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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.

177588 puzzles downloaded.

  16 8     4 7   1 12   13        
    10 9   1       6     3     14
5 7                 11       13  
                          4   7
  11 2 12 5 6             8 14 10  
8 13           3   5            
      1 15         2 8   11      
3       8   14         16 4     13
12     14 3         1   2       5
      5   7 9         8 15      
            12   3           6 8
  15 4 6             12 9 14 16 3  
11   5                          
  2       16                 8 10
13     16     10       2   9 3    
        2   8 4   9 10     13 7  
Showing puzzle number: 439
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Very easy (0)
Solution methods: SiSo SC
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