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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.

712707 puzzles downloaded.

16     2   13   5   7 11 12 3      
    13 9   7 8     10   4   15 14  
  1 12 7     3 10     14     4    
          16           1     5  
  6 9   11           12         16
        12 14 6     9 7 13       5
  13       10   4             15 9
        3   15                  
                  11   14        
3 9             5   1       11  
15       13 2 5     16 10 8        
8         11           3   1 2  
  11     10           4          
    8     5     10 3     15 2 4  
  3 14   1   9     8 5   12 10    
      4 16 12 13   14   6   1     8
Showing puzzle number: 73
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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