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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.

175337 puzzles downloaded.

10       16       2 4       1 12  
    5   11           6 1     15  
    16           12 10 8     9 6  
2       12 15 1     5 3     13    
            2       11 12        
5         12     4     13     3  
    11       4 3                
1   15       11                 12
15                 2       12   7
                13 16       4    
  8     4     11     14         10
        13 10       12            
    14     9 6     15 7 4       8
  5 12     1 8 2           15    
  16     15 13           6   5    
  1 4       12 10       5       3
Showing puzzle number: 343
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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