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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.

629679 puzzles downloaded.

8 5 4   7       9 2   13        
    16     2   1       14 7      
    11 12     9 10     16     14 4  
  13       8 4   15 6 3 12   5 11  
15   9             1 13          
5                     11        
3       11   13 5 14     6   2   9
      13   14     5           16 15
14 6           8     4   10      
11   3   10     13 6 9   15       14
        2                     1
          9 15             7   5
  7 5   13 10 14 6   8 9       15  
  11 1     5     7 10     3 6    
      3 1       12   6     10    
        12   16 3       1   8 7 4
Showing puzzle number: 434
Puzzletype: Symmetrical Sudoku
Startnumbers: 94
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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