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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.

633174 puzzles downloaded.

              15         6   8  
6         1 11   8     3     14  
8 2 11 14 12   10   9   15   13      
12         14       6   1       7
    1                 15 10 14    
5   8       4     12     3 1 16  
  12     5 10 8 9 14           7  
11 9                 7 4 12      
      12 9 15                 6 5
  16           4 15 2 5 10     12  
  7 5 15     3     16       9   2
    3 11 16                 10    
15       7   2       4         16
      16   12   14   10   11 7 5 3 1
  11     8     10   5 1         15
  1   9         12              
Showing puzzle number: 4405
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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