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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.

277832 puzzles downloaded.

        16         10 15 14     4  
    15                   11      
12 9 3     14 15     11     7      
    7       5   4 3   12     15 1
8   6 15     13   12 9            
      12       16                
      4     7 6                
16 13       12     5 8 3     9    
    2     4 8 13     10       5 12
                1 7     8      
                3       6      
            6 5   15     3 1   16
15 2     1   12 9   6       13    
      3     4     1 9     10 11 7
      9                   6    
  7     13 5 14         10        
Showing puzzle number: 551
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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