39-Story Treehouse
Andy Griffiths
39-Story Treehouse
Age Rating, Reading Level & Content Guide
Mean Machines & Mad Professors!
by Andy Griffiths
The text is written at a 7th 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
What if your treehouse kept growing taller and taller, all the way up to 39 stories? Imagine bouncing on the world's highest trampoline, roasting marshmallows inside a volcano, or swimming in a chocolate waterfall! But when a new invention promises to write their whole book, Andy and Terry's adventure takes an unexpected twist—what could possibly go wrong?
Themes
Quick Assessment
This middle-grade fiction book follows Andy and Terry as they expand their fantastical 39-story treehouse filled with imaginative and whimsical adventures. Suitable for ages 9-12, it encourages creativity and humor while featuring themes of friendship and storytelling. The story includes light fantasy elements and playful scenarios without any intense content, making it appropriate for its target audience.
Why we rated 39-Story Treehouse 12C
39-Story Treehouse is written at a Level 7 reading level across 353 pages. Strong independent readers around grade 8.0 can typically handle this book on their own; with parent or teacher support, 39-Story Treehouse works for readers up to grade 9.0.
We rate 39-Story Treehouse as 12C ("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, 39-Story Treehouse explores adventure, imagination, friendship, and humor — 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.
- ✓ Kids drawn to stories about adventure, imagination, friendship.
Maybe not for
- ! Readers whose emotional readiness lags behind their decoding skills — this book's intensity outruns its reading level, a classic "gifted kid" mismatch.
For Parents
Content Intensity
12C — ClearNo conflict beyond everyday childhood experiences. Safe for sensitive readers.
Was our "Gentle" content intensity rating accurate for this book?
Reading Insights
Hook Factor
3/10A steady, thoughtful read that rewards patient readers.
Discussion Potential
1/10A lighter read — great for independent enjoyment.
Book DNA
Multi-dimensional content fingerprint
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Details
Book Length
- ISBN
- 9781250077493
- Pages
- 353
- Publisher
- Feiwel & Friends
- Published
- 2015
- Type
- Fiction