In the last unit, you were introduced to some basic concepts in computer science, such as algorithms, sequence, selection, and iteration. And you created different programs in Scratch, including an animation of a sunny day, and a short movie where Mary and John have a short chat. We're very happy to see how many people participated in the forum and the interesting discussions that came up. Well done, everyone. In this unit, you'll play further with loops using the repeat and repeat until blocks in Scratch, and you'll find out how to use events in your programs. You'll have a go at using multimedia to incorporate visual and sound effects. And you'll learn how to draw your sprite costumes or backdrops, record sounds and use the camera. All these elements will you give you many ideas for creating your computer games and animations. We'll create lots of fun games, including a variation of Fruit Ninja! And through these we'll start thinking about the requirements and the design of our programs, which are significant aspects of software engineering. So let's get started!