The Buster Shot, Mega Buster, and Proto Buster abilities have all been updated. Previously, the three abilites were all clones with slight differences in power/accuracy. Now, the Buster Shot is a completely separate ability that deal moderate neutral damage has no special effects but great accuracy. This ability mimicks the standard buster shot used by Mega Man in the games without charging more accurately, I think. The Mega Buster and Proto Buster have also been changed, and are now two-turn charging attacks. The two abilities still have differences in power / accuracy like before, but they also offer differences in special effects. The Mega Buster raises defense slightly on every charge, while the Proto Buster raises attack power. With these changes come slightly modified sprites, and hopefully everything together enourage people to use both ability types in tandem rather than one or the other like before. Because of Buster Shot's new simplicity, all Robot Masters now start with the ability from the get-go in addition to their signature move.