The Case of the Seven Reflections: A Fairy Detective Optics Mystery

An interactive optics mystery for kids ages 9–12 who like reading and stories.

Your child plays a fairy detective investigating a stolen emerald from the seven dwarves' cottage. Each dwarf witnessed the theft — but each saw the thief reflected in a different kind of mirror, so each gives a different description of who they saw. To untangle the testimonies and identify the thief, your child has to understand how plane, convex, and concave mirrors actually behave.

The optics is built into the mystery rather than taught alongside it. The dwarves' contradictory accounts only resolve once you understand which mirror types invert images, which change apparent size, and which can do both depending on distance. Along the way, the queen's magic mirrors explain concepts in conversation, the classic "why does a mirror reverse left and right but not up and down" riddle gets answered, and a spoon (concave on one side, convex on the other) becomes a hands-on tool for experimenting.

What's covered

• The three main mirror types and how each transforms an image
• A brief introduction to how light reflects and how our eyes interpret it
• The left/right reversal puzzle and what's actually going on
• Optional links to a free PhET ray-diagram simulation for kids who want to dig further

This is a companion to a class or unit on optics, not a complete curriculum. It works alongside any introduction to reflection and mirrors.

What you'll receive A PDF with a link to the game's webpage. From there your child can play directly in any browser (phone, tablet, or computer) or download an offline version for laptops and desktops.

Practical details

• Plays in about 1–2 hours, in one sitting or several
• Reading-heavy — best for kids who enjoy stories and text
• One mystery with a single solution; not designed for replay
• More fun with a few household items on hand: a mirror, a reflective spoon (the more spherical, the better), and paper and a pen for detective notes. The game works without them, but they help

Accessibility

• The game is entirely text-based and reading-heavy. Kids who prefer audiobooks or have reading difficulties will likely need a parent or sibling to read aloud.
• Self-paced throughout — no timers, no audio cues, no fast reflexes required.
• Plays with mouse, trackpad, or touch. No keyboard shortcuts required.
• Text size scales smoothly across phones, tablets, and computers, with a comfortably large minimum on small screens.
• The hands-on spoon experiments are optional — the game can be completed without them.
• Not formally tested with screen readers.

A note about the story The mystery is loosely inspired by the public-domain Snow White fairy tale. The princess character is named Fay, and the setting is an original take on the seven dwarves' world — no affiliation with Disney or any other adaptation.