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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.

4 14     6   15 5   7   1 12   13 9
          2 13   15   9 8       3
    10   16   1         14   2    
15 12       11 7 3   10         4  
  2   15 11   12                  
14           2       11     7   12
8     4         12              
  7           1 9       11   16  
  3   8       12 2           11  
              13         2     16
9   5     15       12           1
                  9   5 10   14  
  9         5   7 13 6       2 10
    6   13         5   9   14    
1       10 6   16   14 2          
3 5   12 14   9   4 1   10     6 11
Showing puzzle number: 8
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Super easy (0)
Solution methods: SiSo
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