Mega Man X2

Mega Man X2 is the second game in the Mega Man X series. It's the first game to have C4 chip, to have 3D wireframe sprites.

Story
It has been six months since the end of Mega Man X, and with the loss of Zero the Hunters have turned to X himself to be their leader. Proving himself to be capable, for he had defeated Sigma himself, X and his Hunters were in the process of exterminating the various Mavericks.

The story itself settles X at the beginning of a factory where Mavericks are located, and so you, as X, must battle your way through that first portion, getting the hang of controlling X and defeating the numerous weak opponents.

If you succeed in defeating this opening level then you'll get to face off against numerous other stages, each one with their own boss, and watch as the story unravels before your very eyes.