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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.

837031 puzzles downloaded.

11 15 12   3 16 8 5   9 2         7
  2 1 8   11     13   12     4    
        4   14     1 5   2   15  
      13     1 7   6   3       14
  12 10 6       2 3   13       5  
  11 2         3     8     12 4  
      16 5 13 9       1   3      
  3             14     7     6  
  14     10     9             2  
      4   2       15 6 8 14      
  13 16     6     10         5 7  
  7       15   14 5       10 16 12  
12       8   11   1 16     5      
  8   15   1 6     10   12        
    13     7   10     14   4 6 16  
2         5 13   9 3 15 6   1 10 8
Showing puzzle number: 4587
Puzzletype: Symmetrical Sudoku
Startnumbers: 104
Difficulty: Super easy (0)
Solution methods: SiSo
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