This project uses video sensing so you will need a camera attached to your computer or a built in camera. Move the JetScratch up and down to avoid the rocks. If a rock hits you, you lose a life. It takes a bit of practise to work out the controls. To make JetScratch go up, wave your hand or make some other video motion on the big letter U. To make JetScratch go down, wave your hand or make some other video motion on the big letter D. Click on See Inside to play around with the code. See if you can make JetScratch go at different speeds.