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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.

251813 puzzles downloaded.

2     5 11   8   10 16         15 3
        3   5   2   1 6       9
      13 9 6   10 8   14     1    
    15 6     1         4 7      
                    16 10 9      
        13 5       1       11    
  10     2 3       5   11        
13     12     14                 15
5                 12     14     11
        6   13       2 3     7  
    11       10       15 8        
      9 1 14                    
      15 12         3     8 6    
    12     16   5 7   4 1 11      
6       10 8   9   11   15        
9 2         6 3   8   13 5     14
Showing puzzle number: 451
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Super easy (0)
Solution methods: SiSo
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