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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.

246074 puzzles downloaded.

  3     8 4 9         1 5   10 6
      5 15   3 1   4 13 8   2    
  2     14 12         3   9      
      6         16     9 3      
10   2                     14 11 15
  7   11   5 1             12    
  4   9   13   14           5    
        4 9     12 8   16 1      
      16 13   8 12     15 11        
    5           3   7   12   8  
    6             9 10   7   15  
11 14 9                     10   1
      10 16     8         15      
      7   1         11 14     12  
    8   3 14 12   15 7   13 16      
9 12   3 5         6 16 10     1  
Showing puzzle number: 413
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Super easy (0)
Solution methods: SiSo
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