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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.

  1 8     2     6 13     9   11 5
  9                     3      
  10         5 9 4 16       1 8  
      5     6                 15
          15 2 16   9     13      
    10 1   11     16 4 13     7    
  15 3 13 5     6   7            
      8                     4  
  7                     12      
            1   13     12 14 10 6  
    6     9 10 15     16   8 11    
      16     12   1 11 5          
11                 8     16      
  12 5       4 2 10 14         3  
      14                     1  
16 13   10     8 14     3     9 2  
Showing puzzle number: 423
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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