Ready Player One: Ernest Cline on how his gamer fantasy became a Spielberg film

It took Ernest Cline 10 years to write Ready Player One. There were times he thought he would never finish the manuscript, let alone publish it. But the novel, mostly set in a global online pleasure world called Oasis, went on to become a bestseller and was translated into more than 20 languages. Now a film adaptation by Steven Spielberg is in cinemas – a real-life geek-to-riches drama so reflective of the book's plot it seems almost unfeasible. The sci-fi story's setup is simple.