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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.

9   2   10     7     11   15      
12 7       2                   8
8   10   4 16   12   6 13          
        15           12   16     1
1 4 16 11   3     14              
  9             4   8   3      
  8   13   1   9           7   11
    14 5               9 4      
      1 5               12 16    
14   6           5   10   11   15  
      8   4   1             2  
              11     9   1 10 4 13
11     2   9           13        
          10 2   8   5 11   14   4
16                   1       8 10
      12   7     6     10   11   16
Showing puzzle number: 295
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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