Rockman 2: Dr. Wily no Nazo is the original Japanese version of Mega Man 2. The Japanese version of the game doesn't have difficulty settings, having its difficulty the same as the Difficult setting of the Western version, thus, being more difficult in comparison with the Normal mode of Mega Man 2.

Rockman 2: Dr. Wily no Nazo is the original Japanese version of Mega Man 2. The Japanese version of the game doesn't have difficulty settings, having its difficulty the same as the Difficult setting of the Western version, thus, being more difficult in comparison with the Normal mode of Mega Man 2.