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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.

248583 puzzles downloaded.

        3 1       8 14 4       5
3 4                     2 15    
10     11   8 4 7 2 15 5          
  2   9                     1  
    4 15       12 8     6   13   14
  7 10     13                    
          9 3     10            
    3                     11 9  
  3 1                     2    
            15     9 3          
                    13     4 6  
5   14   6     13 11       3 7    
  15                     11   13  
          3 13 10 9 11 2   12     15
    9 12                     16 1
13       14 16 6       12 7        
Showing puzzle number: 265
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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