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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.

819923 puzzles downloaded.

      2             11 1       4
    6 14     1 8   10            
3           9 16 6   7     5    
13           4     12 9     1    
5   2           10 3 13   6 4   7
  1 7 4   3 11 12 5   6 2 15     9
10 11   16   5           9 1      
6 3     13       11   4     12 5  
  2 10     15   13       3     9 12
      6 14           12   4   7 1
15     5 1 8   11 7 4 16   3 13 14  
1   8 7   4 3 9           15   16
    5     10 13     7           14
    9     6   3 15 13           5
            8   2 6     9 3    
14       11 7             8      
Showing puzzle number: 3508
Puzzletype: Symmetrical Sudoku
Startnumbers: 104
Difficulty: Super easy (0)
Solution methods: SiSo
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