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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.

923690 puzzles downloaded.

      15       13 2 3         4  
1 16 8     11   9           6 15  
    13 11 2     12 14 16           9
    3   14   15   1         2    
2   10 4   13 9   3   14     11    
              15     7   1 3   6
        1             4 9   12 14
      16 11         1       7    
    9       1         5 13      
5 12   1 16             6        
3   11 7   2     16              
    16     9   5   11 2   10 4   15
    1         4   6   9   8    
16           7 11 15     2 6 9    
  5 2           8   1     13 11 7
  9         13 1 4       5      
Showing puzzle number: 5689
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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