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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.

1088256 puzzles downloaded.

15           6     5     13      
16     12 8   11 10   4     7      
5     11 7     4 12 16   6     15  
10 9             1 11   7 5 3    
    9     6           3   14    
6     5 3         12 1   4   7 16
      7   10   12           15    
  1           5               10
13               4           14  
    15           8   2   3      
12 16   3   8 4         11 1     9
    6   12           15     2    
    13 14 2   15 16             6 8
  6     4   14 8 9     1 11     13
      9     10   13 8   16 14     3
      10     1     14           7
Showing puzzle number: 2568
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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