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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.

276703 puzzles downloaded.

16               11   13         15
  13   6     5 8       16 14     3
      8     13             7    
  7 10   14   16 11 1   15 8        
  11 5   1 4         12 9        
    8       12             6    
            6 15 14 2     4   9 13
              13                
                3              
1 16   10     11 7 8 15            
    4             16       10    
        8 16         7 5   14 4  
        13 1   10 6 3   12   16 15  
    3             1     10      
7     16 11       13 8     6   2  
4         8   16               1
Showing puzzle number: 31
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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