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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.

280418 puzzles downloaded.

  1   2 7     11 14              
  3   4   2     12     1 16      
            5   3           8 12
11     10       4               6
          12         16 9 8 5    
7             14     15   9   12 13
  16     15   9   8              
      9   11   1         6 10    
    8 13         16   1   5      
              2   6   8     16  
5 7   16   13     9             4
    10 15 16 3         12          
10               1       3     16
3 9           16   4            
      8 2     9     10   7   6  
              13 5     7 15   4  
Showing puzzle number: 473
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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