I was experimenting with level 10, and I think sub 20 is possible with the right starts. This update should go on the strategy guide btw. Start by charging a wheelie boost, and release it just before the ice. Continue driving a wheelie (no boost) as it is faster than just driving up the loop, and flip on to the wooden thing while charging a boost. This is done quickly by using the up arrow key for acceleration and the S key for brake, allowing you to change angles mid air. Release the boost and immediately charge another one mid air, do not flip off of the wood. Do a wheelie into the rocket. This next part is the most difficult part of the level, you need to brake on the ice in a very specific way so that you break all but the top piece of ice, land a flip, and land to where your front wheel will not hit the ramp. Flick off of the ramp, and go up the rocks with the front wheel barely off of the ground. DO NOT CHARGE A BOOST BEFORE THE ROCKS. Do a front flip off of the rocks and make sure that you land in such a way that your back wheel hits the corner and you front wheel doesn't touch the rocks at all. I find it quicker to continue holding accelerate during this part. If this is done perfectly it should get sub 20. So far, I have a 20.11. It makes more sense if you watch the video.