The premise is pretty simple. Draw objects on the screen with crayon, and watch them obey the laws of physics. The key is to figure out how to use what you know about physics to move a ball from one place to another. Some of the puzzles are easy, but others take some real creativity.
When my wife first saw the name and interface, she blew it off completely. But she happened to be watching when I was trying to solve one particularly tricky problem, and got sucked in within 30 seconds. Really cool. There's a new version coming out soon.
