Mega Man 5 Part 4: Stone Man Stage
2Stone Man is just what he is: A Man made of Stone. He looks a bit like Guts Man of Mega Man 1, and both of them even have to work in mountains.
He's tough and heavy, but he can jump surprisingly high. A strong impact, like falling from a great height, can make him collapse like the stack of bricks that he is, but he can quickly and literally put himself back together.
It is because of this that the Napalm Bomb is his weakness, though he can't be hurt at all while he's nothing but a pile of himself. When Mega Man defeats him, he gains his weapon: Power Stone.
It's important to remember where the "G" in MEGAMANV is here. It's blocked off by a secret passage. I think this was the only letter I originally missed in my playthrough of this game a 1 or 2 years ago.
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Did you know that Capcom later made a fighting game called "Power Stone"? It even has a sequel!