It's one of the most confusing parts of RetroPie.įinally I came across this helpful Reddit post that had a no bullshit answer and actual instructions of what to do and where to place the files.ĮDIT: Here it is summarized below. It seemed like every time someone tried to explain it on a forum or blog post I left feeling more confused or discouraged, so I put it off. Like many other poor souls not privy to MAME ROMs and emulators I struggled to get my ROMs to work.