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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.

1153565 puzzles downloaded.

  16 4 13 1       10 8 9     15    
                              16
  2         15 3 4     13 8     11
            14         1     10 4
      16 8 6   11 15   4       2  
    14     13   1     2   11   16  
15     7       14     12       8 10
    11       4       13 16 9     15
6     5 2 11       13       8    
14 12       5     2       16     6
  1   11   3     7   5     4    
  3       7   9 12   15 6 5      
8 10     4         12            
4     9 11     8 5 10         15  
11                              
    1     9 3 5       4 10 14 12  
Showing puzzle number: 2506
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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