First make sure you have a camera, that Scratch.mit.edu has access to it, and that it works. Then move and the game starts. Your goal is to catch the blue and yellow balloons (but not the red one) by moving!
all by me. BEWARE: This project uses Video Sensing extension June 11: Somebody proposed this to be featured because it is in the studio :O... I couldn find who, even Ctrl+F link to the project didnt help :(