Today we will create a YouTube notification bar. You've probably seen it hundreds of times while watching your favorite YouTube channels. The idea behind this notification bar is quite simple. It should remind users to click the subscribe and bell buttons. Technically, it consists of a few sprites and very simple animations. Excited? Let's get to Scratch! Our first sprite must consist of the YouTube logo, a subscribe icon and a bell, and our Franky mouse (without eyes and mouth, because we will animate them in separate sprites). We need to have 3 costumes, each of them will represent a different state of our animation: all buttons disabled subscribe button enabled subscribe and bell buttons enabled We need to prepare elements for animation in separate sprites. For now, we need to create eyes, a mouth (with the default state, mouth open and smiling) and a cursor. Now it's time for the code blocks. Let's add some code blocks for the first notification sprite. When launch...