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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.

712511 puzzles downloaded.

      15 16 10   11   1            
2 12       14 8   10   7 3 9   4 13
11   8 3 6       14   13          
    1   9       12       7   5 15
    3       6   9     8 11 13    
6         5                 14  
  5     12 1   16         6      
10 16               15     3     4
15     8     12               2 10
      7         8   4 16     11  
  13                 2         16
    5 1 2     4   12       8    
3 8   13       14       12   10    
          3   8       5 12 4   6
5 1   6 4 12   9   8 16       15 2
            13   7   9 10 14      
Showing puzzle number: 2571
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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