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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.

5 3     13   12   10     1     2 11
          1   16       2       3
  10 6           15 9 12 11     8 1
          11   9 3       16 5    
            14             12   4
14     15 6 9 1   4 12     3      
9   3     2     6   11   1 15   14
  4 5 7           3 14   9     6
15     13   10 11           7 3 16  
3   4 11   5   6     2     1   8
      5     16 4   11 3 6 14     9
12   10             15            
    8 6       11 14   15          
1 13     2 14 4 7           10 3  
10       1       2   8          
4 11     8     10   1   12     14 13
Showing puzzle number: 1644
Puzzletype: Symmetrical Sudoku
Startnumbers: 102
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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