What reading level is Planet of the Cublix?

Planet of the Cublix by Clotilde Bruneau is at a Level 3-4 reading level. Recommended for Middle Grades readers (Ages 9-12).

What age is Planet of the Cublix appropriate for?

Planet of the Cublix is recommended for Ages 9-12. HootRating: 8C (Clear).

What genre is Planet of the Cublix?

Planet of the Cublix is fiction — Juvenile Fiction. Part of the Little Prince series.

Does Planet of the Cublix have any content warnings?

Planet of the Cublix has a HootRating of 8C (Clear). No specific content flags noted. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is Planet of the Cublix?

Planet of the Cublix by Clotilde Bruneau is 48 pages (approximately 2,257 words).

Reviewed by HootRated editorial · Last updated May 18, 2026

Planet of the Cublix

Clotilde Bruneau

Planet of the Cublix

Age Rating, Reading Level & Content Guide

Book 19

by Clotilde Bruneau

Little Prince

Reading Level 3-4 8C Ages 9-12 Balanced Read Page-Turner

The text is written at a 3rd grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is gentle with no concerning themes.

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About This Book

On a smog-filled planet, Lux the blacksmith mistakenly thinks the robot-like Cublix are thieves, causing fear and division. The Cublix hide indoors, unable to recharge their batteries, while Lux keeps creating smog to protect himself. The Little Prince arrives to bring understanding and help everyone find a way to live together in harmony before their energy runs out.

Themes

Friendship Family Science & Nature Fantasy World-Building

Quick Assessment

This is a Level 3-4 book with gentle content intensity. No notable content concerns flagged. Written for readers ages 9-12.

Why we rated Planet of the Cublix 8C

Planet of the Cublix is written at a Level 3-4 reading level across 48 pages (approximately 2,257 words). Strong independent readers around grade 4.2 can typically handle this book on their own; with parent or teacher support, Planet of the Cublix works for readers up to grade 5.2.

Read aloud, Planet of the Cublix takes about 15 minutes, which fits within a single read-aloud session.

We rate Planet of the Cublix as 8C ("Clear") because the content sits in the "Gentle" range — no conflict beyond everyday childhood experiences. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly gentle; no single dimension stands out as a concern.

No specific content flags were raised by community reviewers, which is consistent with the gentle intensity score.

Thematically, Planet of the Cublix explores friendship, family, science & nature, and fantasy world-building — 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.
✓ Reluctant readers who need fast-paced, hook-heavy stories to stay engaged.
✓ Kids drawn to stories about friendship, family, science & nature.
✓ Readers who fall hard for one book and want a long series to live in — there are 14 more books in the Little Prince series.