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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.

172999 puzzles downloaded.

7     2 1           8   6 12 9  
    9 12 15       3 2           13
  14 10           12           2  
                6 11            
        16                     8
    2 1                 11   16  
    13 4 11       7 8 1       14  
  10 12 14 7                     6
3                     16 12 8 7  
  15       5 14 8       3 16 10    
  5   10                 3 13    
1                     9        
            13 1                
  9           14           4 5  
8           6 11       13 1 15    
  12 6 13   3           15 9     11
Showing puzzle number: 164
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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