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Sudoku puzzles (Su Doku)

My database includes 242 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every box contains the digits 1 through 16. The grey boxes is even numbers and the white boxes is odd. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

182015 puzzles downloaded.

13     16       4       11        
    10           15     2 5      
          8   2         14      
  3     1 13                    
      7 10         3 1          
8   12   13 4           15   2    
            16     7            
      6 11         16         9  
  9         4         12 7      
            15     6            
    4   8           13 14   16   11
          12 5         10 13      
                    11 5     16  
      8         9   6          
      10 4     9           5    
        2       16       8     6
Showing puzzle number: 20
Puzzletype: Symmetrical Sudoku
Startnumbers: 60
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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