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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.

213386 puzzles downloaded.

2   13 1   15     6   7 3     12  
  12         7     16     13      
      15       13     9          
  5       10 9   8 4 13   1 7    
3             7     1 11     16 15
      12 16   14       3   4 6    
4     11         12         10 3  
            10   13 9     12      
      2     15 4   6            
  1 11         6         8     16
    14 10   16       1   2 5      
7 16     2 1     4             11
    3 9   7 11 5   12 14       8  
          14     5       2      
      16     1     2         7  
  11     9 6   8     4   15 12   13
Showing puzzle number: 216
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Very easy (0)
Solution methods: SiSo SC
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