A pervasive game is a video game where the gaming experience is extended out in the real world,[1] or where the fictive world in which the game takes place blends with the physical world.[2] The "It's Alive" mobile games company described pervasive games as "games that surround you",[3] while Montola, Stenros and Waern's book, Pervasive Games defines them as having "one or more salient features that expand the contractual magic circle of play spatially, temporally, or socially."[4] The concept of a "magic circle" draws from the work of Johan Huizinga, who describes the boundaries of play.[5]