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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.

243788 puzzles downloaded.

  7           14 10 12   9 1 16    
5   10   3   12 7   13         8 4
    1 12             11         5
    9 8     11     16 5       2 13
  10         2   11 14   3     1  
          5   8 1         14    
  2   7   11                    
      1         16   13   11   7 12
4 5   2   8   16         6      
                    2   16   13  
    15         11 8   14          
  13     1   10 3   9         4  
13 4       2 9     11     7 3    
12         10             15 11    
1 9         7   12 5   15   13   16
    3 15 14   1 4 13           6  
Showing puzzle number: 389
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Super easy (0)
Solution methods: SiSo
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