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The GamePad transforms the traditional Call of Duty experience through "SecondScreen" functionality.
Ensure you have a USB storage device formatted for the Wii U (the console will prompt to format it if it is fresh). Note that formatting the drive for Wii U use will erase all existing data on that drive.
Wii U discs are prone to disc rot due to their proprietary manufacturing process. A dump is a lossless, encrypted copy of the digital or disc version, ensuring that the game remains playable indefinitely on your console or Cemu emulator.