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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.

279333 puzzles downloaded.

    3 2   9       12 11       16 5
    10 11 15 8           6 13   3  
  4       7               12    
      14 12   13   10              
3   5                 9   13    
    2                   3 14   7
4         2 7 14     6         12
13       3         7         5 10
14 2         15         12       3
6         10     1 4 15         2
10   4 5                   15    
    7   16                 9   11
              13   6   14 16      
    14               16       7  
  8   4 6           3 11 12 5    
7 5       16 10       2   14 3    
Showing puzzle number: 405
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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