Gamecube Broadband Adapter Play GameCube games, such as Phantasy Star Online, with or against others over the Internet 10 megabit (10Base-T) or 100 megabit (100Base-TX) network cable, a broadband connection device and a valid account with a Broadband Internet Service Provider. Play GameCube games, such as Phantasy Star Online, with or against others over the Internet 10 megabit (10Base-T) or 100 megabit (100Base-TX) network cable, a broadband connection device and a valid account with a Broadband Internet Service Provider.