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Sudoku puzzles (Su Doku)

My database includes 10934 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x4 box contains the digits 1 through 12. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

3     12   7         4 9
    9     8       3   2
  10       11       5   6
8       4             5
      5 1   8   11   3  
  7   1     3       9 12
6 11       3     4   5  
  4   10   1   6 7      
1             10       8
10   7       11       12  
4   8       2     1    
12 5         1   10     3
Showing puzzle number: 611
Puzzletype: Symmetrical Sudoku
Startnumbers: 52
Difficulty: Very easy (0)
Solution methods: SiSo SC
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