LEGO Mindstorms Robotics Invention System 2.0 (3804) Create thousands of robotic inventions! Build and program robots that walk explore, play catch, sort pieces of candy by color, draw mulit-colored sketches and much more! Includes Constructopedia CD-ROM with instructions for Challenge and Pro Challenge level models! Runs on Windows 98/Me and uses USB port Contains 717 pieces for ages 12+