The BioShock Infinite Signature Series Guide is the official strategy guide for BioShock Infinite. It was published by BradyGames on March 26, 2013, in two editions: the paperback BioShock Infinite Signature Series Guide and the hardbound BioShock Infinite Limited Edition Guide, which features a new hardcover depicting a close up look at the Songbird, an exclusive 4” enameled metal replica keychain of the Freedom Key to Elizabeth's cage as well as an exclusive board game card from the upcoming board game BioShock Infinite: The Siege of Columbia.