Finish in first place in all cups and stunts in Career mode. Alternately, reach a 97% completion.
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Unlock the Speedway Left and Speedway Right. Use the Flatmobile and keep hitting the gas and boosting it by nitrous. Hold [Up] and it will reach speeds of 550 kph.
Get one of the more stable cars (for example, the AfterBurner) and drive straight through the yellow barrels. Do nothesitate. Straighten up near the end. This may require a few attempts.
Win the Race Finals.
To get a really good score in Stone Skipping, use thefollowing steps. Do not start out going forward. Instead, startout backwards until you hit the wall behind you. Go to the endof the diving board and launch your driver at about 40 degrees.Keep trying to get all either "Perfects" or really good"Greats" and you might be able to bounce over the walkwaythat blocks you from going any further (not the walkway directlynext to where you launch your driver, but the one near the end).