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Sudoku puzzles irregular (Su Doku)

My database includes 1031 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every box contains the digits 1 through 12. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

497868 puzzles downloaded.

7   5   11   1 6 2   4  
12   1       8     3    
    8     2   7 5      
    2       3     11    
  3         9   8     6
    9   10     3 11      
      3 1     12   8    
11     8   9         2  
    11     12       7    
      9 3   5     10    
    3     1       2   5
  5   7 2 10   9   4   12
Showing puzzle number: 186
Puzzletype: Symmetrical Sudoku
Startnumbers: 52
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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