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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.

275352 puzzles downloaded.

5 16         6     15 2       13  
  7       3       14   1        
9                 11 7          
11   3   10         13           8
    4   1   12 15       2       16
  2     5 6       4   9 15   7  
    8 1   9         10     5 2 3
        4             11 1   10  
  14   7 3             13        
4 11 6     13         9   3 16    
  1   13 14   5       11 8     15  
15       9       5 3   16   11    
16           1         10   2   6
          5 13                 4
        7   16       12       3  
  6       8 11     9         1 15
Showing puzzle number: 36
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Very easy (0)
Solution methods: SiSo SC
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