Mega Man 42 is made in the style of the original Mega Man for NES. Because of this many of the newer features are not to be found in the game, such as Mega Man's slide and charge-up buster. There are no E-tanks either. This to preserve the challenge of the game instead of watering it out with features that do not add to the gameplay, and instead detract from it by making it too easy. A Password system has been implemented however.
Roll is a playable character. She has a dash similar to X's in Mega Man X, and she can have four buster shots on the screen at a time. Her downside though is that she will take one more damage from all attacks.