An area covered in mysterious secrets. Rumors say that it's actually a black hole, explaining the odd behavior of the track. Other rumors say that the track is completely computer generated, a track in cyberspace, or a whole new dimension. The ultimate challenge!
Also worth noting is the fact that Phantom Road is quite literally the F-Zero counterpart to Rainbow Road from the Mario Kart franchise (which, interestingly enough, actually appeared in F-Zero X for the Nintendo 64).
Slim-Line Slits is the final course in the diamond cup. This is among the hardest courses if not the hardest course in F-Zero Gx. with Ice-Slip zones, Split roads, Cheating AI, Inverted and twisting turns, and Pit zones that end with no guard rails. The one lap on this course is about 13220 meters long.
Story Mode Mission 9
Mission 9, the last chapter of story mode, takes place here and just like its Grand-Prix counterpart it is extremely challenging. with no walls or hazards (Other than falling of the course) it is impossible to run out of boost here and die. On a side note the are no walls on this course at all. And to top that there are a series of tricky turns that could require a near-perfect drift and control.