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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.

242934 puzzles downloaded.

      8   16 4 15   5     3      
4       6     8   3 1 14        
    11   3           12 8        
  2     5 1     9 10   4   8   13
9 15 12         5         7      
8     10       3 7              
            8       3 11        
  7           12 14           11  
  3           14 12           13  
        9 7       4            
              10 1       16     7
      5         2         3 8 14
16   6   2   11 4     8 1     15  
        14 8           9   2    
        12 13 16   5     3       4
      7     1   4 16 6   11      
Showing puzzle number: 263
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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