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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.

8     9     12     15   7 5   4  
    5 13   11 15 3   2     9      
15     16   7   4     10     3 6 2
  10       1   6               12
12   9       10 8     5          
          4   9         11   3  
                      6 8     13
  7   2                       4
9                       1   8  
5     8 14                      
  13   15         14   2          
          5     11 9       2   7
13               7   1       11  
6 14 4     9     12   13   3     16
      5     7   6 16 14   10 4    
  8   3 13   1     4     12     9
Showing puzzle number: 132
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Very easy (0)
Solution methods: SiSo SC
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