Game Boy adaption of "Mega Man 4" in which Dr. Cossack, a Russian cyberneticist, has created eight Robot Masters specifically designed to destroy Mega Man.Game Boy adaption of "Mega Man 4" in which Dr. Cossack, a Russian cyberneticist, has created eight Robot Masters specifically designed to destroy Mega Man.Game Boy adaption of "Mega Man 4" in which Dr. Cossack, a Russian cyberneticist, has created eight Robot Masters specifically designed to destroy Mega Man.