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Most "all cards" solutions for the Power of Chaos series work by modifying the Windows Registry or replacing a specific save file ( system.dat ). Because the game stores your card progress in the registry rather than a traditional save folder, a simple script or file swap is usually all it takes to flip the "owned" bit for every card in the database. Top Methods to Unlock All Cards There are three primary ways to achieve a full collection:

Locate your game installation folder (usually in C:\Program Files (x86)\Yu-Gi-Oh! Power of Chaos\Joey the Passion ). Copy the system.dat file. Paste it into a separate backup folder on your desktop. Step 2: Download a Trusted Unlocker

: Normally, players only win 1 card for a Single Duel or 3 for a Match Duel. An unlocker saves dozens of hours of repetitive play.

Warning: Some antivirus programs flag Save Editors as "HackTools." This is a false positive because the tool is modifying memory, but use caution.

The drop rates were abysmal. High-value cards like Mirror Force , Dark Hole , and Red-Eyes Darkness Dragon had less than a 1% chance of appearing in their respective packs. To unlock all cards legitimately, players calculated it would take over — assuming you won every single one.

Fans created third-party save editors, cheat engine tables, and patched .exe files (often labeled as "unlockers" or "trainers") to bypass the grinding. These were shared on old forums (like GameFAQs, Reddit, or Yugioh modding communities) from the early 2000s onward. Using them:

Right-click the .reg file and select to view it in Notepad.

 
yu-gi-oh power of chaos joey the passion all cards unlocker