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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.

184740 puzzles downloaded.

13           15     10   2       9
    15   7 11   5 8 12   9   16 6  
    11         14   13     5      
8 4   7               3 2   15  
        15         4       8   14
      16 4 7   8 12         1    
    7       12   10         5    
              6   8 7 5        
        5 14 6   3              
    8         11   5       3    
    14         10 2   13 15 6      
1   9       8         11        
  3   10 2               12   11 7
      4     14   15         6    
  2 6   1   9 13 16   3 7   4    
7       6   3     11           16
Showing puzzle number: 386
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Very easy (0)
Solution methods: SiSo SC
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