This is a peripheral which will allow you to use Nintendo GameCube controllers with Super Smash Bros. for Wii U. (Wii U console, software and Nintendo GameCube controllers sold separately.)
You can connect up to four Nintendo GameCube controllers using GameCube Controller Adapter for Wii U. The peripheral plugs into the Wii U console with two USB cables – you can use either the USB ports in the front or rear of the console..
You can use your existing Nintendo GameCube controllers to enjoy Super Smash Bros. for Wii U with the same feeling of control as Super Smash Bros. Melee and Super Smash Bros. Brawl.
The Nintendo GameCube Controller – Super Smash Bros. Edition shown is also planned for release on the same day: December 6th 2014.