http://nintendoevery...pter-for-wii-u/
gamecube_controller_adapter Nintendo has provided a first look at some sort of GameCube controller adapter for Wii U in its “Super Smash Bros. Invitational @ E3 2014″ video. The company said in a follow-up tweet that the new Super Smash Bros. will be playable with all GameCube controllers:
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