Registration is required, but not necessary. Your high scores will be posted for your very own 15 minutes of fame. If you have a memory for numbers, or if you just dig astrology, you'll enjoy this game that tests your knowledge of famous birthdays.
Registration is necessary but free.
This site includes instructions, so anyone can learn to construct their own wriggling model. You need a Java-capable browser. Try out the language translator and have some fun. The translator requires Java. You will need Java to play this one.