@Solid-One That works! The Port itself doesn't seem to work very well yet, and I only have Doom Shareware as an option despite having all the WADs in place in the Doom directory. But I haven't looked at this properly yet, and the change to the location within the Script Module worked a treat. Thank you!

@jcook84 With all my testing and dedication to getting our goal with Doom split-screen on RetroPie working, i was expecting it to run without any conflicts with other doom ports. I did not expect that a pi zero would be able to run it. Thanks to you too, you kept the idea alive.

One thought to think of is that ReMooD might be able to run on the latest RetroPie version just like Doom Legacy, since ReMooD is an enhanced version of Doom Legacy and we know that ReMooD enables 4 player split-screen instead of Doom Legacy's 2 player split-screen mode.