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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.

243575 puzzles downloaded.

15   12         6             9  
9       8     5 11     4 13     1
13       11 9       10   3 7 2   15
16     3   14   10 15 1            
14 11       4                    
12         8   2   9   11     14  
  8 3     15       5 6   10      
          10                    
                    3          
      12   5 8       4     7 11  
  6     9   13   16   7         5
                    1       10 2
            14 16 9   11   4     13
6   5 13 2   9       12 15       10
8     11 5     4 3     1       6
  12             2         11   16
Showing puzzle number: 88
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Super easy (0)
Solution methods: SiSo
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