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Sudoku puzzles (Su Doku)

My database includes 12449 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x5 box contains the digits 1 through 15. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

628822 puzzles downloaded.

    13   15 11               2  
4           8 2 7         14 3
14 1       10   12     6 15 13    
      9             4 2   1 5
1   11           8 6   14 12    
3   12   2 15                  
  11         7   5 9          
  10 3 12 9   2   1   5 4 11 15  
          4 15   11         10  
                  5 9   14   6
    4 6   9 3           7   8
8 5   2 7             11      
    7 14 3     13   8       5 4
5 2         12 14 10           15
  4               2 12   10    
Showing puzzle number: 4395
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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