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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.

803626 puzzles downloaded.

    2 12   7         9     16    
    14   10   13   4     8     2  
11   4 6       2     14 10        
      15 5 6         12         1
  4 6         12         5   1 3
              11 16   4   9     14
    15   4 8   7       1 6     11
1     14       6 7   3     8   4
7   5     12   9 3       2     13
6     3 7       12   15 16   4    
4     2   5   16 8              
12 9   11         2         14 8  
14         4         2 12 10      
        12 14     10       16 9   15
  1     2     13   16   11   6    
    11     3         7   13 1    
Showing puzzle number: 749
Puzzletype: Symmetrical Sudoku
Startnumbers: 94
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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