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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.

1090136 puzzles downloaded.

  15       3   10   6         4  
2 1     13 9 14     4       5 7 3
7 16 13     4 6           14   1  
      11     8 12 7 13            
  8   9 16           7   2   13 14
    1       15             6   12
      4               1        
5   15       9   2 10 11   1 16    
    7 3   6 16 14   8       12   4
        8               10      
14   2             9       11    
11 9   16   5           7 13   8  
            4 3 15 11     8      
  14   1           3 8     4 11 6
8 5 11       10     7 16 9     12 2
  4         5   1   6       16  
Showing puzzle number: 1573
Puzzletype: Symmetrical Sudoku
Startnumbers: 94
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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