Decided to have another crack at the end of game boss. And failed. Again. Gah.
The main problem is hitting him invariably sends Mario rebounding down directly between both flippers, giving you no chance to survive (make your time – ©AYB 1997). And then you have to start killing him again. I can only get two hits in (I assume he needs three, going off other bosses) before the blue pipe barrier is gone and I fall through the hole accidently. Grr.