Really Good. 10+
Jumanji: The next Level is rated 12A Due to Moderate violence.
Scenes include fistfights, including heavy punches, as well as use of nunchakus and bladed weapons. However, these scenes occur within a video game context.
There is also mild stuff in the film at a PG level:
There are sequences of mild threat, including people fleeing from wild animals, leaping across bridges over a chasm, and falling from heights. Mild sex references and innuendo also occur, including a reference to eunuchs having no testicles. Mild bad language includes use of 'pissed', 'shit', 'crap', 'ass', and 'bastards'.
The film is a great film for the family it is funny and has a great theme of the jungle. It carries on the same characters from the past movie however you can understand the movie without watching the last movie.
I say 10+ because of the Moderate Violence however it is your choice to let your kid under than 12 in the film.
But I say kids around 10+ would be fine, the film does not focus on violence but focuses on getting through the violence.
(Info goes to BBFC)