We are preparing for you these sudoku variants:

10.09.2012 - Sudoku extraregions
11.09.2012 - Arrow Sudoku (the competition variant was prepared by player KrtekHonza)
12.09.2012 - Greater Than
13.09.2012 - Diagonal sudoku
14.09.2012 - Windoku
15.09.2012 - Non-consecutive sudoku
16.09.2012 - Even Sudoku

http://sudokucup.com/node/1901
You can find us on FB too: http://www.facebook.com/sudokucup