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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.

179331 puzzles downloaded.

4 1 12                   9      
    7 14     2   13 3       16 5 10
          9     2         11 14  
11       16             12 3     2
  10 13       1 16           4 6 7
16         11 10       8   14 2   13
          2 4       12 9        
      4   5 6   7             3
2             14   8 4   13      
        1 8       6 13          
15   10 1   4       16 7         5
6 16 8           9 2       7 12  
1     12 11             13       6
  15 14         8     11          
10 3 6       15 7   12     16 14    
      7                   12 10 15
Showing puzzle number: 191
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Super easy (0)
Solution methods: SiSo
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