X-Men: Mutant Apocalypse (SNES). Fourth Password.

The eighth and hardest mission of X-Men: Mutant Apocalypse due to the not one but two insta-death lava sequences topped off by a randomly teleporting Apocalypse (who is also the hardest boss.) I went with Beast even though Wolverine can bypass the first lava sequence by climbing up the first hole in the ceiling, winding up in the cave area where I acquired the 3rd X for the extra life. With Beast, this section is actually skippable because there's five Xs (that I know of), and you only need 3 for an extra life. But, with the big blue furry intellectual, I never pass up an opportunity to walk on a ceiling.