Ready Player One does not have a post-credits scene, despite the fact that it very well could have.
Ernest Cline, the author of Ready Player One, confirmed late last year that he’s working on a sequel to his 2011 sci-fi novel. Given that he co-wrote the screenplay for the Steven Spielberg-directed film adaptation, he presumably could have worked in a little scene after the credits to hint at what the future might hold.
The author revealed he’s working on a sequel to his Ready Player One book during a live interview (via ScreenRant) in December promoting a trailer premiere for the movie. “It’s true,” he said. “I can’t talk about it too much, but there’s no better inspiration for a writer
Source:: IGN -Reviews