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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.

828989 puzzles downloaded.

9 5 13 14             4   8      
                              4
6     16 15 3 14         9 10      
        12 4 9 8     10   6 5 3  
  6 16         2                
  14         6   15         2    
15 7   1     12 11   10           5
12         1   14 13 3 16     6 11 8
16 15 1     6 8 3 10   2         14
7           2   1 13     12   16 15
    12         13   15         7  
                14         1 10  
  1 7 4   15     9 16 6 10        
      13 6         4 5 11 2     12
11                              
      6   2             13 10 14 1
Showing puzzle number: 3572
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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