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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.

280517 puzzles downloaded.

            2   7       1      
3       4   16               6 12
      1 15 5             10     9
        7   14 1 13 5           3
  5   2 9           15 14     12  
      13   11               3    
4   1 15     8         12 16 6 2  
12                 10   9 14 13    
    4 11 14   5                 7
  1 12 9 11         16     6 10   2
    15               14   12      
  16     2 1           11 5   8  
5           9 15 6 2   13        
16     3             9 1 7      
1 10               15   16       11
      6       5   14            
Showing puzzle number: 59
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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