In my opinion, the best classic series game. The only problem is that the game design will deliberately to things to kill you when you don't know they're there rather than giving you any chance to react or deal with it, but even then I understand that because this was a "return to form" and most people think of Mega Man as the kind of game that did that. Level design is otherwise fantastic, the enemies are really fun, the boss fights are the best in the series, the music is great, and this is the best set of weapons the series has ever given us. The endless mode existing is just icing on the cake.