In general, I would say that the Fazbear Frights’ 12+ age rating is a good guideline for Into The Pit. The book is written for an audience of teens and young adults, so it contains relatable ideas and themes for young readers at a level that's relatively easy to read and enjoy. That said, these stories do incorporate some aspects of body horror, light gore, child murder, and death, as well as some potentially upsetting or triggering topics such as body dysmorphia, eating disorders, and suicidal ideation. However, the content of Into The Pit doesn't contain anything more graphic or intense than the horror portrayed in the FNAF games themselves. I would put Into The Pit on par with similar anthology series like Scary Stories to Tell in the Dark, which I personally loved around age 10-12. These FNAF-inspired tales read like quick thrillers, so they're similar to the types of urban legends or ghost stories that get passed around a campfire or lunch table.