The trivia game Six Degrees of Kevin Bacon is based on a variation of the concept of the small world phenomenon and states that any actor can be linked through his or her film roles to actor Kevin Bacon. The game requires a group of players to try to connect any film actor in history to Kevin Bacon as quickly as possible and in as few links as possible. The game was played across various college campuses in the early 1990s. Its name is a pun on the concept of six degrees of separation. In 2007, Bacon started a charitable organization named SixDegrees.org.