Thread:Flockky II/@comment-4814638-20140130093900

Well... Your Nearly Impossible tracks are very nice, but there's a bit of an issue with the mechanics of track difficulty here. Here goes... I hope this has helped. 
 * Beginner is the easiest (not including Alternate World), and doesn't require you to do anything to play on it.
 * Intermediate is trickier, but still fairly easy. You don't have to do anything to unlock it, but it's recommended to complete several Beginner tracks first.
 * Somewhat Tricky tracks are more challenging than Intermediate, and don't have prerequesites, but you should beat a few Intermediate tracks first.
 * Advanced tracks are the most challenging tracks unlocked by default. They still don't have prerequesites, but pass a few Somewhat Tricky or Intermediate tracks first.
 * Expert tracks are unlocked by reaching a certain rank, and are fairly difficult. You definitely need to beat a few Advanced tracks before even CONSIDERING these tracks.
 * EXTREME!! tracks are even more difficult tracks, unlocked at really high ranks and are also very unforgiving. You cannot save and you have to pay Monkey Money on each attempt.
 * Nearly Impossible tracks are the hardest ones ever. They are unlocked at even higher ranks than EXTREME!! tracks, and have all the rules of EXTREME!! tracks, but have some more: On most, Special Agents are banned, and you have to pass a Special Mission before unlocking the track.