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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.

901356 puzzles downloaded.

15   1   7     5             10
    5 14 13 15   9   11   3      
        4   10     13         9
8     2     1 6         13 11  
    4   9 10     3       2 1  
10     6 15           5 8 7   3
  14   5 10       6   2     13  
      4   12 13   5 9   1      
  6     3   4       11 7   12  
3   7 12 6           1 14     8
  2 8       3     1 10   4    
  15 10         8 9     12     13
11         6     13   4        
      1   2   7   8 6 13 15    
13             4     7   12   11
Showing puzzle number: 9722
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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