The fourth entry on the series does not innovate that much but keep the most like positive points of the previous ones, it's almost a solid mid game, I like the robot masters' designs here, the charged buster is a great addition, music is not greater than 3, difficult is ok, Wire item helped me a few times but not a game changer, the plot is a high point for me, the Cossack/Protoman twist is pretty well developed, Willy stages were a little bit of forgettable, the weapons are one of the best on the series. Overall, a truly Mega Man game.