multilingual 5ud0ku 
Our JavaME
5ud0ku got equipped with a new language set. The puzzle game was created in 2006 for feature phones (not some many smartphones around at that time), but it still is downloaded and used a lot.
So now
5ud0ku contains czech language set in addition to italian, norwegian, russian, slovak, hungarian, polish, english, french, greek and german. If you don't own or want a smartphone, but still want to play a decent game of sudoku, try
5ud0ku (point your mobile to
http://wintermute.de/wap/sudoku)