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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.

255589 puzzles downloaded.

      16     1     10   8     3  
  1     6   12       9 15 14 16   13
    14 12 16 9   5   11     7     1
    13     14           1        
  16           1                
4           3   10   6 2   14    
3 13       2               8   9
        7 13 9     16       6    
    10       5     2 8 7        
13   7               14       16 5
    9   14 16   6   3           10
                13           4  
        8           7     11    
1     8     11   9   15 12 2 13    
10   5 11 9 6       1   13     12  
  9     1   2     4     10      
Showing puzzle number: 233
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Super easy (0)
Solution methods: SiSo
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