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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.

1066561 puzzles downloaded.

13         3     11         8 4 1
  10       8 1 7   16 12 13        
              13 14   3 5 15   12  
                  10 8         13
    10 2     16   13 5     6 11 15 3
16   12             15 4       10 9
      9 2 6       12     1      
15 6     3         1       16 5  
  13 6       3         12     9 16
      10     15       6 7 11      
9 11       13 10             12   15
8 12 1 16     11 14   3     5 10    
6         11 5                  
  3   4 9 14   6 10              
        4 15 7   5 6 9       3  
10 15 7         3     16         8
Showing puzzle number: 115
Puzzletype: Symmetrical Sudoku
Startnumbers: 96
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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