Pinhole: Light Beam Puzzle

Apptiary

Contains adsIn-app purchases

About this game

Pinhole is a quiet deduction puzzle. Atoms hide inside a closed box and you never see them. Send a beam of light through a hole in the edge and read what comes back: it leaves from another hole, it never comes back at all, or it turns around and returns the way it came. Mark every atom in as few probes as you can.

• Daily puzzle: one shared box a day, build your streak
• Hand-graded level map, from gentle 5x5 boxes to dense late ones
• Weekly challenge: five boxes, the same for every player
• Create & share your own box with a short code, no account needed
• Colour-blind friendly: numbered beam pairs, four palettes, high contrast
• Dark mode, offline play, no sign-up, family friendly

Free to play. Optional rewarded hints and a one-time Supporter unlock that removes ads. No accounts, progress stays on your device.