Challenges in the 900FootAlien F1 Series are inspired by the actual tracks of the Formula 1 world championship. The arrangements of straights and corners in those tracks are brilliant. While it is impossible to duplicate them exactly in TrackMania (we have Grand Prix 4 for that), some very entertaining challenges can be created by using the same basic arrangements in TrackMania.
The path to excellent performance on an F1 Series challenge is the racing line. Find it, stay smooth, and you will put in some impressive times. Most F1 series challenges are green difficulty.