Murder in the Dark, Mafia, Hide-and-Seek: these free-to-play games have long been part of the neglected history of street games. Ludocity is a site dedicated to real-world street and social games and houses a list of game rules and events.
Some of the games on Ludocity overlap with theatre, painting, dance, and other art forms. Some of them use balloons, lumps of coal, huge sheets of paper, mp3 players, elaborate costumes, and short-range radio broadcasts.
Their game list includes mostly quirky games, like Privacy is Dead, which has players trading personal data for points, and Poets versus Policemen, which has policemen players trying to catch poet players in the act.