One GameCube Controller Adapter can have up to four Nintendo GameCube Controllers connected. With two adapters, you could even use up to eight controllers at once!
• This accessory is designed for use with Super Smash Bros.™ for Wii U. It cannot be used with any other Wii U software, or with any Wii software.
• This accessory must be connected to two USB ports on the Wii U console. If there are not enough free USB ports, you can use a commercially available self-powered USB hub which functions with the Wii U console.