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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.

255739 puzzles downloaded.

    13           11   5   14      
  14 1 15 5 8     2     13 7      
        10         1 14 16     6  
            14     7   12        
            12 9     15     11 4 7
      14                   12    
16   3 9 1     6                
    10             6 11       8 9
6 15       4 16             14    
                10     4 1 6   16
    9                   11      
5 10 12     15     1 11            
        16   11     3            
  11     4 10 5         2        
      12 13     8     10 7 2 9 11  
      5   2   7           13    
Showing puzzle number: 460
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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