js13k demo
A free puzzle game — play it in your browser, no install. A physics-based puzzle game built with vanilla JavaScript and Canvas 2D. Guide electrons into atomic orbitals following the Aufbau principle while staying under the 13KB JS13K size limit.
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Open the live demo Source on GitHubFrom the README
A physics puzzle game where you guide electrons into atomic orbitals using electromagnetic attraction and repulsion. Built for JS13K competition practice with vanilla JavaScript and Canvas 2D.
This started as warm-up for JS13K 2025. I wanted to practice building under extreme size constraints while finishing something polished.
The concept came from experiments with attraction/repulsion physics. Blue s-electrons follow your cursor, orange p-electrons run from it. Fill orbitals following real atomic structure rules. Hit an occupied orbital twice and the electron gets ejected.
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