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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.

220116 puzzles downloaded.

4   14   12     2 9     15   10    
                        16 5    
    3     8         7 10   11    
            14           13 7   6
    2       15       3       5  
    8 3   14     15   16 4        
          13 10 16                
15 14     9       5 12   13     2  
  8     16   4 6       3     1 12
                2 4 15          
        7 10   8     13   2 6    
  15       3       16       13    
11   10 8           3            
    1   11 2         12     15    
    4 5                        
    9   3     10 16     11   2   8
Showing puzzle number: 321
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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