The gamecube controller adapter is your best choice to play Super Smash Bros on wii u.Up to eight GC controllers use at the same time(Need two adapter). Support Wii u,PC,Switch and Mac.Easy switch the wii u/pc button located on the side,No driver need.Just fun play with the gamecube adapter. Note:If you want to play on switch,The system need up to 4.0 and the Gc controller's button is less than switch controller.So,some game's fumction may not work.