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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.

756740 puzzles downloaded.

      11   1       4 7  
  4   3 7 6           10
  12         4 9       3
5         12   2       11
        11              
11     7   3       10    
    4       3   5     2
              11        
12       5   2         1
10       1 5         6  
8           7 6 1   3  
  3 9       1   11      
Showing puzzle number: 606
Puzzletype: Symmetrical Sudoku
Startnumbers: 44
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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