Nostalgia is an incredibly powerful force. Catching a certain scent in the air or hearing a few bars of a familiar song can instantly transport us to another time and place. Nostalgia can make us melancholy, it can make us incredibly sad, or it can fill us with a childlike type of happiness. Modern videogame developers and publishers are well aware of this fact, regularly trotting out the characters, visual styles, and gameplay types its audience first encountered in their youth as a shortcut to sales success. Whether these call-backs to the past are innovative or lazy, though, makes all the difference in whether the ensuing game is worthwhile.