After finally finishing this game, it became evident that this is one of the best NES games, and it's my favorite NES one. The controls are incredibly smooth for its time, and the music is incredibly good. The story is nice and simple. A negative I have for the game though is that it's really difficult, especially in the final two worlds. What makes it much harder is the fact that the last 2 bosses take you back to the first level of their world if you die. It's at that point where I started to use save states. With or without savestates, it's still an enjoyable game, with the first 4 world's as well as the first 2 levels of world 5 being the strongest parts of the game.