Called "Rockman" in Asia, and yeah, has a somewhat queer title here in North America. But they're only the sweetest sprite-based game series I've ever played. side-scrolling robot thing where you fight other robots and robot bosses. Each time you defeat a major robot, you get their weapon, and you can do certain things with certain weapons.

If you haven't played these you have never truely lived, so go drop everything and find an NES emulator.

as for "the definitive Mega Man game", all of the NES ones are awesome with the exceptions of I and V. the SNES ones are great too, but X2, X3 get kinda over-complicated. I haven't played any of the Playstation ones, but they look too different, its just not the same. really sweet animation though.