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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.

              16     11     3   7
          7       10           14
7 10     14 12 2       5 1   15    
3 14           9       6        
      14   16   1       15   12   8
    11               10   2      
16 2   7 12       3   1   6 9 11  
      1             12   7      
      10   4             11      
  6 16 11   8   12       10 5   1 9
      13   14               7    
5   9   2       1   4   16      
        16       10           9 5
    14   6 9       5 2 16     8 13
1           10       7          
13   5     1     9              
Showing puzzle number: 148
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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