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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.

246066 puzzles downloaded.

3 6         16 7                
  5       3             14 9    
              8 2     15        
11         14             3   1  
      3   5   1 4       9     14
7 10         6     2 9          
1 8 15 12 10               4     13
  4   5 16         13     1   15 2
10 1   11     3         2 5   6  
2     9               7 10 11 14 4
          11 1     10         8 9
13     7       9 6   5   2      
  2   6             15         10
        3     15 9              
    14 1             16       7  
                7 6         3 1
Showing puzzle number: 167
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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