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This was an add-on that allowed GameCubes to connect to other GameCubes with [[Wikipedia:Modular connector|RJ45 cables]]. A router can extend connection capabilities. ''Mario Kart: Double Dash!!'' only allowed LAN connectivity with up to eight GameCubes while ''Phantasy Star Online'' took it a step further to allow to connect to official game servers provided by SEGA, which is now offline forever. ''Kirby Air Ride'' and ''1080° Avalanche'' also support this adapter. This feature was unavailable in the [[Wii]]'s GameCube mode despite having 802.11 b/g connectivity built-in and a USB LAN adaptor released officially by Nintendo. [[Dolphin]] seemingly has support for the Broadband Adapter.