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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.

591750 puzzles downloaded.

        2         8 9     12 7 6
  2 11 5 16       12 14         4  
  6     14   4       15 5 13      
      10   15   9 2       5      
      13       2           4   16
      4   7 13 3   2   16     15  
10 11       16     4   3 8        
      6 4 10         5       2  
  13       1         11 7 4      
        10 14   11     16       1 12
  10     12   2   14 13 4   16      
8   5           15       10      
      9       7 10   8   15      
      14 3 4       7   9     12  
  1         14 13       6 11 9 16  
2 4 6     9 10         13        
Showing puzzle number: 660
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Very easy (0)
Solution methods: SiSo SC
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