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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.

176871 puzzles downloaded.

1 3 7   5 4                 12  
  9     8       15 12 11         6
10       12   6           5   13 2
    4               1 8   11    
    3           14 13 5          
5 11 8         13         16   7 3
    12     5         7   8      
    2     7 16 10         14   6 13
7 2   12         10 1 14     6    
      14   8         9     16    
11 13   15         4         7 10 5
          9 7 1           13    
    6   15 12               9    
12 5   1           4   11       15
2         6 5 11       3     8  
  8                 15 12   14 5 4
Showing puzzle number: 91
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Super easy (0)
Solution methods: SiSo
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