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Is it like Mario Kart DS where you can just search for others to play with or play with people you have registered with friend codes? Or do you have to have friend codes to play online?

I was thinking of getting this game so please help me out

No, there are random matches.

You can get peoples FC to vs them, and regular matchs are set up randomly.

And you can get those random people to add you as rivals.

good. thanks!