Forget Line RIDER, this is Line GOLFER! Throw on your best Plus 4s, draw your own course and hit the fairway... or whatever you decide to create! All together now.... "FORE!"
I've just learnt that this uses the APE Physics engine - which is free and open source - so if you fancy making something like this yourself, check it out:
http://www.cove.org/ape/index.htm
http://www.thegameslist.com/game/87/Line_Rider (the original)
and...
http://www.thegameslist.com/game/65/Free_Rider_2