Eh. I booted up my Mario Kart DS cart in my DS, linked to WFC and chose rivals, regional (AUS), worldwide, and it never finds anyone... and even says "you may not be able to gather 4 players"... I SavSende'd it over to my R4 eventually, and same result. Does anyone actually play it on WFC, as I said? 2 years old, sure, but I think it's a gem of a game. I can't be bothered getting my friend code, and I don't go on WFC much but meh.