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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.

1005028 puzzles downloaded.

          13 14   12     16   1    
7   6             4           12
      15 4 6     13   11     8   2
                8 14     9 4    
      10 16 5   14 6   3 13 11   8  
  1       15     7 5       3   14
                      2 16   1 5
  14   16 13     1           15    
    11           5     15 8   4  
4 16   12 9                      
8   14       10 6     12       2  
  10   3 15 11   8 9   2 4 12      
    8 2     11 16                
11   1     10   4     14 7 5      
6           9             2   8
    13   8     7   2 5          
Showing puzzle number: 2531
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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