Meh. That's a pretty simple thing, it's basically Pong. This, however, is the shit.
http://www.robocup.org/
Building a team of football playing robots that will play against the 2050 World Cup winners. A fully autonomous team that will run around on the field and make tactical judgements based on what the humans and their teammates are doing, that's pretty tricky. I wonder if they'll have a robot coach screaming at the sideline?