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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.

213344 puzzles downloaded.

10   11 16 15   9         1   14 4  
  14             12 9   6     8 2
    8               15          
            4 13 16   8     15    
  11       16         7 5 4      
8           12     2            
  13 5                   14 1    
      14 3           13     10    
    3     1           4 7      
    16 10                   3 15  
            13     16           1
      6 12 14         10       16  
    15     3   9 13 6            
          11               13    
5 12     6   10 16             1  
  8 9   4         11   15 2 12   16
Showing puzzle number: 304
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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