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lestatdark said:
You've got to race and win multiple times on the same track, after a few times you'll be given a choice to change the difficulty on the Track settings, it starts at D and then goes all the way to S. So far i've unlocked Trial Mountain, Test Track and the Nurb.

What? For all the tracks?!

Thats long, but I'll get to work. I always love a tough race and the extra credits are tasty too!