Keiji Inafune actually had to create Mega Man 2 on his own time, to a certain extent. The original game hadn't been successful enough to warrant a fully produced sequel, but he so wanted to create another Mega Man title, that he was given permission to work on it so long as it didn't interfere with any of his other scheduled work.
Mega Mans creator Keiji Inafune considers Mega Man 2 his favorite Mega Man game. Thanks to its creative levels, cool weapons, excellent bosses and fantastic music.
Mega Man 2 was voted #32 in the Top 100 Games of All Time poll published by Game Informer Magazine (Issue 100, August 2001).