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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.

1064803 puzzles downloaded.

    5 13 11 7   6 1 10     8      
  7   4       2 5 12 15 3     1  
1     16         8         10 13 2
    12       1                  
              10 16   9     14 7 13
    8               5 10     12 6
    6     9   16 12   3   15 2    
      1 13   11     2 6 4     8  
  1     16 8 9     11   12 5      
    9 12   11   7 15   2     13    
7 10     1 3               4    
16 5 4     15   14 7              
                  1       5    
5 2 15         1         6     3
  6     14 13 3 5 10       2   9  
      7     16 8 3   14 6 13 11    
Showing puzzle number: 1639
Puzzletype: Symmetrical Sudoku
Startnumbers: 98
Difficulty: Very easy (0)
Solution methods: SiSo SC
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