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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.

194303 puzzles downloaded.

              6         10      
      10 11           7 4       8
12   6       4     11       16 14  
        7     10   14            
  8       7 14         1     10 3
6       12   11 13 14   16       5  
    7   1         4 13     14    
    1                       4 12
8 14                       3    
    2     16 10         9   11    
  6       5   2 11 12   15       4
11 5     6         10 3       2  
            8   5     14        
  15 8       1     7       4   16
7       2 9           10 6      
      5         12              
Showing puzzle number: 595
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Harder (0)
Solution methods: SiSo SC SB DC XW
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