Steven Spielberg ranks Ready Player One as his third most challenging film

Steven Spielberg ranks 'Ready Player' One as the third most challenging film he's made in his award-winning career. The veteran filmmaker is gearing up to release the sci-fi action film, which is based on Ernest Cline's 2011 novel of the same name, and is set in a near-future dystopian Earth where people spend most of their time in an interconneced virtual space called the Oasis.