I'm convinced this is impossible.
No matter what I do, I always come within one bubble of losing. Every other round is cake, even the rounds after it are pie. But this one level... ugh.
Does anyone have any tips for getting around it? I've tried shooting the furthest possible bubbles, and shooting the closest bubbles, both with no luck. I'm really interested in finding out what the key is to beating this round on the hardest difficulty.