Here’s a weird one: In Lost Aliens your goal is to get all of the aliens to the bullseye. If you click on an alien, it’ll move one space to the right, and if there’s another alien next to it, it’ll leapfrog over it. However, if an alien lands on the blue crystal it’s stuck. To get it unstuck, you have to click on the pyramid, but this will only work if another alien, who will out some sort of pulse to free it, is next to it. Other obstacles appear on the way, making this Flash puzzler addictive and challenging, not to mention bizarre.
source post [Jordan Running] 1/5/2006