There are actually 4 planes in this game. You get a password after beating all the courses in 1 section, which allows you to open the next plane, which has completely new levels. This makes a total of 16 courses, not 4, and 100 tracks. I believe that the all courses category should be all courses in all the planes, given this. The all courses category could be renamed first plane.

WOAH REALLY? you just blew my mind

please do, I already have a starting time for it too :D Make it much more fun