Please read the instructions by pressing any of the mentioned keys: Z, A, space or the up key. You can also click the screen. Just a text box engine. It works by creating a bunch of clones that represent the letters. That means there is a costume for each character. If there is not a character for something put into the text box function, the clone will switch to the same costume as the box itself. Don't use things like capital letters, because I didn't make those as a costume. If you would like to see how this could be used in a game, I recommend you check out my "Text Box Demonstration" No need to give credit. It would be appreciated though.