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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.

250681 puzzles downloaded.

      6     16   5 3       10 4  
            8   4         14 16  
8 7 15     5 11   16 6         2  
  1     2     3           12    
    5               14       9  
  4 13           12 2         10  
  12 10                 5 11     14
    1 8   7   5   4 11         2
2         4 13   3   8   10 6    
16     3 10                 15 7  
  13         5 7           8 3  
  10       2               11    
    3           7     8     11  
  11         15 1   13 5     9 12 10
  16 9         11   1            
  8 4       2 13   9     5      
Showing puzzle number: 176
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Super easy (0)
Solution methods: SiSo
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