is there Mario kart ds custom tracks mod that you can install on 3ds?
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Yep - CTGP-7! It should be available via Universal Updater, though be wary as it's a fairly large download. There are a tonne of extra tracks & features to make up for the wait though :)
Oops, just realised you said MK DS. My bad lol
yes! Google it and you will find it. There are beautiful tracks including MK8 ones. And yes I'm talking about Mario Kart DS.