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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.

275660 puzzles downloaded.

      5               6     12  
  6     5 8         7 11        
4 8       9                 13  
        16   6 14 4   13   9 8    
    8 2   4     5 7 16   10   1 12
12 7 10   3       11           4  
3       7   8       4          
            11                 7
2                 3            
          13       1   2       4
  4           1       15   3 2 11
7 16   9   3 14 11     10   13 5    
    6 14   16   15 3 13   4        
  3                 8       6 14
        9 11         1 7     16  
  15     1               3      
Showing puzzle number: 406
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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