I wasn't sure if I actually wanted to include this one in the guide, but it employs an important concept that may come in handy in future levels. At first glance this layout may not seem like it will work, but the trick is that the oil that is deflected off the door and off the map is recycled back into the pump. This means that the same oil can than flow past the open door and into the target pool. So it's better to actually have oil flow off the map than lie somewhere it can't be used. Clever no?