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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.

243956 puzzles downloaded.

            5     14   15   2    
    7       2   1         3    
    5   1         12 7       9 16
  6               10 2         12
    12   15   7     1           9
    1         16   13     5     2
          4 14     8   12       1
6   15       3   11       12 8    
    11 5       14   15       6   8
4       7   16     11 9          
12     3     11   2         16    
2           4     7   6   15    
13         7 9               2  
16 9       14 15         10   1    
    6         4   2       9    
    8   13   6     16            
Showing puzzle number: 519
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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