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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.

255787 puzzles downloaded.

  14 12 16     8             1    
    11   14   12 5   3 16   9      
2       15       4 8   11        
    15 6 9                 10 4  
              14   16       3 2 8
      14             2 3       12
    7       6                 4
    16   7           1 5   6    
    3   11 12           15   7    
16                 7       9    
9       5 10             3      
6 1 10       3   11              
  15 14                 6 4 11    
        2   1 11       16       6
      1   3 16   8 13   10   14    
    6             9     13 15 12  
Showing puzzle number: 415
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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