On the same site you can now win a Silverjuke Licence by being the best Space Invaders player.
As you can use your keyboard, this should be no problem - some teenage boys are only using the signals from their brains to make movements:

- space-invaders.jpg (34.28 KiB) Viewed 2116 times
http://news-info.wustl.edu/tips/page/normal/7800.html(no joke: this is an article from the Washington University in St. Louis)