The evolution of the original series, Mega Man X changed the game by introducing new mechanics, new characters, and a new take on the Blue Bomber. The addition of wall jumping and dashing propelled X into a class of its own, allowing the player to interact with practically every square inch of the entire game. Rousing rock tunes offset the frantic, fast-paced gameplay. Killer bosses (like Chill Penguin and Sting Chameleon) give you ample motivation to perfect your skills. X was the first — though certainly not the last — reinvention of Mega Man. It somehow managed to build upon the brilliant foundation of the original, and for that alone it more than deserves a spot on this list.