Uh, where are you in that level, exactly? I just got this game today (early Christamas), and already i'm somewhat far. So, which part of the level are you at?
If you're at the one part where there is this really long conveyor belt that takes you to this non-animated machine, then i can help. It took me a while, as well. I believe that oart has something to do with, like, advertisement slime or something.....
Wait, I think I may know which part you are at. is it the one where Donkey Kong has Frink and goes into a pipe and that pipe he just went into is surrounded by a whole bunch of other pipes, all multi-colored? Cause you'll need Lisa's telekenesis and bart, uh, grappling hook-thingy.
But just respond back and I should be able to help you.
"Do or do not, there is no try" -Yoda
I'm gone...