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Slow down other drivers
On Mario Circuit 2, get a mystery box, if you have a green shell or banana, wait until the jump. Lay the trap in between the 2nd and 3rd zipper and, more likely than not, another driver will hit, miss the jump, and have to do it over. If you have a red shell, wait until the driver is just about to hit the jump and use it. If you have a mushroom, wait again until they are about to jump, use it, hit there back, and that will decrease their speed, resulting on them missing it, but you will still make it.