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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.

239179 puzzles downloaded.

15   11         8   13     14      
  10           4 6   5          
9         10 5                  
    6   15 12         9 10        
11     13                 7     3
    14       9   8 6     15      
          2 3   10 7     8   6  
  8 3 9   16     5 2            
            2 16     3   6 1 13  
  15   6     11 13   9 10          
      11     7 6   14       12    
14     4                 2     7
        3 7         8 15   4    
                  4 6         2
          5   10 7           15  
      8     16   3         6   12
Showing puzzle number: 544
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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