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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.

280517 puzzles downloaded.

                          11   3
            10 8       4   13 5  
7   3       4         11        
      6   9   14         8     10
        14 4     16 13     10      
      3 6   8           13 1    
12 8     16 13             11   14  
2   14     11   5   10     7   4  
  16   11     9   5   7     15   4
  4   1             3 6     13 14
    12 5           4   10 6      
      7     5 4     13 12        
1     15         9   4   3      
        1         12       9   13
  14 7   5       3 11            
13   6                          
Showing puzzle number: 92
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Very easy (0)
Solution methods: SiSo SC
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