This weekend, my wife and I went to Sleep No More, a theatrical production in New York City produced by Punchdrunk and EMURSIVE. It would be incorrect to call it a play, or to say that I went to “see” it, because it isn’t a traditional sort of play, nor is it something you watch passively; however, there is definitely a strong element of real play in it, for both the audience and the actors.
The Wikipedia page calls Sleep No More an “immersive theatre installation,” which is an accurate, if not necessarily accessible description. Some reviews have likened it to video games like BioShock or Choose Your Own Adventure books, and one of my friends compared it to a holonovel on Star Trek, an interactive book that plays out on a holodeck and makes the “reader” part of the story. I would go one step further and compare Sleep No More to novels, period.