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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.

242940 puzzles downloaded.

4 16       8           14 11      
    14 12 15             3 8      
1   6   10   3 7   8           12
13     15 12   5 14       1       16
14 6           5   7       10 1  
  8 5   4     15     12 6     11  
7             11   15            
                          16    
    2                          
            6   5             2
  3     5 7     13     2   6 15  
  4 16       15   14           9 7
6       3       9 1   8 10     15
3           8   6 11   5   12   14
      9 11             15 4 13    
      11 7           2       6 5
Showing puzzle number: 630
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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