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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.

1152725 puzzles downloaded.

16     2       11 15   8     5    
    14       8 15 2   4     11   10
5       10 9     16       12 7 2  
1       6 2   4     10          
10   4             16   3 1 6   13
15 7   12       10       5        
9         14     11   7   15     12
      8   12   7   14         9 5
2 15         4   8   5   9      
7     6   8   9     16         11
        7       10       4   12 6
11   1 9 14   13             2   7
          13     6   1 15       8
  11 9 10       2     3 16       1
6   2     7   14 4 11       12    
    13     6   16 5       11     2
Showing puzzle number: 3291
Puzzletype: Symmetrical Sudoku
Startnumbers: 98
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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