Chinese character training java applet

How difficult is it to memorize symbols? To find out I wrote this applet for practising Chinese characters. So far it knows 100 simplified characters (distributed at two levels). Hopefully I will get addicted to this simple edutainment game and eventually know enough characters to understand some written Chinese text. The applet could be fun for Chinese learning English too. Try it out!

You need a score of 50 to advance to the next level.
The applet works fine on MacOS, but unfortunately the characters do not show up correctly on Windows XP.