Free Rider is a game similar to the popular Line Rider series of interactive track creations. In Free Rider you can design your own set of ramps and roads for your biker to jump off of and navigate while collecting stars to complete the level. Free Rider takes a lot of the ideas from Line Rider and builds off of them, offering a new game but with a familiar feel to it. TrackMill's special Free Rider page will let you, if you're registered on the forums, save your own tracks for everyone to play and let you comment on tracks created by other players.
LOL seriously. 54 maps, for crying out loud! More than anybody on Trackmill I've seen. You probably noticed I was running out. Because who calls their map, "That One Course"? Rate 10 anyways, and supply some good names!