I read the other reviews and some of them really ticked me off. First off, GLTron DOES run on Mac OS 8.6. That's what I run it on. Perhaps someone was a dum-dum and tried playing the OSX version on 8.6? Anyways, this is an incredibly addicting game, perhaps not that in depth, but it comes very close to capturing the essence that is Tron. The music (okay, song) is very well orchestrated, and fits the mood perfectly. My only gripe is the rate at which the game recieves commands on older computers. If for example, another lightcycle crashes while I am approaching a wall, there will be a painfully long moment in which I have no control (this is deadly at high speeds). Other than that, though, the game is very good, it's a small download, and it's free! Go get it now!