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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.

255969 puzzles downloaded.

13 7     9         14 6       12  
      1 13     16       2   6 14 10
          15       5         3  
    11 6 3 7       10            
      7     14       2   3      
    15                 12        
  4         10 12       13     6  
6     9   5 15   14       10   8  
  12   13       8   2 1   6     14
  5     4       3 9         13  
        14                 11    
      14   12       15     8      
            3       8 10 5 15    
  1         16       11          
16 10 8   5       1     9 13      
  6       8 2         5     10 7
Showing puzzle number: 241
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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