By rewriting the game's code during "debug mode" AzzerUK turned off the game's disconnect timer so it never checked whether it was online or offline.

BBC: Gamer hacks SimCity to run offline

Wii U owners can find a tweaked version of the system menu hidden away in the system's backwards compatibility mode, featuring just enough updated code to block existing exploits.

ENGADGET: Wii Homebrew channel sneaks onto Wii U, sticks with what it knows