Back up your original system.dat file by renaming it to system_backup.dat .
Pro Tip: Search specifically for the game you are playing. A save file for Kaiba the Revenge will not work for Joey the Passion unless you are using a mod that combines the games. Yu-gi-oh Power Of Chaos All Cards Save Game
Many modern players encounter issues running the game on Windows 10 or 11. Sometimes the game fails to create a save file on its own, resulting in progress loss. Downloading a pre-made system.dat file acts as a fix to ensure the game saves progress and recognizes the unlocked content. Back up your original system
This article dives deep into what these save files are, how to install them safely, where to find them, and why they transformed the game from a chore into a sandbox. Many modern players encounter issues running the game