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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.

    11 5 6   15     1         9  
    16             13   5       6
      6             7 14 8      
    4           3     12     1  
      12       10 9 4         16  
  4 13 15             10       5  
    8         9 5 15     7      
  1   2       13             10 4
15 9             2       1   3  
      1     14 7 15         6    
  10       4             14 2 12  
  16         8 5 14       10      
  2     7     11           8    
      14 16 9             5      
13       15   6             12    
  6         13     7   9 2 4    
Showing puzzle number: 515
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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