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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.

275713 puzzles downloaded.

      15               7        
    11   7             9 13      
  10 16     4   1   5   6        
      8 15 16 6   12             2
              6 7 4           9
11 8               2            
15   1 9 10 7                 5  
  7       8 1       9       4  
  3       12       14 2       8  
  9                 5 10 3 4   15
            4               2 14
1           5 7 13              
10             14   6 15 12 16      
        16   12   9   7     14 15  
      11 1             5   2    
        4               5      
Showing puzzle number: 563
Puzzletype: Symmetrical Sudoku
Startnumbers: 72
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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