Did you know you can fall through the floor in the stage you get the air fuel grenades? It was hilarious (>.>) the first time I did it. Right after I got them I went to the place with like 70 eggs, and backtracked to the place with three rocks stacked together, then a small gap, and another rock. I jumped between, trying to get up to the three rocks to kill up high, and I fell through the opening and fell through the stage >.<
I'm going to reword this a bit and submit it as a glitch.
Wut? Did you figure this out on your own? Niiiiiiiiiice. I'm going to go dink around with this feature for a few minutes. Its amazing what can happen when your not even trying.