Dev tools · September 13, 2022
Mini Metroidvania in 13KB of JavaScript
As part of the annual JS13K games challenge, I've put together a pretty large (but small-in-code) Metroidvania game that fits in just 13KB of compressed Javascript. The source is available here: https://github.com/arikwex/infernal-sigil NOTE: the current head of the main branch is at 13.6KB due to quality of life patches. The legit 13KB version is tagged in github. Useful hacks: - Using Roadroller (https://github.com/lifthrasiir/roadroller) for compression - Compressing the map data as grayscale PNG paired with some code generation. - Using procedural…
In plain words
Mini Metroidvania in 13KB of JavaScript is a full Metroidvania game built for the JS13K games challenge, compressed to fit within 13 kilobytes. The game features exploration, procedurally generated music, and an embedded game engine, all written in compressed JavaScript. It is designed for developers interested in extreme code optimization and game compression techniques, demonstrating practical approaches like PNG-based map compression, procedural animation, and advanced minification strategies.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
As part of the annual JS13K games challenge, I've put together a pretty large (but small-in-code) Metroidvania game that fits in just 13KB of compressed Javascript. The source is available here: https://github.com/arikwex/infernal-sigil NOTE: the current head of the main branch is at 13.6KB due to quality of life patches. The legit 13KB version is tagged in github. Useful hacks: - Using Roadroller (https://github.com/lifthrasiir/roadroller) for compression - Compressing the map data as grayscale PNG paired with some code generation. - Using procedural animation for all characters. - Replacing string enum with numeric enums for compression. - Built a small game engine for object lifecycle and rendering. - Single function to generate unique procedural songs for different regions.
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