Let the first set of UFO's blow the kegs then push the cannon beside Stinky right it will eliminate the mothership. Set the other cannons up to keep the red timer going, the two west facing ones go back and forth.
One red sphere goes over the tramp to kill the flames and Loof then eliminates it with the keg, the second red sphere that's produced goes on the conveyor stop button.
One metal box is used as a stopper for the blue tp and the other to cover the green button. That boulder behind the green gate is your second stopper.
Okay, the opening of this level's a bit of a stinker! Sorry.
