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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.

249718 puzzles downloaded.

      5 16       6 14   10 7      
    14       10   7         4    
    11         7 16 3         1  
  10     6                 14    
    13   1           10     11    
1         11       16 4   13      
      16   6 14   11             10
14   3 11         12     7     9  
  3     4     12         14 13   1
4             1   10 7   5      
      15   16 9       3         12
    5     2           9   7    
    4                 15     11  
  2         8 13 9         5    
    12         11   2       15    
      14 5   15 6       4 16      
Showing puzzle number: 266
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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