Replacing the existing system.dat file in the game folder with a "100% complete" version.
: On newer Windows versions (10/11), if your progress isn't saving or updating, check C:\Users\[YourUsername]\AppData\Local\VirtualStore\Program Files\Common Files\KONAMI\Yu-Gi-Oh! for a duplicate system.dat file that may be overriding your changes. yugioh power of chaos yugi the destiny all cards unlocker