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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.

255587 puzzles downloaded.

          3     8 10 11     12    
4   7       5       3       10 2
11     14       16       2     8  
3   5 2     15 8   12         11  
15 5   6   4     1   14          
13 4           14       16       10
          12                 15  
  8     15     3                
                10     13     7  
  3                 6          
12       14       2           6 9
          7   4     8   2   1 15
  11         10   4 13     7 1   8
  6     1       9       10     11
9 1       8       16       2   6
    12     16 13 7     10          
Showing puzzle number: 202
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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