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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.

276089 puzzles downloaded.

      7     15 4   5     11      
11                     4 16     14
6         10             15      
      9 14           8     3    
                        3 13 12  
              16 9 1   5        
3 13 16         11 4 15 2         1
5   14 4 8           12     10 16 11
7 11 4     6           12 10 9   3
14         16 1 9 10         8 11 2
        11   10 13 7              
  16 9 8                        
    6     8           10 1      
      3             14         12
13     14 1                     15
      12     2   16 13     4      
Showing puzzle number: 401
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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