Codes and ciphers
Andrew Pennycook
Codes and ciphers
Age Rating, Reading Level & Content Guide
by Andrew Pennycook
The text is written at a 4th 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
Did you know codes and ciphers have shaped secret messages for centuries? This book reveals the mysteries behind writing and cracking these puzzles, unlocking hidden worlds of secret languages and clever devices. Understanding these secrets can turn anyone into a master codebreaker!
Quick Assessment
This engaging middle-grade fiction explores the fascinating world of codes and ciphers, introducing readers to secret languages and cipher devices. Suitable for ages 9-12, it encourages critical thinking and problem-solving without containing any intense content. It's an educational and entertaining read for children interested in puzzles and mysteries.
Why we rated Codes and ciphers 9C
Codes and ciphers is written at a Level 4-5 reading level across 152 pages. Strong independent readers around grade 5.5 can typically handle this book on their own; with parent or teacher support, Codes and ciphers works for readers up to grade 6.5.
We rate Codes and ciphers as 9C ("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, Codes and ciphers explores adventure, science & nature, and mystery — 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, science & nature, mystery.
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
9C — 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
- 0679508562
- Pages
- 152
- Publisher
- David McKay Company
- Published
- 1980
- Type
- Fiction