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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.

206193 puzzles downloaded.

    1 6         2             13
  4     12 9                    
      13 6   7 14   10 16   5   1 11
                3 5 11          
  2             14     10 7     4
  5       16   10 8              
  7           2         16     9
14   4             13     11 1    
    14 12     13             15   1
2     9         1           11  
              3 4   12       13  
8     10 2     6             16  
          1 4 7                
9 11   14   10 16   15 2   12 3      
                    6 16     2  
10             13         1 9    
Showing puzzle number: 309
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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