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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.

243953 puzzles downloaded.

    2   15         1 13          
9     14 6 11         7       8  
  16 8 12     13     11            
                      15        
        1 12     9   15   2     8
2           5 4   8   6 15      
15 1                       7 14  
5 7             14 10       3 11 4
12 8 1       7 11             16 2
  14 11                       12 9
      16 4   3   1 12           7
4     10   2   6     16 8        
        8                      
            10     3     16 4 2  
  10       13         1 2 8     6
          4 1         9   14    
Showing puzzle number: 495
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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