When you add a subtitle to a game, it's likely to draw attention to a particular aspect or to get people to think a certain way. With this game's title, you're probably thinking that there's going to be a lot of science involved. In a sense, that is very correct since the gameplay has always been based on physics. A lot of familiar elements are there, but new ones are introduced to help expand the core of the game. It maintains everything that the original game had which means there's more opportunity to play around and experiment with the new levels.