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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.

734790 puzzles downloaded.

        6         11   13 1 2 7  
11   5               15     13   8
      2 15       1 7 4   14      
    1 7   3 13 12           9 15  
8 2       10         5     7   15
      4 7 2 16 1             8  
      16 5 12         7         1
            15 4 16             9
1             2 6 15            
9         8         12 14 15      
  12             10 4 9 3 8      
14   6     7         16       2 4
  10 9           12 8 1   16 15    
      1   4 12 8       15 5      
16   15     5               4   6
  6 4 13 9   1         10        
Showing puzzle number: 1648
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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