Disclaimer: Scratch is a trademark of Massachusetts Institute of Technology, which does not sponsor, endorse, or authorize this content. See scratch.mit.edu for more information. This is the fourth video tutorial in Mr Cai's Scratch tutorial series. Please take note that currently all videos in this series are recorded in Chinese with no English subtitles. This set of tutorials are designed and produced by Mr Cai - an experienced independent game developer who had previously worked in several top-tier digital entertainment and game studios. These tutorials are targeted at elementary and secondary school students with a passion to create your own games/stories. The tutorials will lead you to create a variety of fun games to fully learn the basics of the Scratch platform. At the end of each lesson, you will be asked to complete a small challenge by yourself, which will be explained in detail at the beginning of the next lesson.