Mega Man 2 (stylized as Mega Man II) is a 1988 action-platform game developed and published by Capcom for the Nintendo Entertainment System. It was released in Japan in 1988 and in North America and PAL regions the following years. Mega Man 2 continues Mega Man's battle against the evil Dr. Wily and his rogue robots. It introduced graphical and gameplay changes, many of which became series staples. Although sales for the original Mega Man were unimpressive, Capcom allowed the team to create a sequel.
https://en.wikipedia.org/wiki/Mega_Man_2