Amazon.com: Nintendo Gamecube Modem Adapter : Video Games
GameCube online functionality - Wikipedia
Buy GameCube Broadband Adapter Online at desertcartJORDAN
How to play GameCube online (GameCube + Broadband adaptor) (2018) - YouTube
4 wavebirds,1 cube,1 Gameboy Player,1 broadband adapter,1 1019 block memory card, and one mythical Component cable. As Star Fox would say...Mission Complete! Or Accomplished if you beat the levels special path lol.