I found this on the Web today and I'm already addicted: Chaos Theory. You just choose a contact spot, start things in motion and wait to see what happens. Kind of like bowling, but without the yucky shoes. (To begin, just move the cursor over the Asian writing until you hit a hot spot and click. It probably says something like "Start.")
When you've mastered that one, move on up to Planarity.
What can I say. I'm easily amused.