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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.

189820 puzzles downloaded.

4 16   11           15   1 12 9   5
    8       15       10     13 6  
14   12   1 10           8     4  
  6 10 1 16           2 14        
    3                     4    
6             14 15       11     13
  8   15   4                    
  12     8     13                
                13     12     5  
                    11   1   13  
16     13       5 9             14
    7                     11    
        15 8           3 16 5 14  
  15     2           14 6   12   10
  5 16     12       9       2    
2   11 12 4   6           3   8 7
Showing puzzle number: 524
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Very easy (0)
Solution methods: SiSo SC
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