Zathura: A Space Adventure (2005)
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Both Jumanji and Zathura are based on novels by Chris Van Allsburg; in the book version of Zathura, the Zathura board game is found inside Jumanji, but an astronaut living inside Zathura claims to have created Jumanji.
Zathura director Jon Favreau discouraged the notion that the film is a sequel to the earlier film Jumanji, having not particularly liked that film. Both he and Chris Van Allsburg stated that Zathura is very different from Jumanji. No characters from Jumanji appear in Zathura.
However, reviewers disagreed, saying the films were very similar, one dismissing Zathura as "Jumanji in space without Robin Williams." Edit (Coming Soon)