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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.

243642 puzzles downloaded.

9 8         12 13                
7     15             6   9   4  
    4 11 15               12     16
    16   9       14              
  15   2           5     14   6  
1 16   12 13   15                  
3         9   5   13 11     2    
      7 6   14       1       13  
  7       16       3   9 11      
    11     5 13   4   2         8
                  8   14 2   16 7
  14   16     6           4   12  
              8       3   14    
8     13               1 16 15    
  11   6   1             7     3
                12 4         11 2
Showing puzzle number: 449
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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