Mega Man dates all the way back to 1987, when the big-booted jet pack-wearing hero saved us from Dr. Wily for the first time. The game turned into a series, complete with spin-offs and ports galore. In 1993, Mega Man morphed into a second series called Mega Man X, in which about a dozen additional titles were made.
The first in the spinoff series, Mega Man X, launched on Super Nintendo (SNES) in 1993. Now, 21 years later, it is the sole Mega Man title available on the iPad.