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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.

243348 puzzles downloaded.

                  2 6     15    
  12   5 7     1   4         14 16
16     1 5                   8  
  15 2 4         1     11 9      
      2       7                
        4 5 8   6       15 16    
  13           14           4    
    15   12         16   2 14     1
9     3 14   13         12   8    
    5           16           7  
    1 11       5   7 10 15        
                13       16      
      9 8     10         11 5 15  
  7                   8 1     10
14 16         5   9     7 8   4  
    11     4 12                  
Showing puzzle number: 217
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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