I just bought a used copy of Mario party 7, and on the back it says you can play 8 players simultaneously! How is that possible? Is there some kind of GameCube multi-tap that I don't know about? I tried googling this, but all the results I get have to so with the Wii U's GameCube controller adapter ...

Hi, I'm a competitive smash Bros player from Montreal, and an aspiring indie game developer.