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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.

192668 puzzles downloaded.

  9     11   3 1           14    
  6   1 7 9           16        
  4 8 3       6   1   14   16    
  7             6 3     13 4    
    11     4 7         2       9
6     15     13 5     7       12  
    13           5 12       10    
  2       6   12   11            
            5   14   16       8  
    6       16 11           5    
  11       8     15 9     3     16
7       1         10 2     9    
    15 5     10 7             2  
    3   5   9   16       11 12 15  
        4           5 11 16   3  
    4           3 8   7     10  
Showing puzzle number: 348
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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