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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.

233054 puzzles downloaded.

      4 5       7     16 10      
13 7           2   6   5     16  
    5 6       1         3 2    
    16 15         3         6    
3       2 5     6     10       9
      7     11       9 13   12    
12   2     10 13   1 3       14 4  
14     9   1       16   7        
        9   5       12   15     3
  13 7       2 4   1 6     10   11
    9   11 16       15     4      
15       1     10     2 3       13
    11         5         8 13    
    1 12         9       11 5    
  6     7   1   14           12 16
      14 6     11       8 2      
Showing puzzle number: 645
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Super easy (0)
Solution methods: SiSo
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