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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.

605946 puzzles downloaded.

      6 4   8 1     7 3   9 2 14
              13     6   10 12    
  8   11     14           16 1    
    10   5         9   1        
  4           3     9   2     1
3 7       13 5             15 9 11
  13       6     5 7           16
    11 10     15   3 1   16     5  
  1     14   13 5   3     4 2    
15           6 12     4       13  
6 11 4             13 1       15 12
7     13   15     16           1  
        12   9         14   4    
    16 1           5     15   6  
    3 7   11     6              
13 14 6   15 8     11 2   10 12      
Showing puzzle number: 3470
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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