Use WASD to control the lander ship. The object is to land, CAREFULLY, on a landing pad. If you're moving too fast, you will crash. You must be facing up, or you will crash. If you run out of fuel, you're going to have a bad time. And you will crash.
AKA "Lunar Lander" ... with stuff. "Alien" sprite remixed from "Collision Detection" project: http://scratch.mit.edu/projects/2747975/