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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.

1153565 puzzles downloaded.

      13           6     1   4  
4 16             7 10            
10       11 4         16 2        
3 15     13 6 8 7               16
      11 6 3       16 15 8   5    
  9   15   5   8 1   4       12  
13   8 7   14   2         6      
  4 16         15     2     9 8  
  6 4     15     2         12 16  
      10         16   14   4 3   6
  14       16   11 10   7   5   9  
    5   10 7 1       11 12 15      
7               11 2 10 14     6 9
        8 2         6 15       1
            11 1             13 14
  12   5     3           8      
Showing puzzle number: 311
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Very easy (0)
Solution methods: SiSo SC
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