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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.

250162 puzzles downloaded.

      2   13     12   8   14      
  11   3   14 7             8    
          1 5 10       2        
    1     12         13          
        5   3       14 11       8
3       11   10 9 8              
            2     10 9 3   7    
    9 11     8     2     4      
      10     9     8     11 2    
    3   4 6 12     1            
              13 2 4   16       14
13       2 5       7   10        
          9         15     14    
        7       6 5 2          
    13             16 10   8   7  
      12   8   1     3   15      
Showing puzzle number: 381
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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