use line rider 3 beta and click on the start point.2 bosh faces will apear one will be crossed out , click this one and play your track hope this helps (_)
it snaps the line. ex. _______ ______ see the space, with line snapping the secong line will attach itself to the nearest line giving you a line like this ________________ that's what line snapping...
Well it relly depends what you want.
If you want beta 2, you can download it on some website just Google it.
If you want the actual game however, you will have to buy it.