Have you ever heard about Line Rider? Its a game where you can draw the tracks, and let the rider ride on the track you draw. You can play it for free at www.linerider.com.
For me, this is a very interesting game, I played for around 2 hour after I watch a video on YouTube about the game. And yes, you can find a lot of video on YouTube, different tracks for Line Rider, and some are awesome. Me myself also created a tracks, and you can view the track on the video below.
Now have a try! www.linerider.com