for play virtual games on wii you need a classic controler so on wii u for gamecube you may ne need the pro contoler. (nintendotoday.com)
I hope that they finally have an online mode for wii U games (disappointed with Nintendo Land in that regard). (mariopartylegacy.com)
All in all this is a great game for the price ($ 10 less than normal games) and is probably the BEST WII U game on the market at this time. (metacritic.com)