Despite being less popular than the Xbox 360/PS3 versions, the Ghosts Wii U ROM is available on torrent sites and ROM archives (e.g., Internet Archive – though often removed after DMCA takedowns). Typical file sizes:
Extinction mode, in particular, is a cult favorite. Instead of the traditional Zombies, you fight off hordes of "Cryptids" while protecting a drill. It provides hours of solo or local split-screen content that justifies the download. Safety and Legality call of duty ghosts wii u rom
If you are looking to play a digital backup (ROM/ISO) of the game: Despite being less popular than the Xbox 360/PS3