beamline
A free puzzle game — play it in your browser, no install. A twelve-level light routing puzzle. Pure testable engine, exhaustively verified level set, DOM board with a canvas beam overlay so it is keyboard and screen-reader playable.
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Controls: Fully keyboard playable. The board is one tab stop and the arrow keys move
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Open the live demo Source on GitHubFrom the README
A twenty-level puzzle about routing coloured light. Place mirrors and splitters so every sensor receives exactly the colour it asks for, using no more pieces than you are given.
No build step, no framework, no account and no analytics. Open the folder in any static server and it runs.
The first version passed 64 engine tests and drew every beam in the wrong place. The canvas that draws the light was never given a size, so the browser left it at its default 300 by 150 pixels and every beam was squeezed into the top-left corner of the board.
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