Small beams, shared ideas.

This browser edition adapts the beam propagation, T-prism splitting and color recipes of Gleam Glass by Homer Dilpleu, released under the MIT License. Source commit: b4990dffb112b0468b97708649f3adf4245c6414.

New for this edition: twelve authored puzzles, simultaneous-jewel completion, bounded beam simulation, a complete ending, accessible keyboard and touch controls, undo, hints and local progress. Color recipes are game rules, rather than a physical light model.

The stained-glass conservatory illustration was created with OpenAI’s GPT image generation tool and optimized to a local WebP. Its color returns as you complete the windows. All gameplay, artwork and sound run locally in your browser. Progress stays on this device. No sign-in or network service is needed to play.

Open-source license

MIT License

Copyright (c) 2026 Homer Dilpleu

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
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