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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 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 cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

280517 puzzles downloaded.

  6           11 15 12         3 10
    5 9           11   10   12    
3 12 7     15               8 11  
      15 10   16   8             9
    10   11         3       5    
    6           13     7        
  5 14   15             1        
  15   3         14       1 7   2
6   1 5       13         7   9  
        14             11   4 8  
        16     4           13    
    9       8         12   2    
14             15   16   3 10      
  9 3               11     16 4 15
    2   6   5           8 11    
15 1         12 10 9           2  
Showing puzzle number: 516
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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