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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.

280517 puzzles downloaded.

5 16   15   12 10         13        
                            13  
2 10 13 9 8           7     12    
          3   2 11       9      
    8         11     9 2       10
  7       10 8   13   11   4      
16       14       12              
  11 1       7         14 13     15
8     5 13         14       10 1  
              3       4       13
      7   8   14   5 1       15  
6       12 16     15         4    
      8       9 4   13          
    4     5           11 7 16 10 9
  3                            
        3         10 8   2   11 4
Showing puzzle number: 143
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Very easy (0)
Solution methods: SiSo SC
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