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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.

197823 puzzles downloaded.

  5       7 9           1     8
    15 7 3     16     12       4  
      14 5             6     3 9
      13   6     11              
3 10     9     5             13 11
      15         16              
        6     12 14   9 4        
  9     8   13     12 15          
          9 10     13   3     15  
        1 2   6 9     5        
              13         2      
2 11             15     7     6 16
              9     2   4      
15 8     7             9 11      
  3       13     4     1 9 8    
1     11           8 7       2  
Showing puzzle number: 101
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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