Draw a keyboard character in the box, then press Go! Don't make it small or it won't work!! And please, draw the letter the way it's supposed to be drawn... :P It won't guess right every time, but it works alright. Enjoy! The most difficult characters for it to guess are P, A, :), Q, *, and f. Which one is hardest for you?
The thumbnail isn't updating. It's a Scratch glitch. The Scratch team is working on it. Here are all of the characters supported: abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ12 34567890!@#$%^&*()_+-=,.<>/?;:" Also, there are text emojis!: :P :D :) But they don't work super well. I'm sure there are other people who have made stuff like this, so credit to them for coming up with it first.