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…
Mini Metroidvania in 13KB of JavaScript launched on September 13, 2022 with 238 votes, #102 of 3,464 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 4 years on.
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
A mini Metroidvania about a demon regaining his powers.
Your seat on the Infernal Throne has been overruled. The Demon King has banished you to the depths of Hell and stripped you of your infernal Aspects. Navigate the Underworld and its dangers while searching for a way to regain your strength. [Left Analog] or [DPad] to move [South Button] to jump [West Button] to attack [East Button] or [Left Trigger] Use Aspect 1 (once learned) [North Button] Use Aspect 2 (once learned) [Left Bumper] Show map More information Status Released Platforms HTML5 Rating Rated 4.7 out of 5 stars (23 total ratings ) Author AriNeonShark Genre Action , Platformer Tags Metroidvania , Short Comments Log in with itch.io to leave a comment. This was a blast! I really…from arineonshark.itch.io
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…
Does a similar job
all alternatives →- IMI made a web game called Almost Pong2022 · lessmilk.com · ▲1,135
Hi HN! I made many small web games in the past with Unity or Phaser. But this time I wanted to make something completely on my own. So I coded a basic game framework in plain JavaScript, and used it to make Almost Pong. This was a really fun project that taught me a lot about JavaScript, and I plan to make more minimalist games with this framework. Interesting fact: Almost Pong doesn't load any assets, all sprites and sounds are generated with code. Happy to answer questions, and please let me know if you have any feedback on the game. Thanks!
I made a Doom-like game fit inside a QR code2025 · github.com · ▲531I sometimes pick up random projects just because I can, this was one of those times. I made it as a week long project a while back this year but never shared here, so thought to go for it haha. I created a game inspired by Doom and the backrooms called The Backdooms under 2.4kb in minified html. (for reference, this entire post would be around 1.8kB haha) I had to use a not popular way of using GZip with Zlib headers (had to write my own script for compressing it, also in the repo) to eventually convert it a size 40 QR code that works right in your browser using Decompressionstream API. This…
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The game is vanilla JS, with SVG for graphics. Written for the js13kGames coding competition. Notes on the game design: https://mvasilkov.animuchan.net/king-thirteen
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Tiny – A 2D Game Engine in Kotlin Working with Lua2023 · minigdx.github.io · ▲100I created a small 2D game engine named Tiny. The engine was created using Kotlin Multiplatform and can run on a JVM and JS. Funny things: Games can be created using the programming language Lua. Tiny is designed to help you create and test your ideas quickly and effectively. Not only can you run your games on your desktop computer, but you can also export them for the web, making it easy to share your creations with others. You can create games easily with the hot reload, small API and Lua, which is very easy to learn. If you want to test a game idea, to try to create your first game or just…
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Source: Show HN post ↗ · launch text quoted in part
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