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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.

744151 puzzles downloaded.

        10       3 15         5 12
3     12     16         14 1     9
11 13   10   12   5     1   4     8
  15   1       9 16     11   7 14  
4 14       1       11 3     13   2
          10   11         3   4  
    9   15           13         14
  2     13         9         6  
  1         11         12     13  
8         6           5   16    
  11   14         13   8          
13   5     7 12       2       10 1
  10 14   5     12 4       11   1  
16     8   14     5   15   7   9 3
7     11 1         14     5     4
9 12         15 2       1        
Showing puzzle number: 844
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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