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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.

689471 puzzles downloaded.

8 9         12     5 1  
  6     7     8   9    
  10     11 12       4   5
      6 9     4       11
    7     3       12    
5       1 7   9 2      
      9 2   7 3       1
    5       11     2    
11       6     12 8      
7   4       6 2     5  
    9   5     11     6  
  2 3     10         12 8
Showing puzzle number: 473
Puzzletype: Symmetrical Sudoku
Startnumbers: 52
Difficulty: Very easy (0)
Solution methods: SiSo SC
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