In the world of classic fighting games and arcade preservation, Fightcade 2 stands as the premier platform for online netplay. However, its greatest barrier to entry has always been a legal and logistical one: ROMs. While Fightcade provides the emulation layer and networking infrastructure, it does not supply the game data (ROMs) itself. The FC2 JSON Pack emerged as a community-driven solution to bridge this gap, offering a semi-automated method to download and organize the correct ROM sets directly from within Fightcade 2. Understanding the Problem: Mismatched ROMs Fightcade 2 relies on FinalBurn Neo (FBNeo) as its core emulator. To play a game like Street Fighter III: 3rd Strike or Garou: Mark of the Wolves , a user must manually locate, download, and place the correct, FBNeo-compatible ROM zip files into Fightcade’s ROMs folder. This process is fraught with challenges: ROMs from different sources may have incorrect checksums, missing files (e.g., parent vs. clone ROMs), or outdated versions. A mismatched ROM leads to desynchronization during online play, input lag, or the game simply failing to launch. What is the FC2 JSON Pack? The FC2 JSON Pack is not a standalone program but a structured data file—specifically a json (JavaScript Object Notation) file—that works in conjunction with a modified version of the Fightcade 2 client or an external script. The pack contains a curated list of direct download URLs for the exact ROM files required by Fightcade 2’s supported library. When activated, it instructs a download manager or the Fightcade client to fetch the correct ROM from a designated archive, rename it appropriately, and place it in the correct directory.