Do not open!
Mark Parisi
Do not open!
Age Rating, Reading Level & Content Guide
by Mark Parisi
The text is written at a 6th 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
What if you found a secret note saying an alien is watching you, but no one else believes you? Marty Pants does, and now he’s on a mission to save the world—all while trying to survive middle school! Can one quirky artist really stop an alien invasion before it’s too late?
Themes
Quick Assessment
This middle-grade fiction book follows Marty Pants, an imaginative and observant boy who discovers a mysterious alien threat that only he can see. Filled with humor and relatable middle school situations, it explores themes of friendship, creativity, and perseverance. Suitable for ages 9-12, it offers lighthearted fun with some suspense but no intense content.
Why we rated Do not open! 11LE
Do not open! is written at a Level 6 reading level across 250 pages. Strong independent readers around grade 7.0 can typically handle this book on their own; with parent or teacher support, Do not open! works for readers up to grade 8.0.
We rate Do not open! as 11LE ("Light — Emotional") 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.
No specific content flags were raised by community reviewers, which is consistent with the mild intensity score.
Thematically, Do not open! explores humor, friendship, middle school, adventure, and creativity — 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 humor, friendship, middle school.
Maybe not for
- ! Readers looking for something heavier — this is a gentle, low-stakes story by design.
For Parents
Content Intensity
11LE — Light — EmotionalLight conflict or tension. Mild peril resolved quickly.
Was our "Mild" 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
- 9780062427762
- Pages
- 250
- Publisher
- HarperCollins
- Published
- 2017
- Type
- Fiction