Click the scratch cat, and it's costume will change! Pretty simple, right? Here comes the twist: See inside! The code is invisible. How, why, wha-? Here is how you can do it! Step 1: Type "%15" in the search bar, press search, then copy Step 2: Open a new project, and make a new message Step 3: Paste in the weird symbol you copied Step 4: Add the code you want, save and refresh the page And boom! That's the magic! But be careful, now you can't edit the code, so don't use it in your projects, unless it's the final version!
@squidologist made a project about this topic https://scratch.mit.edu/projects/1192730565/