Here's a site that offers free Japanese quizzes and games:
http://www.nihongo-pro.com/free-japanese-quizzes
http://www.nihongo-pro.com/kanji-pal
The site is an online Japanese school that offers private lessons, but the free stuff is totally free. The kanji tools have lots of different ways to look up kanji (by grade level, JLPT level, stroke count, radical, etc.), and have stroke animations as well.
