What is the name of the final level in the original Mega Man game?

The final level in the original Mega Man is Dr. Wily’s Castle. It is the game’s concluding fortress sequence, entered after Mega Man defeats the six Robot Masters and returns to challenge Dr. Wily.

Released by Capcom for the Nintendo Entertainment System in 1987, the original Mega Man is structured around a set of selectable Robot Master stages followed by Dr. Wily’s Castle. The castle is not a single short room: it contains several consecutive stages filled with platforming challenges, hazards, enemies, and major boss encounters.

The fortress also revisits earlier battles by requiring Mega Man to fight the six Robot Masters again before the final confrontation. The last battle is against Dr. Wily, whose apparent alien transformation is ultimately exposed as a deception. Names such as “Wily Fortress” may be understandable shorthand, but “Dr. Wily’s Castle” is the established title associated with the game’s final level and fortress stages.