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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.

691295 puzzles downloaded.

            2 11 1     8        
    10 2 16   7         11 5     4
4 12 7 15 10     13 5   9 2 6   11 14
9     14 6         16            
  5       6 14   7   2     4   16
6       7     5 4       15 2 3 1
                    16          
        9 11       8           12
13           11       1 7        
          12                    
14 2 8 16       6 13     15       5
11   5     7   15   12 14       13  
            6         12 13     15
2 15   5 3 1   16 11     9 7 10 12 8
8     12 13         1   16 3 11    
        11     14 8 7            
Showing puzzle number: 3423
Puzzletype: Symmetrical Sudoku
Startnumbers: 94
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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