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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.

9       4 15         10     12 5  
      2     11   6              
15       13 16         7     2 6  
      13     6         5   7 11 16
12         6 15   8           13 5
      15     7     10   2   9 4  
1 6         14   3 4     15 16    
    3   12 5 13                  
                  5 16 10   1    
    4 8     5 7   1         16 15
  10 15   11   16     3     4      
11 14           15   8 12         9
6 4 12   2         14     16      
  5 1     13         8 3       6
              14   12     2      
  9 16     1         4 15       11
Showing puzzle number: 2635
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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