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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.

276240 puzzles downloaded.

      5   16         12 4        
    3       5                 2
                3 5   11     12 4
        7 1 14       10          
6 9   10 12   7         15     8  
5       14     16       10 4      
            3           6      
15 13 7         1 6       9   3  
  12   16       9 8         11 14 3
      4           16            
      1 16       4     13       9
  10     5         3   7 12   16 13
          15       6 4 8        
2 8     3   12 5                
9                 1       6    
        13 6         9   14      
Showing puzzle number: 53
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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