Wallriding
You know, there are some levels out there that have corners that don't have any dirt, grass, or snow protecting the outer border of the corner. I find it rather interesting, but I found that you can cut corners that would require you to go at 30 mph at 110 mph instead. In case you're wondering how it works it's simple enough- find a corner that doesn't have any grass, snow, or dirt along it's proximity, then as you approach it, hug the outer wall of the corner and race around it with your car sliding against the wall at full throttle. You will lose some speed in doing this, yes, but not as much as you would if you slowed down to cut the corner normally. Plus, this is pretty easy to do, certainly easier than trying to cut the corner normally. If you are riding the wall at high speed and you can't turn away from the wall without slowing down, try steering in the direction you are turning- doing this will reduce the loss of speed while cutting the corner, but don't steer with so much force that you leave the wall.
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