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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.

280517 puzzles downloaded.

  7   8     3 14   11   6 2   16  
          15             11 7    
        6     1             13  
        10 7     2   12       15 4
5 1   4   6 11           13   10 3
          12 15           4     9
      9   14   13     3 11 1      
16   14     1     9 8           15
14           6 10     5     3   13
      1 12 2     14   9   15      
2     7           6 16          
4 10   13           15 8   12   11 2
3 12       8   5     2 15        
  14             16     5        
    4 2             14          
  6   11 15   7   13 4     8   3  
Showing puzzle number: 276
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Super easy (0)
Solution methods: SiSo
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