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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.

247831 puzzles downloaded.

    12     2     9              
              7     12          
  11   2 5       6 8   10 14 16    
    13     6 1 12         3 5    
7     16   12   10 4   6 2 5   13  
      8                 11 2    
4     13           9 7          
    2     14 7             9   8
2   9             16 3     8    
          4 2           15     9
    15 11                 7      
  1   5 9 8   13 15   4   2     3
    7 3         10 11 2     6    
    8 6 7   10 2       3 16   9  
          1     16              
              6     15     11    
Showing puzzle number: 195
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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