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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.

255519 puzzles downloaded.

  3     6       16         2    
11 10             4 8     9      
7 1     16 12                 15  
  2 6         15     12   7 1    
  8   9 11         5   14     13  
        14             11        
    13       2     6 3       5  
  7     8 15               16    
    2               5 16     6  
  14       2 1     13       7    
        9             6        
  12     5   13         7 1   2  
    1 5   16     3         9 10  
  9                 2 4     14 15
      13     6 3             4 12
    3         2       8     7  
Showing puzzle number: 190
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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