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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.

  4     11 8 1         7        
8     7   14 5       12   16 2 13  
14   10 5       2               11
6         4         1         12
    5   14       13   3     7    
        5 10 2 3 12     8 14      
7                 5     13      
    11             9     10   16  
  14   4     8             10    
      11     3                 15
      6 12     7 9 2 8 14        
    12     6   10       11   8    
12         2         16         6
10               7       15 1   2
  7 6 8   1       11 13   3     9
        8         10 5 6     4  
Showing puzzle number: 213
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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