Oz came across this apparently simple game 1 month ago, but we had a great time building a course. You simply draw lines and let a guy run it down on his sled. It's quite simple to do a course, just draw it just like with a pencil.
You can of course make some loopings and totally insane long jumps, but once the guy falls off the sled, it's finished, but you can recorrect the place where he fell off, so that he makes it through next time. You can make the course as long as you want, but it gets a challenge very fast.
There are thousands of videos making their rounds on the internet, like on YouTube or on the Line Rider homepage itself. There are even people who really draw some amazing landscapes around, making it look extremely beautiful. I had some great fun, very simple game, but very addictive once you started building a course.
This might be something for Submeg.
Homepage is here, and you don't have to register immediately, you can also draw courses online when clicking on the PLAY NOW button.