Turn mirrors so one beam lights both receivers together. Change the mirror orientations to work out the route through the room. Everyone gets the same daily puzzle, refreshed at midnight UTC. Today's puzzle is free in your browser with no account required; archive access is optional and paid. Built with substantial AI assistance for code and text, with human direction. Puzzles use a deterministic engine, with no runtime generative AI.

Submitted by BillieM on Oct 20, 2026

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