This is a scratch version of the "asteroids" scenario from the Greenfoot (http://greenfoot.org) programming environment. This scenario is discussed in chapter 1 of Michael Kölling's book, "Introduction to Progamming with Greenfoot: Object-Oriented Programming in Java with Games and Simulations." This scenario is for discussion and introduction of programming, not necessarily the most compelling scratch project you've ever seen. From the Greenfoot scenario: PROJECT TITLE: Asteroids PURPOSE OF PROJECT: To shoot asteroids into pieces USER INSTRUCTIONS: Use the arrow keys to control the rocket: * up: accelerate * left: rotate rocket left * right: rotate rocket right * space: fire the gun