Ready Player One is a movie for kids, or, specifically, one kid: the kid Steven Spielberg once was, who grew up, became one of the greatest directors of all time, and then treated himself to a giant VR playground filled with massive robots, zero -
gravity dance clubs and time - travel deus ex machinas that look like Rubick's cubes but are named after Zemeckis.
The biggest example was the Distracted Globe, a zero -
gravity dance club that Penn, obviously, assumed couldn't be in the movie because it would be too expensive.