Kitao releases Playload, a 3KB game engine built for sharing on X
The open-source engine caps a game's compressed JavaScript at 3KB so its code fits in a URL that X shortens to 23 characters.
Developer Takashi Kitao released Playload, an open-source game engine for JavaScript, on GitHub on October 21, 2026. According to Automaton Media, the engine limits a game's compressed code to 3KB, a ceiling chosen so the whole game can travel as a shared link.
Playload runs in the browser, which means developers can write a game and distribute it as a URL on X. The 3KB limit was set because such a link is shortened by the platform to 23 characters.
The engine renders at 160x144 pixels, a CRT-style display, with support for up to 8 colors. Unicode emoji can be used as 8x8 pixel art sprites, and games can play background music.
Sample programs shipped with the engine include a Space Invaders-style shooter, a jump action game and a Lights Out-style puzzle.
From Konami tools to small-scale engines
Kitao previously worked at Konami as main programmer and lead engineer on the Zone of the Enders series and on development tools for Metal Gear Solid. In 2018 he released Pyxel, a retro game engine for Python. Constrained-size projects have a longer history: a past contest challenged developers to fit a game within 1.44MB, the capacity of a 3.5-inch floppy disk, while the js13kGames game jam asks for games under 13KB when zipped.
Quick answers
What is Playload?
It is an open-source JavaScript game engine released by Takashi Kitao on GitHub on October 21, 2026, which limits a game's compressed code to 3KB.
Why is Playload limited to 3KB?
The limit was chosen so a game's code fits within a URL that X shortens to 23 characters, allowing games to be shared as links on the platform.
What can Playload games display?
Games run in the browser at 160x144 pixels with up to 8 colors, can use Unicode emoji as 8x8 pixel art sprites, and can play background music.