. How to install psych engine | psych engine tutorial #1. Lol logo in middle of screen with backdrop, title screen part wont need source code lol. from venturebeat.com Lol logo in middle of screen with backdrop, title screen part wont need source code lol. Probably one of the main points of this engine, you can code in.lua files outside of the source code, making your own weeks without even messing with the source! (before download i got left and right mixed up i am very sorry about this!!!!!) i seen that no one made a video on how to do this so i wanted to help the pe.