If you have never read the book, this is a decent movie. It's well done and entertaining. However, if you like the book, this movie is a travesty. Even though the author Ernest Cline co-wrote the screenplay, it has only superficial resemblance to the book. I won't be specific because I don't want to spoil anything but absolutely NOTHING from the challenges in the book appear in the movie. It's as if they picked a few lines from the book, used the basic premise, and wrote an entirely different story. If you really like the book, stay away from this disaster.