In an announcement for the "Super Smash Bros." Invitational, a tournament which was held at E3 2014, Nintendo revealed an official GameCube controller adapter for the Wii U, which allows players to use GameCube controllers with the game, as well as a "Smash Bros." themed game controller. The adapter and controllers were released alongside the game and are also available separately, but vary depending on the region. The GameCube controller adapter has four controller ports and only works with "Super Smash Bros. for Wii U". Players can use up to two adapters on the Wii U. This adapter was later revealed to work with the Nintendo Switch in 2017.