http://official-linerider.com/play.html
Line Rider was originally created by Bostjan Cadez (aka FSK) as a
project for an illustration class. Since its release in September
2006, so many people have become captivated by its simple, creative
charm. All you do is draw lines for a character on a sled to slide
down. There's no scoring, no set objectives, and no levels to
complete. Just start playing and see where your imagination
takes