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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.

  4     13 6     5       16 15    
  6 12   7 5 10     8 3 4       9
                    11     13    
          8   4   6   15       7
5   8 11   2   6       3   7   14
2 1 15     10             6      
7             5 4     10   1   16
  13         1   6             2
13             2   11         10  
15   14   5     10 2             1
      6             14     16 12 8
1   7   9       15   8   13 14   5
14       6   2   11   1          
    4     12                    
6       14 4 16     10 12 5   2 8  
    10 13       3     4 8     14  
Showing puzzle number: 4450
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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