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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.

          13     1           10  
        4 9   11       10     5  
4 14                     13 15    
1   11 10   12 15 6           9   7
  3     14   16     5     10   4 1
    7             13 15          
9                           13  
  6     5 1     14 10   2 15     12
3     11 12   14 2     1 9     7  
  5                           9
          3 7             5    
12 7   14     1     2   3     6  
15   5           9 1 12   4 8   10
    12 6                     14 15
  11     6       8   2 15        
  13           8     14          
Showing puzzle number: 475
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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