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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.

588769 puzzles downloaded.

                8         1   2
                    5   14 6    
    7   4 13   11   12 10         9
5     13   3         9     15   7
11 15       2 4   5 1 8          
2       16     7 9 6         10 4
9           12 10           16 11 1
  12   6   15 8           9 7    
    2 5           7 3   1   12  
3 4 15           14 8           11
13 9         15 14 2     6       5
          9 6 3   5 12       16 15
7   13     6         11   2     16
15         16 10   1   13 5   11    
    11 2   4                    
1   5         15                
Showing puzzle number: 4821
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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