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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.

275271 puzzles downloaded.

5 8         13             1    
3           14 7   9   16     8  
    2 11   3     10   5          
7         9   8 1 2 3          
                        4   5  
                  5 7   9      
        7     10         16      
  7   6 14     2     11 13 8   15 10
10 4   9 6 13     8     15 1   3  
      14         7     1        
      5   15 16                  
  12   1                        
          2 6 1 16   15         8
          16   3     4   10 15    
  11     4   12   9 10           16
    8             1         4 3
Showing puzzle number: 576
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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