In addition to announcing the players and rules for the Super Smash Bros. Invitational during E3, Nintendo has announced that a GameCube adapter for the Wii U will be released for the game this winter. The adapter has slots for up to four GameCube controllers, and the adapter itself is plugged into the Wii U through USB. No word on whether or not the WaveBird controller will also work through the adapter. The adapter will be used during the tournament this June.
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