With the exception of the first and last level of the game, the other levels always have a drunk character.
While this is the third game in the series, it is has been considered the game to truly put more emphasis and focus on story as opposed to the previous two games. Whereas the previous games were more goal-driven alongside the funny characters and expansive atmosphere and worlds, this game took the best elements of the previous game and gave them a sense of continuity, creating a narrative, with more attention given to real scientific theories in addition to the more cartoonish and zany nature of the games.