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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.

280482 puzzles downloaded.

8   13   3 12           4 6      
  7       14   11     13          
10             16               4
        13 4   5       2   14 11  
  16 11 9             12       3  
  6           3   16 5     13    
7 10           15       14 9      
    12 15 4     7   6 10         8
16         3 7   9     13 10 15    
      7 6       3           9 5
    9     2 14   6           12  
  3       11             7 8 14  
  9 16   7       12   4 6        
12               8             6
          1     5   15       4  
      14 12           16 11   10   3
Showing puzzle number: 192
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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