What they do is, after a period of time, pick a random object in their vicinity to hop at. When they need to hop, a force is applied both towards the target and away from the center of the planet, and a sound is played. A max number of attempts is determined when the target is selected, and after that number is passed, the hopper gets bored and waits for a bit before selecting a new target and repeating the process. <3 Tweeted that one, as well. Everyone else: Thanks for the feedback and testing. Glad to see the linux and mac versions don't catch on fire, I updated the post on the blog to reflect this.