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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.

578418 puzzles downloaded.

  12       15   14 16         9    
    1           7     4   15   5
      6     8         5 12      
15 5   2   10               7 13 11
14           6   10   16 7   5    
  13       3   11       6   12 1  
  4       2 1 16 8     11 10 14 6  
  16       12     13       2      
      1       2     3       12  
  8 9 4 3     12 5 11 7       10  
  2 6   10       9   15       7  
    7   8 11   6   16           14
1 15 14               8   5   9 7
      3 7         5     8      
2   8   4     1           13    
    5         3 15   2       4  
Showing puzzle number: 1996
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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