This really only wiggles if you put it on Turbo Mode (Hold the shift button then click on the green flag on computer. For Mobile hit see inside then hit Edit then click on Turbo Mode) Hit space to clear the screen. (Hold Space for it to not get longer but wiggle around or see Wiggling Rainbow by @Lirey, https://scratch.mit.edu/projects/356886403/ )
V.1.5 I made it so non-turbo mode is faster to generate. This is 100% Pen made by @BusyBox This uses your username to make the square of the Rainbow bigger or smaller.(The Thumbnail was at a size 7 box) Feel free to remix this.