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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.

195950 puzzles downloaded.

      3                 13   12  
1   4   6 14 13                 2
      14 1       13 15     10      
15       10 7     16     6     5  
  5 2 11 14           4       9  
4         2   13           15    
  16     11             5        
  13     9   6     14   12     11  
  6     4   10     2   8     3  
        2             3     1  
    9           6   11         13
  3       8           15 6 5 7  
  7     15     16     8 4       9
      1     5 6       9 15      
9                 13 15 7   2   16
  15   13                 14      
Showing puzzle number: 572
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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