I watched episodes 1-3 of griffpatch's text engine tutorial so you don't have to.

Instructions

I've included all the code from the @griffpatch text engine series, plus some of my own tests so delete the "when green flag clicked", "when I receive start" and "when I receive test" scripts. I recommend just skimming through the video series so you actually know what you're doing. https://www.youtube.com/playlist?list=PL6L6s-Pe6s9V56fcrkDCFxi0KLABomGZ1