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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.

173712 puzzles downloaded.

12 16 2 7   11     14 3 8 9     10  
          7 2 10   6 5          
    5     1 6 8   11 13          
    10       14               11  
  4         11           16 15 9 8
13                     2     7  
9 5   2   12     6     15        
10             3     9   4   13 6
5 7   16   2     13             10
        10     15     1   11   8 7
  9     16                     12
2 1 8 10           14         5  
  8               9       5    
          9 16   3 2 15     13    
          15 3   5 16 11          
  13     14 8 1 2     7   15 11 6 9
Showing puzzle number: 153
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Super easy (0)
Solution methods: SiSo
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