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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.

        8   4       2 1 6 16    
                          2    
      7 13   2     12   5 4   15  
10 3   2   15 14       13       11  
        12     13   6 3     8    
  13 6             16 12 9       7
8     10     5     11   13   14    
      3 4   6 14 7       2     13
13     1       15 16 4   11 5      
    9   5   13     1     7     16
2       14 16 9             3 10  
    14     6 7   5     8        
  10       4       5 1   9   2 8
  2   4 9   8     10   7 16      
    15                          
    12 8 15 14       9   6        
Showing puzzle number: 2197
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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