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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.

248044 puzzles downloaded.

10 11                     7   4 5
      3 7   12           10     14
  13                 3 10   2    
7         5           1        
5   6         13   9 1 11   4    
  12 1     9 15       8          
  16 9 8                   7 5  
        10       5     6       12
13       11     16       3        
  14 11                   12 13 7  
          14       4 12     5 10  
    10   6 8 3   11         14   16
        16           11         9
    14   8 10                 6  
2     12           15   9 13      
9 4   15                     16 8
Showing puzzle number: 270
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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