A Mystery Detective Adventure through
Geometry
LEARNER CATEGORY
Secondary School (Grades 6-10)
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, Terms of Use
Copyright © 2026 by Playbook Pedagogy Labs. All rights reserved.
This resource is licensed for use by one purchaser only.
You may:
1. Print or use this resource for your own classroom, home, tutoring
sessions, or homeschool setting.
2. Make copies for the students or children you personally teach or
support.
The one exception built directly into this resource is classroom and
homeschool use: a single purchasing teacher, lecturer, or parent may
reproduce the student-facing pages of this gamebook for use with their own
students or their own child, within their own classroom, tutoring practice, or
household.
You may not:
1. Share, email, upload, or distribute this resource to other individuals or
organizations.
2. Post any part of this resource online, including on websites, social
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Resell, redistribute, modify for resale, or claim this work as your own.
For inquiries:
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, Teacher Notes
The Shape Shifter Mystery covers a complete first pass through core
secondary geometry: angle sum rules for triangles, triangle congruence
criteria, parallel line angle relationships, the angle-in-a-semicircle circle
theorem, and composite area calculations.
Each case opens with a Discovery Briefing introducing the concept from first
principles, so no separate lesson is strictly required beforehand. A Player
Information block (Name, Grade/Class, and Date) appears at the start of
every mission, allowing any single case to be printed and taught entirely on
its own without requiring the whole book.
Expect approximately ninety minutes to two hours of engaged work for a
typical student. Every puzzle answer, along with a full worked explanation,
is provided in the Complete Answer Key page.
This gamebook is built to align with US Common Core, UK GCSE,
Australian, Canadian, European, Asian, and International secondary
mathematics curriculum standards.
The Shape Shifter Mystery includes a Certificate of Achievement. Upon
successful completion of all 5 cases, the certificate may be signed and
awarded by the teacher.
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, Welcome to the Adventure
The school's Geometry Garden, a small courtyard filled with carefully
measured shapes built by last year's graduating class, has been rearranged
overnight.
Every angle has shifted. Every triangle looks subtly wrong. A single chalk
drawing on the courtyard wall shows a masked figure holding a protractor,
signed only, 'The Shape Shifter.'
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