What reading level is The Last Kids on Earth and the Monster Dimension?

The Last Kids on Earth and the Monster Dimension by Max Brallier is at a Level 5 reading level. Recommended for Middle Grades readers (Ages 9-12).

What age is The Last Kids on Earth and the Monster Dimension appropriate for?

The Last Kids on Earth and the Monster Dimension is recommended for Ages 9-12. HootRating: 10LP (Light — Physical). Content flags: Mild Peril, Fantasy Violence.

What genre is The Last Kids on Earth and the Monster Dimension?

The Last Kids on Earth and the Monster Dimension is fiction — Juvenile Fiction. Part of the The Last Kids on Earth series.

Does The Last Kids on Earth and the Monster Dimension have any content warnings?

The Last Kids on Earth and the Monster Dimension has a HootRating of 10LP (Light — Physical). Content flags include: Mild Peril, Fantasy Violence. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is The Last Kids on Earth and the Monster Dimension?

The Last Kids on Earth and the Monster Dimension by Max Brallier is 289 pages.

Reviewed by HootRated editorial · Last updated May 18, 2026

The Last Kids on Earth and the Monster Dimension

Max Brallier

The Last Kids on Earth and the Monster Dimension

Age Rating, Reading Level & Content Guide

by Max Brallier

The Last Kids on Earth · Book 7

Reading Level 5 10LP Ages 9-12 Balanced Read

The text is written at a 5th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is mild with minimal sensitive material.

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About This Book

Jack and his friends barely escape a dangerous fortress, but looming threats put their world at risk. With his Cosmic Hand gaining new powers, Jack embarks on a daring journey into the mysterious monster dimension to find the key to saving Earth. Adventure and courage collide as they face challenges beyond anything they've ever seen.

Themes

Adventure Friendship Fantasy World-Building Coming of Age

Quick Assessment

This is a Level 5 book with mild content intensity. Content themes include mild peril, fantasy violence. Written for readers ages 9-12.

Why we rated The Last Kids on Earth and the Monster Dimension 10LP

The Last Kids on Earth and the Monster Dimension is written at a Level 5 reading level across 289 pages. Strong independent readers around grade 6.0 can typically handle this book on their own; with parent or teacher support, The Last Kids on Earth and the Monster Dimension works for readers up to grade 7.0.

We rate The Last Kids on Earth and the Monster Dimension as 10LP ("Light — Physical") because the content sits in the "Mild" range — mild conflict — the kind a child encounters in normal play and sibling life. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly mild; no single dimension stands out as a concern.

Specific content flags noted by reviewers: Mild Peril, Fantasy Violence.

Thematically, The Last Kids on Earth and the Monster Dimension explores adventure, friendship, fantasy world-building, and coming of age — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Readers who like a steady plot with enough momentum to keep pages turning.
✓ Kids drawn to stories about adventure, friendship, fantasy world-building.
✓ Readers who fall hard for one book and want a long series to live in — there are 7 more books in the The Last Kids on Earth series.