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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.

278378 puzzles downloaded.

      5               9 4      
  8 13 7             14         3
  3   2 13       15 11         12 5
6   16             5   12        
      15   8   16     3 7   10    
    3   15       12   5       6 13
            6                  
    5 6   3 13         10       11
3       14         6 12   2 4    
                  1            
2 5       13   11       3   12    
    12   9 1     7   8   11      
        10   1             15   14
5 11         16 6       14 8   1  
12         14             9 6 13  
      14 8               10      
Showing puzzle number: 627
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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