For the SDS Loudness Lollapalooza! http://scratch.mit.edu/galleries/view/119329
The louder you are, the more the car goes, but if you don't watch out it zooms across the screen. Don't bump into hedges or the edge while you're getting to the goal. Point in the right direction with the arrow keys.
Credit to roosterman3 for the car. He can make you art too! http://scratch.mit.edu/projects/roosterman3/1688526
Credit to Caulfield for the hedges. http://scratch.mit.edu/forums/viewtopic.php?pid=763763#p763763