More examples:
Swedish numbers: http://quizlet.com/3614707/speller/
German clothing: http://quizlet.com/1692182/speller/
French animals: http://quizlet.com/1060977/speller/
Japanese adjectives (good luck!): http://quizlet.com/343188/speller/
Swedish numbers: http://quizlet.com/3614707/speller/
German clothing: http://quizlet.com/1692182/speller/
French animals: http://quizlet.com/1060977/speller/
Japanese adjectives (good luck!): http://quizlet.com/343188/speller/
I also just tried a French one (not the one you linked) and the hints to the side were less than helpful. I guess that's to be expected from a user-generated list. I think I'm also not used to listening to French, and that didn't help... Couldn't really hear what was being said. Again, that could just be my ears, though.
All-in-all, I think it'll be great learning tool... But I thought I'd bring the above to your attention.