10 Video Game Bosses Beaten By Their Own Arenas
9. Crocomire (Super Metroid)

Super Metroid's Crocomire has at least eight eyes, but sadly for the scaly sub-boss, none of them in the back of its head. If they were, Samus Aran's adventure on Zebes would almost certainly have came to a nasty conclusion in the depths of Brinstar.
No matter how many missiles the heroine launches at the reptilian rascal, they alone are not enough to send it packing to the great bayou in the sky. Stay in one spot, and Crocomire will gradually march upon the galaxy's best bounty hunter, eventually making her Varia suit about 200% more breathable thanks to a massive wall of spikes.
Unlike so many bosses who fall through their metaphorical coffee tables, those spikes are not actually the solution. The trick is to keep blasting Crocomire's maw, forcing him to take a step back until he eventually rests his scaly butt on a flimsy bridge. It collapses under the weight of the Norfair nasty, who, suddenly regretting one too many snacks, crashes into a pit of hydrochloric acid to a surprisingly grisly death.