A year after the destruction of Gamma and Dr. Wily’s defeat at the hands of Mega Man, the world is still at peace. One day Dr. Light receives a mysterious letter from an unknown scientist named Dr. Mikhail Cossack. Dr. Cossack plans to eliminate Mega Man and prove himself the greatest robot designer of all time. It’s up to Mega Man to save the day once again. Mega Man 4 provides action-based game play like the earlier games in the series. In Mega Man 4, Mega Man has the ability to charge up energy inside his Arm Cannon, allowing him to fire larger and more damaging blasts.