    
          5           16       15
Showing puzzle number: 1578
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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