Based on the book by Ernest Cline, this film is about a dystopian future world where everyone is obsessed with a computer challenge that has been running for years with a prize of huge wealth. The challenge is to know everything about the popular culture loved by the creator, mostly 80s stuff.
While in the book, I found the constant references to the 80s a bit much, it worked really well in the film. And being directed by Stephen Spielberg meant it was had a lot of the feel of the popular culture that it was referencing, It was pretty decent.