I've seen many installations and games that have physical interactivity.
What is special in this game? Is the system that they are using? Any link with more info?
Laser Socks wasn't a special-purpose installation built for demo purposes. It was a game that normal people could build in their living room in under an hour given the right "operating system". It's one instance of a much bigger idea — that one day everyone could be authoring dynamic/physical content in this new medium just like the written word is used today.