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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.

      7   6   12     2     10    
  3     14     10           11   13
  12 14       8           1   3  
16     10       15 13           7  
    1             13            
                  12   11 6 9 15  
    9 2     15   16   5     4    
3   4   11       2     6 7   14  
  7   3 15     2       1   16   6
    6     13   3   2     8 5    
  13 12 1 8   6                  
            1             12    
  14           13 12       16     11
  10   9           6       14 4  
5   7           3     14     10  
    13     14     1   8   9      
Showing puzzle number: 155
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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