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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.

    13 8 5 6 9           11      
  11           8 16 6 15         2
15 9                   1        
  1 16     10       5            
7 15     8     9                
2     12   4 11     1       15    
        10                 13    
    11   7 12         5 9   2    
    14   3 5         8 7   4    
    8                 4        
    7       10     16 14   13     8
                15     12     9 3
            4       11     14 6  
        11                   13 7
8         15 5 10 7           11  
      14           3 13 10 16 8    
Showing puzzle number: 332
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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