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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.

243633 puzzles downloaded.

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