Certainly! Here’s a helpful overview of — what they are, why they matter, and how to use them effectively. What is a 1G1R ROM Set? 1G1R stands for “One Game, One ROM.” It’s a curated collection of ROM files for a given gaming system (e.g., NES, SNES, Game Boy) that includes only one version of each unique game title , eliminating duplicates, regional variants, revisions, and alternates.