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I assume you need either a 56k adapter or a broadband adapter in each Gamecube, and a cable of some sort (ethernet, maybe?) to connect them together. Personally I don't think it's worth the bother. The adapters are like £40 each for starters. Plus it seems to be hard to get hold of them now, which makes sense as I doubt that more than a handful of people even bought them in the first place, what with the only online Gamecube game being Phantasy Star Online I & II.