Rather than try to explain what Line Rider’s all about, I’ll just let the blurb on the front of its site set the stage:
Boy grabs sled. Boy rides sled. A simple concept yields endless fun and the latest Internet Phenomenon is born! In Line Rider the player draws their own landscape with a simple pencil tool creating as many ramps, hills, and jumps as they can imagine. Then they send a virtual sledder careening down the course until he wipes out. The possibilities in Line Rider are only limited by the player’s imagination.
It may not be obvious from the description, but Line Rider is more or a creativity tool than a game. You don’t really score any points, and it’s not really possible to win. You just create a course for your little sled-guy to go down. You can tweak it to your heart’s desire to try and get him to do interesting things, then record the course, set it to music and post it to Youtube. Like so:
You should note that’s not me playing. I’m barely talented enough to draw a couple of straight lines, and there’s no way I could spend more than a few minutes drawing a course, much less the multiple days that some of these things take. In fact, I had lots more fun seeing what actual artistically talented people can do, and what they can do is, more often than not, pretty amazing.
If you’re so inclined, you can try the game out over at the official site.