Prism Shift: Optics Puzzles

A single beam of light, a handful of mirrors, and a target waiting in the dark. Turn one mirror a few degrees and watch the whole path change.

Prism Shift is a puzzle game and a pocket optics lab in one. Every beam follows real physics: it reflects at the same angle it arrives, bends as it enters glass, splits into colours inside a prism and gathers at the focal point of a lens.

Twenty-four puzzles. Four chapters take you from a first bounce off a mirror to lenses, colour and real instruments. Pick a piece from the tray, set it on the table and grab the ring around it. It turns with soft clicks and settles firmly at 45°. Pinch a lens to make it stronger or weaker. When the light holds on a target, the target fills up and glows, and the level is done.

Colour changes the rules. A red target accepts only pure red, so you filter, split and recombine white light until every target gets exactly the colour it asks for. Stuck? A hint points the way, and a short note explains the physics behind it.

An open bench. No goals, no limits: place light sources, mirrors, beam splitters, prisms, filters and walls anywhere you like. Run a finger along the beam to read the angle at every turn. Save the setups you are proud of and come back to them later.

Five instruments to tune by hand. Slide a candle along a lens and see the image grow, shrink and flip as the focal length changes. Line up two mirrors to look over a wall like a submarine. Bring a telescope into sharp focus. Tilt your phone to turn a kaleidoscope, and shake it for new beads. Pinch the pinhole of a camera obscura and find the balance between a sharp picture and a bright one.

Then build it for real. Print a cardboard periscope or a pinhole camera obscura at true scale. Enter the size of your mirror and the template redraws itself to fit. Tick off each step as you cut, fold and glue, and look over the garden fence with something you made yourself.

Your progress fills a small map of glowing days, so you can see how far the light has travelled with you.

For curious kids, parents looking for a smart screen-time choice, teachers who want optics to click in class, and anyone who loves a clean puzzle with a beautiful idea behind it.

Switch on the light and see where it takes you.