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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.

248027 puzzles downloaded.

    9   12 16   2             14  
        14       13 10 4 6        
11   8           14     1   15 7  
3 14 13   10 6       11   9   12    
          15     9       2      
12                 6         8 11
1   4 8       13           10   15
    10 15 8           1       5  
  7       12           4 10 3    
10   6           15       16 8   7
5 3         10                 2
      2       6     12          
    15   13   12       8 5   2 3 1
  5 2   6     4           11   12
        2 9 1 5       7        
  1             11   14 12   5    
Showing puzzle number: 548
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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