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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.

243459 puzzles downloaded.

    16             10   14   6 8 1
  6       8 5   3 12         10  
9         13       6       2    
              10 4   11 13   5    
  12     7     5     9          
    13 7               8 2   9 10
      8   12 9 13     3          
        10       15   7          
          14   9       16        
          11     7 1 14   5      
4 16   9 12               14 3    
          2     11     3     12  
    6   1 4   7 2              
    7       8       6         3
  4         13 11   9 8       2  
3 8 14   6   10             12    
Showing puzzle number: 33
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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