Rockman 4 (Mega Man 4) takes place in an unspecified year during the 21st century, described as the year "20XX". One year after the events of Mega Man 3 and the supposed demise of the evil Dr. Wily, Dr. Light receives a letter from a mysterious Russian scientist named Dr. Cossack claiming that he is the world's greatest robot engineer. Cossack states further that he will unleash his army of robots upon the world as a test for Light to see which of the two of them is the better inventor. Light calls upon his own greatest creation, the hero Mega Man, to go after Cossack's Robot Masters. Rockman Complete Works is a remake of the first six Mega Man games with a lot of extras, remixed musics, and minor improved graphics (such as menu changes).
