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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.

3   5 1   2   14         4      
        12     10       2        
12     14 8   6   1   15 10       11
16 4           3         12      
  7         1 2       4 9   11  
          6           7     1  
  6       7     11         12   8
      5                 15 7    
    14 15                 1      
10   13         5     7       3  
  3     4           16          
  16   11 9       14 12         5  
      12         16           4 5
14       6 10   1   7   9 8     3
        5       10     1        
      7         3   12   13 1   10
Showing puzzle number: 585
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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