While often viewed as a standalone film, Zathura is officially part of the Jumanji franchise.
When Sony Pictures decided to adapt the book, they faced a challenge. 1995’s Jumanji was a blockbuster phenomenon starring Robin Williams. Rather than filming a direct sequel, the studio opted for a "spiritual successor." The film adaptation keeps the core premise but changes the characters to the Budwing brothers, Danny and Walter. This allowed the film to stand on its own two feet without requiring audiences to have seen the first film, while subtly acknowledging the shared universe through a pivotal scene involving the discovery of the game. Zathura- A Space Adventure