What's the name of this movie?

I watched this movie years ago and remember loving it, so I wanted to buy it on DVD but I can't remember what it was called. It was made either in the 80s or 90s and was about this arcade video game which was actually a...training..thing...that people from outer space used to see who would make a good spaceship pilot. This kid ends up getting a perfect score and is enlisted and taken to outer space to help with some war and blah blah blah. o_o Does anyone know what I'm talking about?