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Endgame Interactive was an online episode off the old debunct tv series "Endgame" that integrates fans’ Facebook friends into a “choose your own adventure” mystery. Users interact with the original drama series’ star brilliant chess master Arkady Balagan. In the show, Balagan becomes a prisoner in his luxury hotel, terrified to step outside when traumatized by the murder of his fiancée.To pay his hotel bill, Balagan starts solving mysteries using an unlikely band of hotel employees and chess fanatics to do his legwork. On the site, users join Arkady’s investigators and participate in putting the pieces together to crack the online mystery.

The overview is courtesy of secret location.
http://www.thesecretlocation.com/

The original site is long gone but the creator and makers of the site - secret location has archived it onto their own site. You can play the game here.
http://endgame.thesecretlocation.com/