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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.

216568 puzzles downloaded.

        12 13               2    
  7   6 16     15           12 10  
        11       13 9       3   7
        5   2       3 10 15      
    9     16                 5  
          4 7 10     11 5     1  
2         5         10          
4             3       9 12 10 7  
  8 2 9 3       1             12
          11         16         8
  4     1 7     12 13 15          
  12                 5     14    
      8 15 12       4   1        
15   6       4 1       2        
  2 5           10     15 4   8  
    4               9 7        
Showing puzzle number: 152
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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