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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.

923027 puzzles downloaded.

  7     10 11 15             2    
          13 14   8 7     3     11
    1       9 4       11 6      
3     9 7 12   16   2   10     5  
13   9   12   11 2                
    14       5   2   4          
2   12   4         15 1       3 8
      11 16   13 8   10         1  
  4         2   15 11   7 12      
8 1       5 3         12   11   9
          6   1   8       7    
                10 1   2   6   4
  13     2   8   4   10 5 16     12
      3 6       7 16       13    
9     6     12 7   14 2          
    4             13 15 6     2  
Showing puzzle number: 1855
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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