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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.

279429 puzzles downloaded.

11 8     15         16            
              14   11   3 15      
  5       12                   10
14     2     4     13     16     6
  3 10 9     16 6   15       11    
              10 3              
  14     8           13 2     10  
13   15           11   10     9   14
8   11     4   1           2   5
  9     10 3           7     13  
              13 4              
    3       2   10 14     7 4 16  
3     14     7     10     6     16
4                   2       15  
      15 11   14   7              
            6         16     14 4
Showing puzzle number: 211
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Very easy (0)
Solution methods: SiSo SC
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