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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.

        6         13 5 9   12    
5     3     1       10 2 11      
14 6 13   5       4 1         15 2
    7     10 3                 14
8   11   3   14 6   2 16       5 4
    12 4     15               11  
        13   16     11   4     8  
        4     1   3   5 9      
      2 12   6   5     14        
  12     1   10     9   8        
  10               12     8 16    
11 3       5 8   2 4   6   15   1
7                 5 9     2    
10 9         5 15       11   14 3 12
      8 10 3       6     4     11
    2   16 13 11         7        
Showing puzzle number: 1601
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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