Sounds confusing, right? And it is. This is one of those games that are impossible to describe (unless you happen to be an optical engineer or mathematician) because it cannot be visualized until you play it. So, hmm, I will just end this not-much-of-a-review by saying that if you like Space Invaders and psychedelic swirling colors don't give you a headache, Frequon Invaders is a lot of fun (and educational too -- I didn't know anything about the Fourier Domain until I played this game). It is fun, original, and strangely addictive once you get used to looking at colored waves, although the extremely high geekiness quotient may intimidate some action gamers from trying it out. Two thumbs up!