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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.

237136 puzzles downloaded.

                        3      
  5   9 16             4   8 15  
4         1 14       16 15       7
  13 15 7   5 4 10 11              
              9   8 15 11        
  4 9     12   2   14       11    
12     8   3   16 5   4   9      
  14 10 13 7   1   16 12           5
5           11 7   15   8 6 13 10  
      6   15   5 4   1   7     8
    12       3   7   13     4 2  
        6 10 9   2              
              13 8 11 9   12 1 3  
9       12 6       16 14         13
  8 6   3             1 14   11  
      14                        
Showing puzzle number: 525
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Super easy (0)
Solution methods: SiSo
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